Form 10-Q - Quarterly report [Sections 13 or 15(d)]

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q


☒	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2024


☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 001-38452

MEREO BIOPHARMA GROUP PLC

(Exact name of Registrant as specified in its charter)


England and Wales		Not Applicable
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

One Cavendish Place, 4th Floor
London, W1G 0QF
United Kingdom		+44-333-023-7300
(Address of principal executive offices)		(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

    Title of each class

    Trading Symbol(s)

    Name of each exchange on which registered

    American Depositary Shares, each representing five ordinary shares, nominal value of £0.003 per share
 
Ordinary Shares, nominal value of £0.003 per share  

    MREO

    The Nasdaq Stock Market LLC 
 
The Nasdaq Stock Market LLC*

* Not for trading, but only in connection with the registration of American Depositary Shares representing such Ordinary Shares pursuant to the requirements of the U.S. Securities and Exchange Commission.

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days ☒ Yes  No

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). ☒ Yes  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.


Large accelerated filer 	Accelerated filer 	Non-accelerated filer ☒	Smaller reporting company ☒
			Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes ☒ No

As of August 12, 2024 the number of outstanding ordinary shares, par value £0.003 per share, of the registrant was 769,262,609.

Table of Contents


		Page

PART I

Item 1.	Financial Statements	2

Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	19

Item 3.	Quantitative and Qualitative Disclosures About Market Risk	28

Item 4.	Controls and Procedures	28

PART II

Item1.	Legal Proceedings	29

Item 1A.	Risk Factors	29

Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	29

Item 3.	Defaults Upon Senior Securities	29

Item 4.	Mine Safety Disclosures	29

Item 5.	Other Information	29

Item 6.	Exhibits	30

Signatures		31

GENERAL INFORMATION

In this Quarterly Report on Form 10‑Q (“Quarterly Report”), “Mereo,” the “Group,” the “Company,” “we,” “us” and “our” refer to Mereo BioPharma Group plc and its consolidated subsidiaries, except where the context otherwise requires.

INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report contains forward-looking statements that involve risks and uncertainties, as well as assumptions that, if they never materialize or prove incorrect, could cause our results to differ materially from those expressed or implied by such forward-looking statements. We make such forward-looking statements pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and other federal securities laws. All statements other than statements of historical facts contained in this Quarterly Report are forward-looking statements. In some cases, you can identify forward-looking statements by words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect” or the negative of these words or other comparable terminology.

Any forward-looking statements in this Quarterly Report reflect our current views with respect to future events or to our future financial performance and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Factors that may cause actual results to differ materially from current expectations include, among other things, those listed under Part I, Item 1A. Risk Factors of our Annual Report on Form 10-K for the year ended December 31, 2023. Given these uncertainties, you should not place undue reliance on these forward-looking statements. Except as required by law, we assume no obligation to update or revise these forward-looking statements for any reason, even if new information becomes available in the future.

This Quarterly Report also contains estimates, projections and other information concerning our industry, our business, and the markets for certain diseases, including data regarding the estimated size of those markets, and the incidence and prevalence of certain medical conditions. Information that is based on estimates, forecasts, projections, market research or similar methodologies is inherently subject to uncertainties and actual events or circumstances may differ materially from events and circumstances reflected in this information. Unless otherwise expressly stated, we obtained this industry, business, market and other data from reports, research surveys, studies and similar data prepared by third parties, industry, medical and general publications, government data and similar sources.

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements.

MEREO BIOPHARMA GROUP PLC

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share data)

(Unaudited)


	June 30,			December 31,
	2024			2023
Assets
Current assets:
Cash and cash equivalents	$	87,431		$	57,421
Prepaid expenses and other current assets		4,489			5,156
Research and development incentives receivables		2,020			1,183
Total current assets		93,940			63,760
Property and equipment, net		338			405
Operating lease right-of-use assets, net		985			1,245
Intangible assets, net		866			1,089
Total assets	$	96,129		$	66,499

Liabilities
Current liabilities:
Accounts payable	$	2,700		$	2,346
Accrued expenses		3,721			5,467
Convertible loan notes – current		4,931			—
Operating lease liabilities – current		679			652
Other current liabilities		3,435			1,021
Total current liabilities		15,466			9,486
Convertible loan notes – non-current		—			4,394
Warrant liabilities – non-current		925			412
Operating lease liabilities – non-current		552			906
Other non-current liabilities		536			764
Total liabilities		17,479			15,962
Commitments and contingencies (Note 16)

Shareholders’ Equity
Ordinary shares, par value £0.003 per share; 768,821,274 shares issued at June 30, 2024 (December 31, 2023: 701,217,089).		3,032			2,775
Treasury shares		—			(1,230	)
Additional paid-in capital		534,732			486,107
Accumulated deficit		(440,836	)		(419,630	)
Accumulated other comprehensive loss		(18,278	)		(17,485	)
Total shareholders’ equity		78,650			50,537
Total liabilities and shareholders’ equity	$	96,129		$	66,499

The accompanying notes form an integral part of these condensed consolidated financial statements.

MEREO BIOPHARMA GROUP PLC

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In thousands, except share and per share amounts)

(Unaudited)


	Three Months Ended June 30,						Six Months Ended June 30,
	2024			2023			2024			2023
Revenue	$	—		$	9,000		$	—		$	9,000
Operating expenses:
Cost of revenue		—			(3,430	)		—			(3,083	)
Research and development		(4,946	)		(3,712	)		(8,939	)		(9,019	)
General and administrative		(7,868	)		(2,669	)		(13,777	)		(9,119	)
Loss from operations		(12,814	)		(811	)		(22,716	)		(12,221	)
Other income/(expenses)
Interest income		559			373			1,175			679
Interest expense		(331	)		(1,029	)		(641	)		(1,829	)
Changes in the fair value of financial instruments		(69	)		(102	)		(517	)		440
Foreign currency transaction gain/(loss), net		31			(803	)		644			(2,010	)
Other expenses, net		—			—			—			(6	)
Benefit from research and development tax credit		369			621			847			1,120
Net loss before income tax		(12,255	)		(1,751	)		(21,208	)		(13,827	)
Income tax benefit		—			—			—			—
Net loss	$	(12,255	)	$	(1,751	)	$	(21,208	)	$	(13,827	)

Loss per share – basic and diluted	$	(0.02	)	$	(0.00	)	$	(0.03	)	$	(0.02	)
Weighted average shares outstanding – basic and diluted		711,770,804			628,421,064			706,407,371			626,185,695

Net loss	$	(12,255	)	$	(1,751	)	$	(21,208	)	$	(13,827	)
Other comprehensive (loss)/income – Foreign currency translation adjustments, net of tax		5			1,400			(793	)		3,678
Total comprehensive loss	$	(12,250	)	$	(351	)	$	(22,001	)	$	(10,149	)

The accompanying notes form an integral part of these condensed consolidated financial statements.

MEREO BIOPHARMA GROUP PLC

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)


	Six Months Ended June 30,
	2024			2023
Cash flows from operating activities
Net loss	$	(21,208	)	$	(13,827	)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation		4,138			2,576
Depreciation		64			82
Amortization of intangible assets		216			171
Amortization of operating lease right-of-use assets		252			245
Change in fair value of warrants		517			(440	)
Non-cash interest expense		615			941
Non-cash interest income		-			(103	)
Foreign currency transaction (gain)/loss		(644	)		2,010
Changes in operating assets and liabilities:
Prepaid expenses and other current assets		644			(6,108	)
Research and development incentives receivable		(847	)		(1,924	)
Accounts payable		368			(1,494	)
Accrued expenses and other liabilities		306			1,149
Operating lease liabilities		(316	)		(280	)
Net cash used in operating activities		(15,895	)		(17,002	)

Cash flows from investing activities
Purchase of intangible assets		(699	)		(419	)
Net cash used in investing activities		(699	)		(419	)

Cash flows from financing activities
Proceeds from financing agreement with TAP		-			100
Proceeds from issuance of ordinary shares		47,000			-
Transaction costs on issuance of ordinary shares		(219	)		-
Transaction costs on convertible loan notes		-			(33	)
Net cash provided by financing activities		46,781			67

Increase/(decrease) in cash and cash equivalents		30,187			(17,354	)
Cash and cash equivalents at January 1		57,421			68,182
Effect of exchange rate changes		(177	)		2,139
Cash and cash equivalents at June 30	$	87,431		$	52,967

Supplemental disclosure
Cash paid for interest		10			863
Cash paid for income taxes		-			37
Cash paid for the amounts included in the measurement of operating lease liabilities		387			377
Supplemental disclosure of non-cash investing and finance activities
Issuance of ordinary shares - transaction costs not yet paid		804			-

The accompanying notes form an integral part of these condensed consolidated financial statements.

MEREO BIOPHARMA GROUP PLC

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY

(In thousands, except per share amounts)

(Unaudited)


	Ordinary shares				Treasury shares						Additional paid-in			Accumulated other comprehensive			Accumulated			Total shareholders’
	Shares		Cost		Shares			Cost			capital			(loss)/income			deficit			equity
Balance, December 31, 2023		701,217,089		2,775		923,400		$	(1,230	)	$	486,107		$	(17,485	)	$	(419,630	)	$	50,537
Net loss																		(8,951	)		(8,951	)
Foreign currency translation adjustments															(798	)					(798	)
Share-based compensation												2,050									2,050
Exercise of share options		132,345		-		(210,485	)		280			(280	)								—
Delivery of shares on vesting of restricted stock units						(712,915	)		950			(950	)								—
Balance, March 31, 2024		701,349,434		2,775		—			—			486,927			(18,283	)		(428,581	)	$	42,838
Net loss																		(12,255	)		(12,255	)
Foreign currency translation adjustments															5						5
Share-based compensation												2,088									2,088
Exercise of share options		800,890		4								(6	)								(2	)
Delivery of shares on vesting of performance based restricted stock units		4,014,450		15								(40	)								(25	)
Issuance of shares, net of discount		62,656,500		238								46,762									47,000
Transaction costs on issuance of shares												(999	)								(999	)
Balance, June 30, 2024		768,821,274		3,032		—			—			534,732			(18,278	)		(440,836	)		78,650

Balance, December 31, 2022		624,928,519		2,478		1,003,030			(1,335	)		476,521			(21,687	)		(404,575	)		51,402
Net loss																		(12,076	)		(12,076	)
Foreign currency translation adjustments															2,278						2,278
Extinguishment and reissuance of convertible loan note												1,161									1,161
Share-based compensation												1,635									1,635
Balance, March 31, 2023		624,928,519	$	2,478		1,003,030		$	(1,335	)	$	479,317		$	(19,409	)	$	(416,651	)	$	44,400
Net loss																		(1,751	)		(1,751	)
Foreign currency translation adjustments															1,400						1,400
Share-based compensation											943										943
Delivery of shares on vesting of restricted stock units		501,380	2																		2
Conversion of convertible loan note		17,774,895	67									(1,234	)					5,784			4,617
Issuance of warrants											54										54
Balance, June 30, 2023		643,204,794	$	2,547		1,003,030		$	(1,335	)	$	479,080			(18,009	)		(412,618	)		49,665

The accompanying notes form an integral part of these condensed consolidated financial statements.

MEREO BIOPHARMA GROUP PLC

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Nature of business

Mereo BioPharma Group plc (the “Company” or “Mereo”) is a United Kingdom (“U.K.”) based biopharmaceutical company focused on the development of innovative therapeutics for rare diseases. The Company has developed a portfolio of late-stage clinical product candidates, and its two rare disease product candidates are setrusumab for the treatment of osteogenesis imperfecta (“OI”) and alvelestat primarily for the treatment of severe alpha-1 antitrypsin deficiency-associated lung disease (“AATD-LD”).

The Company is a public limited company incorporated and domiciled in the U.K., and registered in England, with shares publicly traded on the Nasdaq Capital Market via American Depositary Shares (“ADSs”) under the ticker symbol “MREO”. The Company’s registered office is located at Fourth Floor, 1 Cavendish Place, London, W1G 0QF, United Kingdom.

2. Basis of presentation and summary of significant accounting policies

Basis of presentation

The condensed consolidated financial statements of the Company and its subsidiaries and other financial information included in this Quarterly Report are unaudited, have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and are presented in U.S. dollars. All significant intercompany accounts and transactions between the Company and its subsidiaries have been eliminated on consolidation.

The unaudited condensed consolidated financial statements presented in this Quarterly Report should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 27, 2024 (the “2023 Annual Report”). The condensed consolidated balance sheet as of December 31, 2023 was derived from audited consolidated financial statements included in the Company’s Annual Report but does not include all disclosures required by U.S. GAAP. The Company’s significant accounting policies are described in Note 2 to those consolidated financial statements.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted from these interim financial statements. However, these interim financial statements include all adjustments which are, in the opinion of management, necessary to fairly state the Company's financial position as of June 30, 2024, the results of operations for the three and six months ended June 30, 2024 and 2023 and cash flows for the six months ended June 30, 2024 and 2023. The interim results are not necessarily indicative of results to be expected for the full year.

Going concern

The Company is subject to risks common to companies in the biotechnology industry, including but not limited to, risks of delays in initiating or continuing research programs and clinical trials, risks of failure of preclinical studies and clinical trials, the need to obtain marketing approval for any drug product candidate that it may identify and develop, the need to successfully commercialize and gain market acceptance of its product candidates, if approved, dependence on key personnel and collaboration partners, protection of proprietary technology, compliance with government regulations, development by competitors of technological innovations, and the ability to secure additional capital to fund operations. Product candidates currently under development will require significant additional research and development efforts, including pre-clinical and clinical testing and regulatory approval prior to commercialization. Even if the Company’s research and development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales.

The Company has historically been loss making, anticipates that it will continue to incur losses for the foreseeable future, and had an accumulated deficit of $440.8 million as of June 30, 2024. The Company has funded these losses through a combination of public equity financings, private equity and debt financings and various license and collaboration agreements, and it expects it will continue to do so until such time as it can generate significant revenue from product sales, or other commercial revenues, if ever, or through licensing and/or collaboration agreements for its rare disease or oncology product candidates. Although the Company recently raised net proceeds of $47.0 million before issuance costs through an underwritten registered direct offering of its ADSs, there is no assurance that it will continue to be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all.

As of June 30, 2024, the Company had cash and cash equivalents of $87.4 million. The Company expects that its cash and cash equivalents as of June 30, 2024 will be sufficient to fund its operations and capital expenditure requirements for at least twelve months from the date of filing of this Quarterly Report on Form 10-Q.

Use of estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting periods. Significant estimates and assumptions reflected in the Company's unaudited condensed financial statements include, but are not limited to, revenue recognition on contracts with customers and convertible loan notes. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates.

3. Recent accounting pronouncements

There have been no recent accounting pronouncements, changes in accounting pronouncements or recently adopted accounting guidance other than those previously included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023, which was filed with the SEC on March 27, 2024, that are of significance or potential significance to the Company. The Company is continuing to evaluate the impact of the recently issued pronouncements that are effective in future periods that were discussed in its Annual Report on Form 10-K.

4. Fair value measurement

The Company’s financial instruments consist of cash and cash equivalents, accounts payable, certain accrued expenses, contingent consideration, warrant liability and convertible loan notes. The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses approximate their fair value due to the short-term nature of those financial instruments.

The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis and classified under the appropriate level of the fair value hierarchy:

         
        As of June 30, 2024

         
        Total

        Level 1

        Level 2

        Level 3

         
        ($'000)

        ($'000)

        ($'000)

        ($'000)

        Financial liabilities

Warrant liabilities

925

—

925

—


	As of December 31, 2023
	Total		Level 1		Level 2		Level 3
	($'000)		($'000)		($'000)		($'000)
Financial liabilities
Warrant liabilities		412		—		412		—
CVR liability		—		—		—		—

There were no transfers between Level 1 and Level 2 during the three and six months ended June 30, 2024.

Warrant liabilities

At June 30, 2024 and December 31, 2023, warrant liabilities solely related to those warrants outstanding to the former lenders of the Company as described in Note 11.

Contingent Value Rights Agreement Liability ("CVR liability")

In 2019, the Company acquired OncoMed and subsequently renamed it Mereo BioPharma 5, Inc. The Company made a provision for the estimated fair value of amounts payable to the former shareholders of Mereo BioPharma 5, Inc. under a Contingent Value Rights Agreement (“CVR”), established at the time of the acquisition of Mereo BioPharma 5, Inc. which was accounted for as a contingent consideration liability. The CVR expired on April 23, 2024 with no further amounts payable, therefore there were no CVR obligations as of June 30, 2024. As of December 31, 2023, the Company estimated the fair value of the liability for its obligations under the CVR to be $nil.

5. Prepaid expenses and other current assets

Prepaid expenses and other current assets consisted of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
VAT receivable	$	653	$	599
Prepaid research and development services		1,204		632
Insurance claim receivable		—		1,950
Employee taxes on PSU vesting to be remitted		1,602		—
Security deposits		475		615
Other prepaid expense and current assets		555		1,360
Total	$	4,489	$	5,156

In June 2024, ADSs were sold on behalf of certain employees upon vesting of PSUs to cover ensuing income tax and social security obligations. Proceeds of $1.6 million were owed to the Company by its broker at June 30, 2024 and received shortly thereafter. The Company used these funds to settle its liability (see Note 8) to remit these amounts to the relevant taxing authorities on the employees' behalf.

6. Property and equipment, net

Property and equipment, net consists of the following:


	June 30,			December 31,
	2024			2023
	($'000)			($'000)
Leasehold improvements	$	718		$	710
Office equipment		198			199
IT equipment		299			296
Property and equipment, at cost		1,215			1,205
Less: accumulated depreciation		(877	)		(800	)
Property and equipment, net	$	338		$	405

Depreciation expense was less than $0.1 million for both the three and six months ended June 30, 2024 and 2023.

7. Leases

In August 2015, the Company entered into a lease agreement under which it leased office space located on the fourth floor of One Cavendish Place, London, with a lease term ending in August 2025. In June 2021, the Company entered into a new lease agreement to lease additional office space located on the fifth floor of that building for a lease period ending in June 2026. At the same time, the Company entered into a revisionary lease to extend the term for the original fourth floor lease to be coterminous with the fifth floor, ending in June 2026.

The total lease expense included in the statements of operations and comprehensive loss was $0.2 million and $0.3 million in the three and six months ended June 30, 2024, respectively and $0.2 million and $0.3 million in the three and six months ended June 30, 2023, respectively. There were no material variable lease costs.


	As of June 30,
	2024			2023
Operating leases
Weighted-average remaining contractual lease term (years)		1.95			2.95
Weighted average discount rate		10.0	%		10.0	%


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	($'000)		($'000)		($'000)		($'000)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	193	$	191	$	387	$	377

The following table summarizes the maturities of the Company’s operating lease liabilities as of June 30, 2024:


	As of June 30, 2024
	($'000)
Maturity analysis of the operating lease liabilities for the years ending December 31,
2024	$	387
2025		771
2026		193
Total undiscounted payments		1,351
Less: Present value discount		(120	)
Lease liability	$	1,231
Lease liability – current	$	679
Lease liability – non-current	$	552

8. Other current liabilities

Other current liabilities consist of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
Social security and other taxes		695	$	280
Employee taxes on PSU vesting to be remitted		1,602		—
Deferred consideration liability		276		711
Equity issuance costs payable		804		—
Other current liabilities		58		30
Total		3,435	$	1,021

9. Accrued expenses

Accrued expenses consist of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
Accrued research and development costs	$	765	$	1,821
Accrued legal fees		468		266
Accrued bonus		1,120		1,624
Accrued audit fees		370		671
Accrued professional fees		223		338
Accrued local taxes	-			382
Other accrued expenses		775		365
Total	$	3,721	$	5,467

10. Convertible loan notes

Novartis Loan Note

On February 10, 2020, the Company entered into a convertible equity financing with Novartis Pharma (AG) (“Novartis”) under which Novartis purchased a £3.8 million ($5.2 million) convertible loan note (the “Novartis Loan Note”). The Novartis Loan Note is convertible at the discretion of the holder, at a fixed price of £0.265 per ordinary share and originally bore interest at 6% per annum with a maturity date of February 10, 2023. In connection with the Novartis Loan Note, the Company also issued 1,449,614 warrants which are exercisable until February 2025 at an exercise price of £0.265 per ordinary share. These warrants were recognized separately as equity instruments.

Effective February 10, 2023, the maturity date of the Novartis Loan Note was extended to February 10, 2025 and the interest rate amended to 9%. Interest accrued to the amendment date of $0.9 million was paid in cash, and additional warrants to purchase 2,000,000 ordinary shares were issued. These warrants were also recognized separately as equity instruments.

The amendments to the Novartis Loan Note were an extinguishment of the original instrument and the issuance of a new one. Accordingly, on the extinguishment date, the carrying value of $5.5 million was derecognized. At the same time, a new liability of $3.4 million was recognized, which represents the portion of the consideration of the new arrangement allocated to the liability component of the new Novartis Loan Note on the basis of its relative fair value, net of fees. The remaining amount was allocated between the $0.9 million of interest paid in cash and the residual $1.2 million which was recorded in additional paid-in capital to reflect the relative fair value of the warrants and the conversion option embedded in the new Novartis Loan Note. No extinguishment gain or loss was recognized. The Company recognized interest expense of $0.3 million and $0.6 million in relation to the Novartis Loan Note in the unaudited condensed consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2024, respectively and $0.2 million and $0.5 million in the three and six months ended June 30, 2023 respectively. The effective interest rate applied to the liability portion of the Novartis Loan Note in the three and six months ended June 30, 2024 was 27.8% (2023: 27.8% after the amendments and 37.4% before).

As of June 30, 2024 and December 31, 2023, the net carrying amount of the liability component of the convertible debt instrument was $4.9 million and $4.4 million, respectively and the fair value was $3.3 million and $3.1 million, respectively.

Private Placement Loan Notes

The Private Placement Loan Notes were issued in 2020 as part of a $70.0 million private placement transaction which also included the issuance of ordinary shares and warrants. The Private Placement Loan Notes were originally convertible at a fixed price of £0.174 per ordinary share, bore interest at a rate of 6% per annum and had a maturity date of June 3, 2023.

In May 2023, the maturity date of the Private Placement Loan Notes was extended to August 3, 2023, with all other terms remaining unchanged. This extension was a modification and the carrying value of the liability component was adjusted to the present value of the modified cash flows discounted at the original effective interest rate, net of identifiable transaction costs. The carrying value was also reduced by $0.6 million with a corresponding adjustment to additional paid-in capital to reflect the increase in the fair value of the embedded conversion option.

In 2023, the Company received conversion notices and subsequently issued and allotted 17,774,895 ordinary shares in the three months ended June 30, 2023 and 9,645,200 ordinary shares in the three months ended September 30, 2023, both at a price of £0.174 per share on non-cash conversion of Private Placement Loan Notes with an aggregate principal amount of $4.6 million. In 2023, the Company also paid $3.2 million to fully settle the outstanding principal and accrued interest balance.

The Company recognized $0.7 million and $1.1 million of interest expense in the three and six months ended June 30, 2023 respectively. The effective interest rate applied to the liability portion of the Private Placement Loan Notes in 2023 after the amendments was 27.1% while the effective interest rate applied in 2023 before the amendments was 25.1%.

11. Warrant liability


	Warrant liabilities
	2024			2023
	($'000)			($'000)
At January 1		412			643
Fair value changes during the period		448			(542	)
Foreign exchange		(5	)		4
At March 31		855			105
Fair value changes during the period		69			102
Foreign exchange		1			3
At June 30		925			210

Warrant liability – private placement

As a part of a private placement transaction on June 3, 2020, the participating investors received conditional warrants entitling them to subscribe for an aggregate of 161,048,366 ordinary shares in the Company at an exercise price of £0.348 per warrant and were exercisable until June 2023 when they expired. The warrants were classified as liabilities as the Company did not have an unconditional right to avoid redeeming the instruments for cash.

Warrant liability – bank loan

As of June 30, 2024, the former lenders of the Company have warrants outstanding to purchase a total of 1,243,908 ordinary shares at an exercise price of £2.95 per share, exercisable until August 2027 and a total of 1,243,908 ordinary shares at an exercise price of $0.4144 per share, exercisable on dates between August 2027 and October 2028. There were no warrants exercised during either the three and six months ended June 30, 2024 or 2023.

Total outstanding warrants

As of June 30, 2024 and December 31, 2023, a total of 2,487,816 warrants over the same number of ordinary shares are outstanding. These warrants outstanding are equivalent to 0.3% of the issued ordinary share capital of the Company as of June 30, 2024 and 0.4% as of December 31, 2023.

The following table lists the weighted average inputs to the models used to calculate the fair value of warrants:


	June 30,			December 31,
	2024			2023
Expected volatility (%)		95			102
Risk-free interest rate (%)		4.05			3.36
Expected life of warrants (years)		3.7			5.2
Market price of ADS ($)		3.60			2.31
Model used	Black-Scholes		Black-Scholes

12. Shareholders’ Equity

Common Shares


	Number of ordinary shares		Cost ($'000)
At January 1, 2023 and March 31, 2023		624,928,519		2,478
Vesting of DRSUs		501,380		2
Conversion of convertible loan notes		17,774,895		67
At June 30, 2023		643,204,794		2,547

At January 1, 2024		701,217,089		2,775
Exercise of share options		132,345		—
At March 31, 2024		701,349,434		2,775
Exercise of share options		800,890		4
Vesting of PSUs		4,014,450		15
Issuance of shares		62,656,500		238
At June 30, 2024		768,821,274		3,032

During the three months ended March 31, 2024, the exercise of employee share options and the vesting of restricted stock units ("RSUs") were satisfied by delivering shares from the Employee Benefit Trust until all of the shares in the Employee Benefit Trust were used and it was terminated. Subsequently, 132,345 ordinary shares were issued to satisfy employee share option exercises.

During the three months ended June 30, 2024, 4,815,340 ordinary shares were issued due to the exercise of employee share options and the vesting of PSUs.

Additionally, on June 17, 2024, the Company issued 12,531,300 ADSs representing 62,656,500 ordinary shares through an underwritten registered direct offering priced at $3.99 per ADS. The Company raised aggregate gross proceeds of $50.0 million, or $47.0 million after underwriting discounts of $3.0 million. The Company also incurred other issuance costs of $1.0 million related to the offering.

13. Revenue and cost of revenue

There was no revenue earned, or cost of revenue recognized in the three and six months ended June 30, 2024.

In the three and six months ended June 2023, the Company recognized milestone proceeds of $9.0 million as revenue under the license and collaboration agreement with Ultragenyx for setrusumab following achievement of a development milestone. As a

consequence of this milestone received, and in accordance with the terms of the 2015 asset purchase agreement with Novartis which requires payment of a percentage of the proceeds received, subject to certain deductions, the Company also recognized cost of revenue of $3.4 million for the three months ended June 30, 2023 and $3.1 million for the six months ended June 30, 2023.

14. Share based compensation

The Company currently grants equity awards under the Mereo 2019 Equity Incentive Plan (the “2019 EIP”) and the 2019 Non-Employee Equity Incentive Plan (the “2019 NED EIP”). There are also still outstanding awards under two previous plans, the 2015 Plan and the Mereo Share Option Plan (together the “Previous Share Option Plans”), however no awards have been granted under these plans since 2016 and no further grants are envisioned.

The total number of ADSs available for issue under the 2019 EIP and 2019 NED EIP was 9.0 million as of June 30, 2024.

The expense for share-based compensation arises solely in respect of awards made under these two active plans as follows:


	Three Months Ended June 30,					Six Months Ended June 30,
		2024		2023		2024		2023
		($'000)		($'000)		($'000)		($'000)
2019 EIP			1,568		684		3,027		1,889
2019 NED EIP			520		259		1,111		687
Total			2,088		943		4,138		2,576

As of June 30, 2024, the total unrecognized compensation cost related to outstanding share awards was $7.3 million, which the Company expects to recognize over a weighted-average period of 1.7 years.

2019 EIP

The Company has awarded the following instruments under the 2019 EIP:

Market Value Options (“Options”)

A summary of the Company’s Option activity and related information under the 2019 EIP for the six months ended June 30, 2024 is as follows; all outstanding Options are expected to vest:


	Number of options (ADSs)			Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		9,595,161			1.63		1.41		8,133
Granted		2,477,404			3.35		2.60		—
Forfeited		(47,288	)		2.01		1.69		69
Exercised		(415,568	)		1.51		1.27		760
Expired		(5,000	)		3.32		2.93		—
At June 30, 2024		11,604,709			2.00		1.66		18,975
Vested		4,957,767			1.95		1.66		8,566
Unvested		6,646,942			2.03		1.67		10,409

At December 31, 2023, 6,169,952 Options with a weighted average grant date fair value of $1.13 were unvested. The weighted average per share fair value of options vesting during the six months ended June 30, 2024 and 2023 was $1.14 and $1.51 respectively.

The weighted average contractual life of Options outstanding at June 30, 2024 and December 31, 2023 was 8.1 years and 8.0 years respectively. For vested Options at June 30, 2024 and December 31, 2023 it was 7.2 years and 6.6 years respectively.

Where presented, the aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the quoted market price of the Company’s ADSs for the Options that were in-the-money.

The fair value of each Option is estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:


	Six Months Ended June 30,
	2024			2023
Market value of ADSs ($)	$	3.35		$	1.01
Risk-free interest rate (%)		4.02	%		3.43	%
Expected life (years)		6.25			10.00
Expected volatility (%)		90.78	%		98.06	%
Expected dividends		0.00	%		0.00	%

The expected volatility assumption is calculated by reference to the historical volatility of an appropriate peer group of companies for a period equal to the expected term of the Option. The grant date fair value is recognized over the requisite service period using the accelerated graded-vesting attribution method.

Restricted Stock Units (“RSUs”)

RSUs were first awarded in 2023 and each RSU entitles the holder to a conditional right to receive an ADS at no cost upon the completion of the applicable vesting period. RSUs granted under the EIP vest over three years with one-third of the awards vesting on the first anniversary of the grant date and the remainder vesting in four equal six-monthly installments thereafter. Upon vesting of the RSUs, the Company issues the requisite ADSs, a portion of which are sold to satisfy the resulting withholding tax obligations, and the remaining ADSs are delivered to the holder. RSUs have a maximum contractual life of 3.0 years.

A summary of the Company’s RSU activity and related information under the 2019 EIP is as follows. As of June 30, 2024 all outstanding RSUs are expected to vest:


	Number of RSUs (ADSs)			Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		489,225			1.04		1,130
Granted		204,914			3.36		—
Vested		(142,583	)		1.01		480
Forfeited		(23,533	)		1.36		—
At June 30, 2024		528,023			1.93		1,901

At June 30, 2024, the weighted average remaining period of RSUs outstanding was 2.8 years.

Where presented, the aggregate intrinsic value is calculated as the quoted market price of the Company’s ADSs. The fair value of each RSU was calculated by reference to the value of the shares awarded. The grant date fair value is recognized over the vesting period using the accelerated graded-vesting attribution method.

Performance Based Restricted Stock Units (“PSUs”)

PSUs were first awarded in 2023 and each PSU entitles the holder to a conditional right to receive an ADS at no cost upon satisfaction of four escalating ADS price performance targets over a two year performance period following the date of grant. A summary of the Company’s PSU activity and related information under the 2019 EIP for the six months ended June 30, 2024 is as follows:


	Number of PSUs (ADSs)			Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,338,150			0.61		3,091
Granted		—			—		—
Forfeited		—			—		—
Vested		(802,890	)		0.65		2,798
At June 30, 2024		535,260			0.54		1,927

At June 30, 2024, the weighted average contractual life of PSUs outstanding was 0.6 years.

The grant date fair value is recognized over the expected life using the straight-line attribution method.

2019 NED EIP

The Company has awarded the following instruments under the 2019 NED EIP:

Options

Options permit the recipient to purchase ADSs at an exercise price equal to the market price of the underlying ADSs on the date of grant. Options issued under the 2019 NED EIP have a contractual term of 10 years and vest in equal monthly installments over one year. There are no performance conditions. A summary of the Company’s Option activity and related information under the 2019 NED EIP for the six months ended June 30, 2024 is as follows; all outstanding Options are expected to vest:


	Number of options (ADSs)		Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,355,087		1.66		1.43		1,166
Granted		360,000		3.87		2.83		—
At June 30, 2024		1,715,087		2.12		1.72		2,700
Vested		1,475,087		1.84		1.54		2,700
Unvested		240,000		3.87		2.83		—

At December 31, 2023, 73,336 Options with a weighted average grant date fair value of $0.84 were unnvested. The weighted average per share fair value of options vesting during the six months ended June 30, 2024 and 2023 was $2.08 and $0.90 respectively.

The weighted average contractual life of Options outstanding at June 30, 2024 and December 31, 2023 was 7.9 years and 8.0 years respectively. For vested Options at June 30, 2024 and December 31, 2023 it was 7.7 years and 7.9 years respectively.

The fair value of each Option is estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:


	Six Months Ended June 30,
	2024			2023
Market value of ADSs ($)		3.87			0.94
Risk-free interest rate (%)		4.08	%		3.36	%
Expected life (years)		5.25			10.00
Expected volatility (%)		90.67	%		97.94	%
Expected dividends		—			—

The expected volatility assumption is calculated by reference to the historical volatility of an appropriate peer group of companies for a period equal to the expected term of the Option. The grant date fair value is recognized over the vesting period using the accelerated graded-vesting attribution method.

Deferred Restricted Stock Units (“DRSUs”)

Non-executive directors may voluntarily elect to convert their annual cash fees for services on the board of directors and DRSUs were granted to NEDs who made such elections. The number of DRSUs granted is determined by dividing the amount of the annual cash compensation by the average closing trading price of the Company's ADSs over the most recent 30 trading days as of the date of grant. Each DRSU entitles the holder to receive an ADS at no cost upon the completion of the vesting period. DRSUs granted under the 2019 NED EIP vest in substantially equal monthly installments over the plan year. Payment of DRSUs in ADSs will generally be 180 days following separation of service but have no specified contractual term.

A summary of the Company’s DRSU activity and related information under the 2019 NED EIP for the six months ended June 30, 2024 is as follows; all outstanding DRSUs are expected to vest:


	Number of DRSUs (ADSs)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		729,982		1.01		1,686
Granted		125,393		3.87		485
Forfeited		—		—		—
At June 30, 2024		855,375		1.43		3,079
Vested		771,778		1.17		2,778
Unvested		83,597		3.87		301

Where presented, the aggregate intrinsic value is calculated as the quoted market price of the Company’s ADSs. The fair value of each DRSU was calculated by reference to the value of the shares awarded. The grant date fair value is recognized over the vesting period using the accelerated graded-vesting attribution method.

Previous Share Option Plans

Mereo previously granted options to employees under two separate plans, the Mereo BioPharma Group Limited Share Option Plan (the “2015 Plan”) and the Mereo Share Option Plan (the “Share Option Plan”). No awards have been granted under either of these plans since 2017 and following the introduction of the 2019 EIP and the 2019 NED EIP, no further awards are envisioned.

All awards made under these plans became fully vested, with all compensation cost fully recognized, before December 31, 2021. A summary of the awards still outstanding under these plans is as follows:


	Number of options (ADSs)			Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,572,358			9.22		8.19		—
Expired		(152,491	)		—		—		—
At June 30, 2024		1,419,867			9.24		9.05		—

The weighted average contractual life of Options outstanding and vested at June 30, 2024 and December 31, 2023 was 1.3 years and 1.8 years respectively.

15. Loss per share

Basic loss per share is calculated by dividing the loss attributable for the year to ordinary equity holders of the Company by the weighted average number of ordinary shares outstanding during the year. Diluted loss per share is based on dividing the loss attributable for the year, adjusted for the effect of dilutive ordinary shares, by ordinary share equivalents, which includes the weighted average number of ordinary shares outstanding and the effect of dilutive ordinary share equivalents.


	Three Months Ended June 30,						Six Months Ended June 30,
	2024			2023			2024			2023
	($'000, except share and per share amounts)			($'000, except share and per share amounts)			($'000, except share and per share amounts)			($'000, except share and per share amounts)
Net loss	$	(12,255	)	$	(1,751	)	$	(21,208	)	$	(13,827	)
Net loss per share - basic and diluted	$	(0.02	)	$	(0.00	)	$	(0.03	)	$	(0.02	)
Weighted-average number of shares used in computing net loss per share - basic and diluted		711,770,804			628,421,064			706,407,371			626,185,695

The Company’s potentially dilutive securities have been excluded from the computation of diluted net loss per share as the effect for the three and six months ended June 30, 2024 and 2023 would be to reduce the net loss per share. Therefore, the weighted average number of ordinary shares outstanding used to calculate both basic and diluted net loss per share is the same.

The Company excluded the following potentially dilutive ordinary shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share for the periods indicated because including them would have had an anti-dilutive effect:


	Six Months Ended June 30,
	2024		2023
Options		73,698,315		64,289,090
RSUs		2,640,115		2,738,750
PSUs		2,676,300		6,690,750
DRSUs		4,276,875		3,637,905
Convertible loan notes – Novartis		16,308,364		15,000,137
Convertible loan notes – private placement		-		24,279,659
Warrants to purchase ordinary shares		7,539,129		7,539,129
AstraZeneca milestones potentially payable in equity		1,349,692		1,349,692

16. Commitments and contingencies

Indemnification agreements

In the normal course of business, the Company enters into contracts and agreements that contain a variety of representations and warranties and provide for general indemnification. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations. However, the Company may record charges in the future as a result of these indemnification obligations. In accordance with the Articles of Association in force on June 30, 2024, the Company has indemnification obligations to its officers and directors for certain events or occurrences, subject to certain limits, while they are serving at the Company’s request in such capacity. There have been no claims to date, and the Company has director and officer insurance that may enable it to recover a portion of any amounts paid for future potential claims.

Novartis Asset Purchase agreements

The Company issued to Novartis loan notes and agreed to make future payments to Novartis comprising amounts equal to ascending specified percentages of tiered annual worldwide net sales (beginning at high single digits and reaching into double digits at higher sales) of products that include the assets acquired. The levels of ascending percentages of tiered annual worldwide net sales are stipulated under the respective Purchase Agreements.

The Company further agreed that in the event it transfers, licenses, assigns or leases all or substantially all of its assets, it will pay Novartis a percentage of the proceeds of such transaction. The payment of a percentage of proceeds is not payable with respect to any transaction involving equity interests of the Company, a merger or consolidation of the Company, or a sale of any assets of the Company.

License agreements

In October 2017, the Company entered into an exclusive license and option agreement (“the License Agreement”), to obtain from AstraZeneca an exclusive worldwide, sub-licensable license under AstraZeneca’s intellectual property rights relating to alvelestat, with an option to acquire such intellectual property rights following commencement of a pivotal trial and payment of related milestone payments (“the Option”), together with the acquisition of certain related assets. Upon entering into the License Agreement, the Company made a payment of $3.0 million and issued 490,798 ordinary shares to AstraZeneca, for an aggregate upfront payment equal to $5.0 million. In connection with certain development and regulatory milestones, the Company has agreed to make payments of up to $115.5 million in the aggregate and issue additional ordinary shares to AstraZeneca for licensed products containing alvelestat. In addition, the Company has agreed to make payments to AstraZeneca based on specified commercial milestones of the product. The Company has also agreed to pay a specified percentage of sub-licensing revenue to AstraZeneca and to make royalty payments to AstraZeneca equal to ascending specified percentages of tiered annual worldwide net sales by the Company of licensed products (subject to certain reductions), ranging from the high single digits to low double digits. Royalties will be payable on a licensed-product-by-licensed-product and country-by-country basis until the later of ten years after the first commercial sale of such licensed product in such country and expiration of the last patent covering such licensed product in such country that would be sufficient to prevent generic entry. The Company has agreed to use commercially reasonable efforts to develop and commercialize at least one licensed product.

The License Agreement will expire on the expiration of the last-to-expire royalty term with respect to all licensed products. Upon the expiration of the royalty term for a licensed product in a particular country, the licenses to the Company for such product in such country will become fully paid and irrevocable. Prior to exercise of the Option, if at all, the Company may terminate the License Agreement upon prior written notice. Either party may terminate the agreement upon prior written notice for the other party’s material breach that remains uncured for a specified period of time or insolvency.

Research and development activities

The Company enters into contracts in the normal course of business with contract research organizations (“CROs”), contract manufacturing organizations (“CMOs”) and other third parties to assist in the performance of research and development activities and other services and products for operating purposes. The contracts with CROs generally provide for termination on notice, and therefore, are cancellable contracts and not included herein. The Company has manufacturing commitments with CMOs of $2.4 million as of June 30, 2024.

Legal proceedings

From time to time, the Company may be a party to litigation or subject to claims incident to the ordinary course of business. The Company was not a party to any material litigation and did not have any material contingency reserves established for any liabilities as of June 30, 2024 and December 31, 2023.

17. Related party disclosures

In the three and six months ended June 30, 2024 and 2023, there were no reportable related party transactions.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our unaudited condensed consolidated financial statements and related notes appearing elsewhere in this Quarterly Report and the audited consolidated financial statements and notes thereto and management’s discussion and analysis of financial condition and results of operations for the year ended December 31, 2023, included in our Annual Report on Form 10-K that was filed with the SEC on March 27, 2024. Some of the information contained in this discussion and analysis or set forth elsewhere in this Quarterly Report, including information with respect to our plans and strategy for our business, includes forward-looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the “Risk Factors” section of our Annual Report on Form 10-K for the year ended December 31, 2023, our actual results could differ materially from the results described in, or implied by, these forward-looking statements.

Overview

We are a biopharmaceutical company focused on the development of innovative therapeutics for rare diseases. We have developed a portfolio of late-stage clinical product candidates. Our two rare disease product candidates are setrusumab for the treatment of osteogenesis imperfecta (OI) and alvelestat primarily for the treatment of severe alpha-1 antitrypsin deficiency-associated lung disease (AATD-LD). Setrusumab has received orphan designation for OI from the European Medicines Agency (EMA) and the U.S. Food and Drug Administration (FDA), PRIME designation from the EMA and has rare pediatric disease designation from the FDA. Alvelestat has received U.S. Orphan Drug Designation for the treatment of AATD and Fast Track designation from the FDA for the treatment of AATD-LD.

Our strategy is to selectively acquire and develop product candidates for rare diseases that have already received significant investment from large pharmaceutical and biotechnology companies and that have substantial pre-clinical, clinical and manufacturing data packages. Since our formation in March 2015, we have successfully executed on this strategy by acquiring six clinical-stage product candidates of which four were in rare diseases and oncology. Four of our six clinical-stage product candidates were acquired from large pharmaceutical companies and two were acquired in our merger with OncoMed Pharmaceuticals Inc in 2019. We have successfully completed large, randomized Phase 2 clinical trials for four of our product candidates and the Phase 1b portion of a Phase 1b/2 for a fifth product candidate.

Rare diseases represent an attractive development and, in some cases, commercialization opportunity for us since they typically have high unmet medical need and can utilize regulatory pathways that facilitate acceleration to approval and to the potential market. Development of products for rare diseases involves close collaboration with key opinion leaders and investigators, and close coordination with patient organizations. Rare disease patients are typically treated at a limited number of specialized sites which helps identification of the patient population and enables a small, targeted sales infrastructure to commercialize the products in key markets.

On June 11, 2024, we and our partner, Ultragenyx jointly announced positive 14-month results from the Phase 2 portion of the ongoing Phase 2/3 Orbit study (NCT05125809) demonstrating that, as of a May 24, 2024 data cut-off date, treatment with setrusumab (UX143) continued to significantly reduce incidence of fractures in patients with OI with at least 14 months of follow-up. Treatment with setrusumab also resulted in ongoing and meaningful improvements in lumbar spine bone mineral density (BMD) at month 12 without evidence of plateau.

The large reduction in annualized radiologically confirmed fracture rate previously reported in patients treated for a minimum of 6 months was sustained in patients treated for at least 14 months with a high degree of significance. The median annualized rate of radiologically confirmed fractures across all 24 patients in the 2 years prior to treatment was 0.72. Following a mean treatment duration period of 16 months, the median annualized fracture rate was reduced 67% to 0.00 (p=0.0014; n=24). The annualized fracture rate excluded morphometric vertebral fractures and fractures of the fingers, toes, skull, and face, consistent with the Phase 3 study primary efficacy endpoint.

On June 17, 2024, we issued 12,531,300 ADSs representing 62,656,500 ordinary shares through an underwritten registered direct offering priced at-the-market on June 14, 2024 at a price of $3.99 per ADS. We raised aggregate gross proceeds of $50.0 million, or $47.0 million after underwriting discounts of $3.0 million. We also incurred other issuance costs of $1.0 million.

Results of Operations

Comparison of Three Months Ended June 30, 2024 and 2023

The following table sets forth Mereo’s results of operations for the three months ended June 30, 2024 and 2023.


	Three months ended June 30,
	2024			2023			Change
	($'000)			($'000)			($'000)			%
Revenue		-			9,000			(9,000	)		(100	)%
Operating expenses:
Cost of revenue		-			(3,430	)		3,430			(100	)%
Research and development		(4,946	)		(3,712	)		(1,234	)		33	%
General and administrative		(7,868	)		(2,669	)		(5,199	)		195	%
Loss from operations		(12,814	)		(811	)		(12,003	)	*
Other income/(expenses)
Interest income		559			373			186			50	%
Interest expense		(331	)		(1,029	)		698			(68	)%
Changes in the fair value of financial instruments		(69	)		(102	)		33			(32	)%
Foreign currency transaction gain/(loss), net		31			(803	)		834			(104	)%
Benefit from research and development tax credit		369			621			(252	)		(41	)%
Net loss before income tax		(12,255	)		(1,751	)		(10,504	)	*
Income tax benefit		-			-			-			-
Net loss		(12,255	)		(1,751	)		(10,504	)	*
Other comprehensive income – Foreign currency translation adjustments, net of tax		5			1,400			(1,395	)	*
Total comprehensive loss		(12,250	)		(351	)		(11,899	)	*

* Percentage change not meaningful

Revenue

No revenue was recognized for the three months ended June 30, 2024. Revenue of $9.0 million for the three months ended June 30, 2023 comprised a one-time milestone payment of $9.0 million resulting from the achievement of a clinical milestone on setrusumab by Ultragenyx.

Cost of revenue

No cost of revenue was recognized for the three months ended June 30, 2024. Cost of revenue for the three months ended June 30, 2023 was $3.4 million and primarily represents amounts payable pursuant to our 2015 agreement with Novartis, under which the Company pays a percentage of proceeds resulting from milestone revenue received, subject to certain deductions, and other amounts on the achievement of clinical milestones.

Research and development (“R&D”) Expenses

The following table sets forth our R&D expenses by product development program for the three months ended June 30, 2024 and 2023.


	Three months ended June 30,
	2024		2023		Change
	($'000)		($'000)		($'000)			%
Setrusumab (BPS-804/UX143)		1,448		508		940			185	%
Alvelestat (MPH-966)		2,902		1,022		1,880			184	%
Etigilimab (MPH-313)		468		1,962		(1,494	)		(76	)%
Leflutrozole (BGS-649)		16		134		(118	)		(88	)%
Acumapimod (BCT-197)		19		39		(20	)		(51	)%
Other		93		47		46			98	%
Total R&D expenses		4,946		3,712		1,234			33	%

Total R&D expenses increased by $1.2 million, or 33%, from $3.7 million in the three months ended June 30, 2023 to $4.9 million in the three months ended June 30, 2024.

The increase was primarily due to increases of $1.9 million and $0.9 million of R&D expenses for alvelestat and setrusumab, respectively, partially offset by a $1.5 million reduction in R&D expenses for etigilimab.

The increase in the program expenses for alvelestat primarily relates to preparatory work for the Phase 3 study, including manufacturing and drug formulation activities, St. Georges Respiratory Questionnaire (SGRQ) validation activities and regulatory filings and interactions.

The increase in program expenses for setrusumab is driven by additional activities in Europe and resources for the input into development, regulatory and manufacturing plans with our partner, Ultragenyx, as the global development program is funded by Ultragenyx pursuant to our license and collaboration agreement.

The reduction in etigilimab expenses was primarily due to the winding down and completion during 2023 of the open label Phase 1b/2 basket study in combination with an anti-PD-1 in a range of tumor types.

General and administrative expenses

General and administrative expenses increased by $5.2 million, or 195%, from $2.7 million in the three months ended June 30, 2023 to $7.9 million in the three months ended June 30, 2024. The increase is primarily related to: (i) a $3.4 million reduction in expenses which was recognized in the three months ended June 30, 2023 for amounts from our depository to reimburse certain expenses incurred by us in respect of our ADR program, whereas in 2024, $1.7 million was received from our depository in the three months ended March 31, 2024; and (ii) pre-commercial activities to lay the foundation for the commercial launch of setrusumab in Europe, including those to support pricing and reimbursement by HTA authorities and payor decision-makers in Europe of $0.9 million.

Interest income and expense

Total interest income increased from $0.4 million in the three months ended June 30, 2023 to $0.6 million in the three months ended June 30, 2024. The increase was principally due to higher interest rates on short-term deposits.

Total interest expense decreased from $1.0 million in the three months ended June 30, 2023 to $0.3 million in the three months ended June 30, 2024. This decrease was principally due to the lower balance in the quarter of convertible loan notes as the private placement loan notes were fully converted and redeemed in August 2023.

Changes in the fair value of financial instruments

The total change in fair value of financial instruments for the three months ended June 30, 2024 was an unrealized loss of $0.1 million, compared to an unrealized loss of $0.1 million in the three months ended June 30, 2023. The unrealized loss in 2024 is principally due to the increase in the share price of the Company's ADSs while the unrealized gain in 2023 was due to the Private Placement warrants, which reduced in value as they neared expiration in June 2023.

Foreign currency transaction gain/(loss)

The net foreign exchange gain for the three months ended June 30, 2024 was less than $0.1 million compared to a loss of $0.8 million in for the three months ended June 30, 2023. This change primarily reflects the impact of a slight weakening in the value of U.S. dollars when translating U.S. dollar foreign currency balances into our functional currency of pound sterling in the three months ended June 30, 2024, compared to a greater strengthening of U.S. dollars in the three months ended June 30, 2023.

Benefit from research and development tax credit

The benefit from research and development tax credits was $0.4 million for the three months ended June 30, 2024 and $0.6 million for the three months ended June 30, 2023, which reflects a combination of a lower level of qualifying expenditure in 2024 and a reduction in the proportion of qualifying expenditure that can be reclaimed under the scheme rules. The tax credits represent eligible cash rebates paid or receivable from the tax authorities in the jurisdictions within which we operate for eligible types of research and development activities and associated expenditure (the “R&D tax credit”).

Other comprehensive income – Foreign currency translation adjustments

The foreign currency translation adjustment for the three months ended June 30, 2024 was a gain of less than $0.1 million, compared to a gain of $1.4 million for the three months ended June 30, 2023. The $1.4 million change primarily reflects the impact of the weakening of U.S. dollars when translating the net assets of the Company from its functional currency (pound sterling) into its presentational currency (U.S. dollars) which was fully offset by the change in the weighted average historical exchange rate used to translate the equity components.

Comparison of the Six Months Ended June 30, 2024 and 2023

The following table sets forth Mereo’s results of operations for the six months ended June 30, 2024 and 2023.


	Six months ended June 30,
	2024			2023			Change
	($'000)			($'000)			($'000)			%
Revenue		-			9,000			(9,000	)		(100	)%
Operating expenses:
Cost of revenue		-			(3,083	)		3,083			(100	)%
Research and development		(8,939	)		(9,019	)		80			(1	)%
General and administrative		(13,777	)		(9,119	)		(4,658	)		51	%
Loss from operations		(22,716	)		(12,221	)		(10,495	)		86	%
Other income/(expenses)
Interest income		1,175			679			496			73	%
Interest expense		(641	)		(1,829	)		1,188			(65	)%
Changes in the fair value of financial instruments		(517	)		440			(957	)		(218	)%
Foreign currency transaction gain/(loss), net		644			(2,010	)		2,654			(132	)%
Other expenses, net		-			(6	)		6			(100	)%
Benefit from research and development tax credit		847			1,120			(273	)		(24	)%
Net loss before income tax		(21,208	)		(13,827	)		(7,381	)		53	%
Income tax benefit		-			-			-
Net loss		(21,208	)		(13,827	)		(7,381	)		53	%
Other comprehensive (loss)/income – Foreign currency translation adjustments, net of tax		(793	)		3,678			(4,471	)		(122	)%
Total comprehensive loss		(22,001	)		(10,149	)		(11,852	)		117	%

Revenue

No revenue was recognized for the six months ended June 30, 2024. Revenue of $9.0 million for the six months ended June 30, 2023 comprised a one-time milestone payment of $9.0 million resulting from the achievement of a clinical milestone on setrusumab by Ultragenyx.

Cost of revenue

No cost of revenue was recognized for the six months ended June 30, 2024. Cost of revenue for the six months ended June 30, 2023 was $3.1 million and primarily represents amounts payable pursuant to our 2015 agreement with Novartis, under which the Company pays a percentage of proceeds resulting from milestone revenue received, subject to certain deductions, and other amounts on the achievement of clinical milestones.

Research and development (“R&D”) Expenses

The following table sets forth our R&D expenses by product development program for the six months ended June 30, 2024 and 2023.


	Six months ended June 30,
	2024		2023		Change
	($'000)		($'000)		($'000)			%
Setrusumab (BPS-804/UX143)		2,357		1,161		1,196			103	%
Alvelestat (MPH-966)		5,515		3,362		2,153			64	%
Etigilimab (MPH-313)		818		4,115		(3,297	)		(80	)%
Leflutrozole (BGS-649)		52		194		(142	)		(73	)%
Acumapimod (BCT-197)		27		43		(16	)		(37	)%
Other		170		144		26			18	%
Total R&D expenses		8,939		9,019		(80	)		(1	)%

Total R&D expenses decreased by $0.1 million, or 1%, from $9.0 million in the six months ended June 30, 2023 to $8.9 million in the three months ended June 30, 2024.

The decrease was primarily due to a $3.3 million reduction in R&D expenses for etigilimab, partially offset by increases of $2.2 million and $1.2 million of R&D expenses for alvelestat and setrusumab, respectively.

The increase in program expenses for setrusumab is driven by additional activities in Europe, and resources for the input into development, regulatory and manufacturing plans with our partner, Ultragenyx, as the global development program is funded by Ultragenyx pursuant to our license and collaboration agreement.

General and administrative expenses

General and administrative expenses increased by $4.7 million, or 51%, from $9.1 million in the six months ended June 30, 2023 to $13.8 million in the six months ended June 30, 2024.

The increase is primarily related to:

(i)

Pre-commercial activities to lay the foundation for the commercial launch of setrusumab in Europe, including those to support pricing and reimbursement by HTA authorities and payor decision-makers in Europe of $1.3 million.

(ii)

Net increases in other general and administrative expenses of approximately $1.7 million, including legal and professional fees in respect of compliance with the U.S. domestic reporting regime and employee-related costs.

(iii)

A reduction of $1.7 million in the amount received from our depository to reimburse certain expenses incurred by us in respect of our ADR program in the six months ended June 30, 2024 compared to the six months ended June 30, 2023.

Interest income and expense

Total interest income increased from $0.7 million in the six months ended June 30, 2023 to $1.2 million in the six months ended June 30, 2024. The increase was principally due to higher interest rates on short-term deposits.

Total interest expense decreased from $1.8 million in the six months ended June 30, 2023 to $0.6 million in the six months ended June 30, 2024. This decrease was principally due to the lower balance in the six months of convertible loan notes as the private placement loan notes were fully converted and redeemed in August 2023.

Changes in the fair value of financial instruments

The total change in fair value of financial instruments for the six months ended June 30, 2024 was an unrealized loss of $0.5 million, compared to an unrealized gain of $0.4 million in the six months ended June 30, 2023. The unrealized loss in 2024 is principally due to the increase in the share price of the Company's ADSs during the period, while the unrealized gain in 2023 was due to the Private Placement warrants, which reduced in value as they neared expiration in June 2023.

Foreign currency transaction gain/(loss)

The net foreign exchange gain for the six months ended June 30, 2024 was $0.6 million compared to a loss of $2.0 million in for the six months ended June 30, 2023. This change primarily reflects the impact of a slight weakening in the value of U.S. dollars when translating U.S. dollar foreign currency balances into into our functional currency of pound sterling in the six months ended June 30 2024 compared to a greater strengthening of U.S. dollars in the six months ended June 30, 2023.

Benefit from research and development tax credit

The benefit from research and development tax credits was $0.8 million for the six months ended June 30, 2024 compared to $1.1 million for the six months ended June 30, 2023, which reflects a combination of a lower level of qualifying expenditure in 2024 and a reduction in the proportion of qualifying expenditure that can be reclaimed under the scheme rules. The tax credits represent eligible cash rebates paid or receivable from the tax authorities in the jurisdictions within which we operate for eligible types of research and development activities and associated expenditure (the “R&D tax credit”).

Other comprehensive loss – Foreign currency translation adjustments

The foreign currency translation adjustment for the six months ended June 30, 2024 was a loss of $0.8 million compared to a gain of $3.7 million for the six months ended June 30, 2023. The $ 4.5 million change primarily reflects the impact of the strengthening of U.S. dollars when translating from the functional currency of the Company (pound sterling) into the presentational currency (U.S. dollars).

Liquidity and Capital Resources

Overview

Under the current business plan and cash flow forecasts, and in consideration of our ongoing research and development efforts and our general corporate funding requirements, we anticipate that our current on-hand cash resources will extend into 2027. However, we will need additional external funding to complete our development plans and potentially commercialize selected rare disease products. We plan to fund our operations through cash on hand and a combination of non-dilutive funding sources, public or private equity or debt financings or other sources.

We do not currently have any approved product candidates and as a result, have not generated any revenue from product sales. As a result, to date, we have financed our operations primarily through the issuances of our equity securities, convertible debt and warrants. These offerings have raised approximately $259 million, including through the $50.0 million underwritten registered direct offering in June 2024 and the $12.0 million “at-the-market” offering pursuant to our Open Market Sale Agreement with Jefferies LLC in July 2023 (all amounts are gross proceeds before fees and discounts).

We have also received payments under various license and collaboration agreements, including:

•

An upfront payment of $50.0 million under the license and collaboration agreement with Ultragenyx for setrusumab in 2021 and a further milestone payment of $9.0 million in July 2023.

•

An upfront payment of $4.0 million under the license and collaboration agreement with Feng Biosciences (formerly OncXerna) for navicixizumab in 2020 and a further milestone payment of $2.0 million in 2022.

•

An upfront payment of $1.0 million under the global license agreement with ReproNovo for leflutrozole in December 2023.

Contractual Obligations

As further described in our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on March 27, 2023, under “Item 1. Business—Material Agreements—Novartis Agreements” and “Item 1. Business—Material Agreements—Licensing Agreement with AstraZeneca,” under various agreements with Novartis and AstraZeneca, Mereo has agreed to make milestone payments and pay royalties on potential future commercial sales. The amount, timing, and likelihood of such payments are not known and will remain uncertain for the foreseeable future.

In addition, Mereo enters into contracts in the ordinary course of business with CROs, CMOs, and other vendors to assist in the performance of its research and development activities and other services and products for operating purposes. The contracts with CROs generally provide for termination on notice, and therefore are cancelable contracts. We have manufacturing commitments with CMOs of $2.4 million as of June 30, 2024.

Cash Flows

Comparison of The Six Months Ended June 30, 2024, and 2023

The table below summarizes our cash flows (used in) from operating, investing and financing activities for the six months ended June 30, 2024 and 2023.


	Six Months Ended June 30,
	2024			2023
	($'000)			($'000)
Net cash used in operating activities		(15,895	)		(17,002	)
Net cash used in investing activities		(699	)		(419	)
Net cash provided by financing activities		46,781			67
Effect of exchange rate changes		(177	)		2,139
Increase/(decrease) in cash and cash equivalents		30,010			(15,215	)

Operating Activities

Net cash used in operating activities for the six months ended June 30, 2024, was $15.9 million, a decrease of $1.1 million from $17.0 million in the six months ended June 30, 2023. The decrease was primarily driven by $2.0 million received from a claim on our Directors and Officers insurance policy to reimburse us for certain legal and professional costs incurred in prior years and $1.5 million higher net interest inflows. These decreases were partially offset by receipt of $1.7 million less from our depository to reimburse certain expenses incurred by us in respect of our ADR program in the six months ended June 30, 2024 than the six months ended June 30, 2023 and $0.7 million higher operating expense payments.

Investing Activities

Net cash used in investing activities for the six months ended June 30, 2024, was $0.7 million, an increase of $0.3 million from $0.4 million in the six months ended June 30, 2023. In both periods, these cash flows relate to payments to acquire intangible assets.

Financing Activities

Net cash provided by financing activities for the six months ended June 30, 2024 was $46.8 million, an increase of $46.7 million from $0.1 million in the six months ended June 30, 2023. The increase was due to the net proceeds received from the underwritten registered direct offering in June 2024.

Operating and Capital Expenditure Requirements

As of June 30, 2024, we had an accumulated deficit of $440.8 million. We expect to continue to report significant operating losses for the foreseeable future as we continue our research and development efforts and seek to obtain regulatory approval of our product candidates and any future product we develop.

We expect to continue to incur expenses in connection with our ongoing development activities related to our product candidates, our outsourced manufacturing activities and other associated costs including the management of our intellectual property portfolio. We also expect to continue to incur costs associated with operating as a U.S. public company listed on Nasdaq and as a domestic registrant.

These costs will increase further if we:

•

seek to develop additional product candidates;

•

seek regulatory approvals for any of our product candidates that successfully completes clinical trials;

•

potentially establish a sales, marketing, and distribution infrastructure and scale-up manufacturing capabilities to commercialize or co-commercialize any product candidates for which we may obtain regulatory approval and chose to commercialize directly;

•

expand our intellectual property portfolio;

•

add further clinical, scientific, operational, financial, legal and management information systems, and personnel, including personnel to support our development and to support our operations as a U.S. public company listed on Nasdaq; or

•

experience any delays or encounter any issues from any of the above, including but not limited to failed studies, complex results, safety issues, or other regulatory challenges.

We expect that our existing cash and cash equivalents will enable us to fund our currently committed clinical trials, operating expenses and capital expenditure requirements into 2027. We have based these estimates on assumptions that may prove to be wrong, and we may use our available capital resources sooner than we currently expect. Because of the numerous risks and uncertainties associated with the development of our product candidates and any future product candidates and because the extent to which we may enter into collaborations with third parties for development of any of our product candidates is unknown, we are unable to estimate the amounts of increased capital outlays and operating expenses associated with completing the research and development of our product candidates. Our future capital requirements will depend on many factors, including:

•

The costs for our activities related to our ongoing collaboration with Ultragenyx for setrusumab for the treatment of adults and children with OI; and potential future clinical trials for alvelestat in AATD and other potential indications;

•

the costs and timing of manufacturing clinical supplies of our product candidates;

•

the costs, timing, and outcome of regulatory review of our product candidates, including post-marketing studies that could be required by regulatory authorities;

•

the costs, timing, and outcome of potential future commercialization activities, including manufacturing, marketing, sales, life cycle management and distribution, for our product candidates that we commercialize directly;

•

the timing and amount of revenue, if any, received from commercial sales of our product candidates;

•

the costs and timing of preparing, filing, and prosecuting patent applications; maintaining and enforcing our intellectual property rights; and defending any intellectual property-related claims, including any claims by third parties that we are infringing, misappropriating or otherwise violating their intellectual property rights;

•

the sales price and availability of adequate third-party coverage and reimbursement for our product candidates;

•

the effect of competitors and market developments;

•

the performance of our collaborators and partners under the existing agreements on setrusumab, navicixizumab and, leflutrozole;

•

the extent to which we are able to acquire new product candidates or enter into licensing or collaboration arrangements for our product candidates, although we currently have no commitments or agreements to complete any such transactions;

•

milestone and deferred payments under Mereo’s license and option agreement with AstraZeneca;

•

whether we need to repay the principal and interest on our Convertible Loan Note due in February 2025. We currently assume it will be converted or otherwise refinanced with new debt or equity; and,

•

tax liabilities or other assessments and our ability to claim R&D tax credits or other reliefs.

Our revenues, if any, will be derived from development milestones or sales of any product candidates that we are able to successfully develop, receive regulatory approval for, and commercialize in future years. In the meantime, we will need to obtain substantial additional funds to achieve our business objective.

Adequate additional funds may not be available to us on acceptable terms, or at all. If we raised additional funds through collaborations, strategic alliances, or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us.

Any future debt financing or preferred equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends and may require the issuance of warrants, which could potentially dilute your ownership interests.

To the extent that we raise additional capital through the sale of equity or convertible debt securities, shareholders' ownership interests may be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a shareholder. If we are unable to raise additional funds through partnerships, debt or equity financings when needed, we may be required to delay, limit, reduce, or terminate our product development programs or any future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.

Critical Accounting Estimates

Our unaudited condensed consolidated financial statements are prepared in accordance with U.S. GAAP. The preparation of these unaudited condensed consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, costs and expenses, and related disclosures. On an ongoing basis, we evaluate our accounting estimates based on historical experience and on various other assumptions that we believe are reasonable under the circumstances. The actual impact on our financial performance could differ from these estimates under different assumptions or conditions.

An accounting estimate is considered critical if both (i) the nature of the estimates or assumptions is material due to the levels of subjectivity and judgment involved, and (ii) the impact within a reasonable range of outcomes of the estimates and assumptions is material to our unaudited condensed consolidated financial statements. We believe that there are no estimates and assumptions made in our unaudited condensed consolidated financial statements that rise to this level. Our critical accounting policies are described under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting

Estimates” in our 2023 Annual Report, which was filed with the SEC on March 27, 2024. If actual results or events differ materially from the estimates, judgments and assumptions used by us in applying these policies, our reported financial condition and results of operations could be materially affected. Other than as disclosed in Note 2 to the unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q, there have been no significant changes to our critical accounting estimates from those described in our 2023 Annual Report.

Safe Harbor

See the section titled “Information Regarding Forward-Looking Statements” at the beginning of this Quarterly Report.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

There have been no material changes to the Company’s exposure to market risk during the three months ended June 30, 2024. For a discussion of the Company’s exposure to market risk, please refer to the Company’s market risk disclosures set forth in Part II, Item 7A, “Quantitative and Qualitative Disclosures About Market Risk” in our Annual Report on Form 10-K for the year ended December 31, 2023.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a 15(e) and 15d 15(e)) under the Securities and Exchange Act of 1934, as amended (“Exchange Act”) as of June 30, 2024.

Based on such evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective at June 30, 2024.

Changes in Internal Control over Financial Reporting.

No changes in our internal control over financial reporting (as defined in Rules 13a-15(e) and 15d – 15(e)) under Exchange Act) occurred during the quarter ended June 30, 2024 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II – OTHER INFORMATION

Item 1. Legal Proceedings

As of June 30, 2024, we were not a party to any material legal proceedings.

Item 1A. Risk Factors

There have been no material changes from the risk factors previously disclosed in the Company’s most recent Annual Report on Form 10-K as filed with the SEC on March 27, 2024.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

Not applicable.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

During the three-month period ended June 30, 2024, none of our directors or officers adopted, modified or terminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” as such terms are defined in Item 408(a) of Regulation S-K.

Item 6. Exhibits

The following exhibits are either provided with this Quarterly Report on Form 10-Q or are incorporated herein by reference:


Exhibit Number		Description of Exhibit

1.1		Underwriting Agreement, dated June 14, 2024, by and among the Company and Jefferies LLC, Leerink Partners LLC and Cantor Fitzgerald & Co. as underwriters.(incorporated by reference to Exhibit 1.1 to the Company’s Current Report on Form 8-K filed June 14, 2024 (File No. 001-38452)).

10.1		Extension Letter to the Cooperation Agreement between the Company and Rubric Capital, dated April 15, 2024 (previously filed as Exhibit 10.1 to the Company's Current Report on Form 8-K filed April 15, 2024 and incorporated therein by reference).

31.1*		Certification of Chief Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2*		Certification of Chief Financial Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1**		Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2**		Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101.INS		Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

101.SCH		Inline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents

104		The cover page for the Company's Quarterly Report on Form 10-Q has been formatted in Inline XBRL and contained in Exhibit 101

* Filed herewith.

** Furnished herewith.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized, on August 13, 2024.



	MEREO BIOPHARMA GROUP PLC


Date: August 13, 2024	/s/ Denise Scots-Knight
	Denise Scots-Knight
	Chief Executive Officer


Date: August 13, 2024	/s/ Christine Fox
	Christine Fox
	Chief Financial Officer

Exhibit 31.1

Certification by the Chief Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Denise Scots-Knight, certify that:


1.	I have reviewed this quarterly report on Form 10-Q of Mereo BioPharma Group plc (the “Company”);


2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;


3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;


4.	The Company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:


	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;


	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;


	c)	Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and


	d)	Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the period covered by the quarterly report that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and


5.	The Company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit and risk committee of the Company’s board of directors (or persons performing the equivalent functions):


	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and


	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

Date: August 13, 2024



/s/ Denise Scots-Knight
Name:		Denise Scots-Knight
Title:		Chief Executive Officer

Exhibit 31.2

Certification by the Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Christine Fox, certify that:


1.	I have reviewed this quarterly report on Form 10-Q of Mereo BioPharma Group plc (the “Company”);


2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;


3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the Company as of, and for, the periods presented in this report;


4.	The Company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the Company and have:


	a)	Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the Company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;


	b)	Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;


	c)	Evaluated the effectiveness of the Company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and


	d)	Disclosed in this report any change in the Company’s internal control over financial reporting that occurred during the period covered by the quarterly report that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting; and


5.	The Company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the Company’s auditors and the audit and risk committee of the Company’s board of directors (or persons performing the equivalent functions):


	a)	All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the Company’s ability to record, process, summarize and report financial information; and


	b)	Any fraud, whether or not material, that involves management or other employees who have a significant role in the Company’s internal control over financial reporting.

Date: August 13, 2024



/s/ Christine Fox
Name:		Christine Fox
Title:		Chief Financial Officer

Exhibit 32.1

Certification by the Chief Executive Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the quarterly report of Mereo BioPharma Group plc (the “Company”) on Form 10-Q for the quarterly period ended June 30, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Denise Scots-Knight, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 13, 2024



By:		/s/ Denise Scots-Knight
Name:		Denise Scots-Knight
Title:		Chief Executive Officer

Exhibit 32.2

Certification by the Chief Financial Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the quarterly report of Mereo BioPharma Group plc (the “Company”) on Form 10-Q for the quarterly period ended June 30, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Christine Fox, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 13, 2024



By:		/s/ Christine Fox
Name:		Christine Fox
Title:		Chief Financial Officer

Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2024	Aug. 12, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2024
Document Fiscal Year Focus	2024
Entity File Number	001-38452
Entity Registrant Name	MEREO BIOPHARMA GROUP PLC
Entity Incorporation, State or Country Code	X0
Entity Address, Address Line One	One Cavendish Place
Entity Address, Address Line Two	4th Floor
Entity Address, City or Town	London
Entity Address, Country	GB
Entity Address, Postal Zip Code	W1G 0QF
City Area Code	+44
Local Phone Number	333-023-7300
Entity Tax Identification Number	00-0000000
Title of 12(g) Security	None
Trading Symbol	MREO
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		769,262,609
Entity Interactive Data Current	Yes
Entity Central Index Key	0001719714
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Ordinary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	Ordinary Shares, nominal value of £0.003 per share
Security Exchange Name	NASDAQ
American Depositary Shares [Member]
Document Information [Line Items]
Title of 12(b) Security	American Depositary Shares, each representing five ordinary shares, nominal value of £0.003 per share
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 87,431	$ 57,421
Prepaid expenses and other current assets	4,489	5,156
Research and development incentives receivables	2,020	1,183
Total current assets	93,940	63,760
Property and equipment, net	338	405
Operating lease right of use assets, net	985	1,245
Intangible assets, net	866	1,089
Total assets	96,129	66,499
Current liabilities:
Accounts payable	2,700	2,346
Accrued expenses	3,721	5,467
Convertible loan notes - current	4,931	0
Operating lease liabilities - current	679	652
Other current liabilities	3,435	1,021
Total current liabilities	15,466	9,486
Convertible loan notes - non current	0	4,394
Warrant liabilities - non current	925	412
Operating lease liabilities- non current	552	906
Other non-current liabilities	536	764
Total liabilities	17,479	15,962
Commitments and contingencies (Note 16)
Shareholders' Equity
Ordinary shares, par value 0.003 per share; 768,821,274 shares issued at June 30, 2024 (December 31, 2023: 701,217,089).	3,032	2,775
Treasury shares	0	(1,230)
Additional paid-in capital	534,732	486,107
Accumulated deficit	(440,836)	(419,630)
Accumulated other comprehensive loss	(18,278)	(17,485)
Total shareholders' equity	78,650	50,537
Total liabilities and shareholders' equity	$ 96,129	$ 66,499

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - £ / shares	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Ordinary stock, par value	£ 0.003	£ 0.003
Ordinary stock, shares issued	768,821,274	701,217,089

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenue	$ 0	$ 9,000	$ 0	$ 9,000
Operating expenses:
Cost of revenue	0	(3,430)	0	(3,083)
Research and development	(4,946)	(3,712)	(8,939)	(9,019)
General and administrative	(7,868)	(2,669)	(13,777)	(9,119)
Loss from operations	(12,814)	(811)	(22,716)	(12,221)
Other income/(expenses)
Interest income	559	373	1,175	679
Interest expense	(331)	(1,029)	(641)	(1,829)
Changes in the fair value of financial instruments	(69)	(102)	(517)	440
Foreign currency transaction gain/(loss), net	31	(803)	644	(2,010)
Other expenses, net	0	0	0	(6)
Benefit from research and development tax credit	369	621	847	1,120
Net loss before income tax	(12,255)	(1,751)	(21,208)	(13,827)
Income tax benefit	0	0	0	0
Net loss	$ (12,255)	$ (1,751)	$ (21,208)	$ (13,827)
Loss per share - basic	$ (0.02)	$ 0	$ (0.03)	$ (0.02)
Loss per share - diluted	$ (0.02)	$ 0	$ (0.03)	$ (0.02)
Weighted average shares outstanding - basic	711,770,804	628,421,064	706,407,371	626,185,695
Weighted average shares outstanding - diluted	711,770,804	628,421,064	706,407,371	626,185,695
Net loss	$ (12,255)	$ (1,751)	$ (21,208)	$ (13,827)
Other comprehensive (loss)/income - Foreign currency translation adjustments, net of tax	5	1,400	(793)	3,678
Total comprehensive loss	$ (12,250)	$ (351)	$ (22,001)	$ (10,149)

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities
Net loss	$ (21,208)	$ (13,827)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	4,138	2,576
Depreciation	64	82
Amortization of intangible assets	216	171
Amortization of operating lease right-of-use assets	252	245
Change in fair value of warrants	517	(440)
Non-cash interest expense	615	941
Non-cash interest income	0	(103)
Foreign currency transaction (gain)/loss	(644)	2,010
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	644	(6,108)
Research and development incentives receivable	(847)	(1,924)
Accounts payable	368	(1,494)
Accrued expenses and other liabilities	306	1,149
Operating lease liabilities	(316)	(280)
Net cash used in operating activities	(15,895)	(17,002)
Cash flows from investing activities
Purchase of intangible assets	(699)	(419)
Net cash used in investing activities	(699)	(419)
Cash flows from financing activities
Proceeds from financing agreement with TAP	0	100
Proceeds from issuance of ordinary shares	47,000	0
Transaction costs on issuance of ordinary shares	(219)	0
Transaction costs on convertible loan notes	0	(33)
Net cash provided by financing activities	46,781	67
Increase/(decrease) in cash and cash equivalents	30,187	(17,354)
Cash and cash equivalents at January 1	57,421	68,182
Effect of exchange rate changes	(177)	2,139
Cash and cash equivalents at June 30	87,431	52,967
Supplemental disclosure
Cash paid for interest	10	863
Cash paid for income taxes	0	37
Cash paid for the amounts included in the measurement of operating lease liabilities	387	377
Supplemental disclosure of non-cash investing and financing activities
Issuance of ordinary shares - transaction costs not yet paid	$ 804	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Performance Based Restricted Stock Units	Ordinary Shares	Ordinary Shares Performance Based Restricted Stock Units	Treasury Shares	Additional Paid-in Capital	Additional Paid-in Capital Performance Based Restricted Stock Units	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Beginning balance, shares at Dec. 31, 2022			624,928,519,000		1,003,030,000
Beginning balance, value at Dec. 31, 2022	$ 51,402		$ 2,478		$ (1,335)	$ 476,521		$ (21,687)	$ (404,575)
Net loss	(12,076)								(12,076)
Foreign currency translation adjustments	2,278							2,278
Share-based compensation	1,635					1,635
Extinguishment and reissuance of convertible loan note	1,161					1,161
Ending balance, shares at Mar. 31, 2023			624,928,519,000		1,003,030,000
Ending balance, value at Mar. 31, 2023	44,400		$ 2,478		$ (1,335)	479,317		(19,409)	(416,651)
Beginning balance, shares at Dec. 31, 2022			624,928,519,000		1,003,030,000
Beginning balance, value at Dec. 31, 2022	51,402		$ 2,478		$ (1,335)	476,521		(21,687)	(404,575)
Net loss	(13,827)
Delivery of shares on vesting of restricted stock units, shares			501,380
Delivery of shares on vesting of restricted stock units			$ 2
Ending balance, shares at Jun. 30, 2023			643,204,794,000		1,003,030,000
Ending balance, value at Jun. 30, 2023	49,665		$ 2,547		$ (1,335)	479,080		(18,009)	(412,618)
Beginning balance, shares at Mar. 31, 2023			624,928,519,000		1,003,030,000
Beginning balance, value at Mar. 31, 2023	44,400		$ 2,478		$ (1,335)	479,317		(19,409)	(416,651)
Net loss	(1,751)								(1,751)
Foreign currency translation adjustments	1,400							1,400
Share-based compensation	943					943
Delivery of shares on vesting of restricted stock units, shares			501,380,000
Delivery of shares on vesting of restricted stock units	2		$ 2
Conversion of loan notes, shares			17,774,895,000
Extinguishment and reissuance of convertible loan note	4,617		$ 67			(1,234)			5,784
Issuance of warrants	54					54
Ending balance, shares at Jun. 30, 2023			643,204,794,000		1,003,030,000
Ending balance, value at Jun. 30, 2023	49,665		$ 2,547		$ (1,335)	479,080		(18,009)	(412,618)
Beginning balance, shares at Dec. 31, 2023			701,217,089,000		923,400,000
Beginning balance, value at Dec. 31, 2023	50,537		$ 2,775		$ (1,230)	486,107		(17,485)	(419,630)
Net loss	(8,951)								(8,951)
Foreign currency translation adjustments	(798)							(798)
Share-based compensation	2,050					2,050
Exercise of share options, shares			132,345,000		(210,485,000)
Exercise of share options, value			$ 0		$ 280	(280)
Delivery of shares on vesting of restricted stock units, shares					(712,915,000)
Delivery of shares on vesting of restricted stock units					$ 950	(950)
Ending balance, shares at Mar. 31, 2024			701,349,434,000		0
Ending balance, value at Mar. 31, 2024	42,838		$ 2,775		$ 0	486,927		(18,283)	(428,581)
Beginning balance, shares at Dec. 31, 2023			701,217,089,000		923,400,000
Beginning balance, value at Dec. 31, 2023	50,537		$ 2,775		$ (1,230)	486,107		(17,485)	(419,630)
Net loss	(21,208)
Ending balance, shares at Jun. 30, 2024			768,821,274,000		0
Ending balance, value at Jun. 30, 2024	78,650		$ 3,032		$ 0	534,732		(18,278)	(440,836)
Beginning balance, shares at Mar. 31, 2024			701,349,434,000		0
Beginning balance, value at Mar. 31, 2024	42,838		$ 2,775		$ 0	486,927		(18,283)	(428,581)
Net loss	(12,255)								(12,255)
Foreign currency translation adjustments	5							5
Share-based compensation	2,088					2,088
Exercise of share options, shares			800,890,000
Exercise of share options, value	(2)		$ 4			(6)
Delivery of shares on vesting of restricted stock units, shares				4,014,450,000
Delivery of shares on vesting of restricted stock units		$ (25)		$ 15			$ (40)
Issuance of shares, net of discount, shares			62,656,500,000
Issuance of shares, net of discount, value	47,000		$ 238			46,762
Transaction costs on issuance of shares	(999)					(999)
Ending balance, shares at Jun. 30, 2024			768,821,274,000		0
Ending balance, value at Jun. 30, 2024	$ 78,650		$ 3,032		$ 0	$ 534,732		$ (18,278)	$ (440,836)

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (12,255)	$ (8,951)	$ (1,751)	$ (12,076)	$ (21,208)	$ (13,827)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Jun. 30, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b5-1 Arrangement Modified	false
Non-Rule 10b5-1 Arrangement Modified	false

Nature of Business

6 Months Ended

Jun. 30, 2024

Nature Of Business Abstract

Nature of Business

1. Nature of business

Basis of Presentation and Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Basis Of Presentation And Summary Of Significant Accounting Policies	2. Basis of presentation and summary of significant accounting policies Basis of presentation The condensed consolidated financial statements of the Company and its subsidiaries and other financial information included in this Quarterly Report are unaudited, have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and are presented in U.S. dollars. All significant intercompany accounts and transactions between the Company and its subsidiaries have been eliminated on consolidation. The unaudited condensed consolidated financial statements presented in this Quarterly Report should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 27, 2024 (the “2023 Annual Report”). The condensed consolidated balance sheet as of December 31, 2023 was derived from audited consolidated financial statements included in the Company’s Annual Report but does not include all disclosures required by U.S. GAAP. The Company’s significant accounting policies are described in Note 2 to those consolidated financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted from these interim financial statements. However, these interim financial statements include all adjustments which are, in the opinion of management, necessary to fairly state the Company's financial position as of June 30, 2024, the results of operations for the three and six months ended June 30, 2024 and 2023 and cash flows for the six months ended June 30, 2024 and 2023. The interim results are not necessarily indicative of results to be expected for the full year. Going concern The Company is subject to risks common to companies in the biotechnology industry, including but not limited to, risks of delays in initiating or continuing research programs and clinical trials, risks of failure of preclinical studies and clinical trials, the need to obtain marketing approval for any drug product candidate that it may identify and develop, the need to successfully commercialize and gain market acceptance of its product candidates, if approved, dependence on key personnel and collaboration partners, protection of proprietary technology, compliance with government regulations, development by competitors of technological innovations, and the ability to secure additional capital to fund operations. Product candidates currently under development will require significant additional research and development efforts, including pre-clinical and clinical testing and regulatory approval prior to commercialization. Even if the Company’s research and development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales. The Company has historically been loss making, anticipates that it will continue to incur losses for the foreseeable future, and had an accumulated deficit of $440.8 million as of June 30, 2024. The Company has funded these losses through a combination of public equity financings, private equity and debt financings and various license and collaboration agreements, and it expects it will continue to do so until such time as it can generate significant revenue from product sales, or other commercial revenues, if ever, or through licensing and/or collaboration agreements for its rare disease or oncology product candidates. Although the Company recently raised net proceeds of $47.0 million before issuance costs through an underwritten registered direct offering of its ADSs, there is no assurance that it will continue to be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all. As of June 30, 2024, the Company had cash and cash equivalents of $87.4 million. The Company expects that its cash and cash equivalents as of June 30, 2024 will be sufficient to fund its operations and capital expenditure requirements for at least twelve months from the date of filing of this Quarterly Report on Form 10-Q. Use of estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting periods. Significant estimates and assumptions reflected in the Company's unaudited condensed financial statements include, but are not limited to, revenue recognition on contracts with customers and convertible loan notes. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates.

Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2024

Accounting Standards Update and Change in Accounting Principle [Abstract]

Recent accounting pronouncements

3. Recent accounting pronouncements

Fair Value Measurement

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Fair value measurement

4. Fair value measurement

The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis and classified under the appropriate level of the fair value hierarchy:

         
        As of June 30, 2024

         
        Total

        Level 1

        Level 2

        Level 3

         
        ($'000)

        ($'000)

        ($'000)

        ($'000)

        Financial liabilities

Warrant liabilities

925

—

925

—


	As of December 31, 2023
	Total		Level 1		Level 2		Level 3
	($'000)		($'000)		($'000)		($'000)
Financial liabilities
Warrant liabilities		412		—		412		—
CVR liability		—		—		—		—

There were no transfers between Level 1 and Level 2 during the three and six months ended June 30, 2024.

Warrant liabilities

At June 30, 2024 and December 31, 2023, warrant liabilities solely related to those warrants outstanding to the former lenders of the Company as described in Note 11.

Contingent Value Rights Agreement Liability ("CVR liability")

Prepaid Expenses and Other Current Assets

6 Months Ended

Jun. 30, 2024

Prepaid Expense and Other Assets, Current [Abstract]

Prepaid Expenses and Other Current Assets

5. Prepaid expenses and other current assets

Prepaid expenses and other current assets consisted of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
VAT receivable	$	653	$	599
Prepaid research and development services		1,204		632
Insurance claim receivable		—		1,950
Employee taxes on PSU vesting to be remitted		1,602		—
Security deposits		475		615
Other prepaid expense and current assets		555		1,360
Total	$	4,489	$	5,156

Property and Equipment , net

6 Months Ended

Jun. 30, 2024

Property, Plant and Equipment [Abstract]

Property and Equipment , net

6. Property and equipment, net

Property and equipment, net consists of the following:


	June 30,			December 31,
	2024			2023
	($'000)			($'000)
Leasehold improvements	$	718		$	710
Office equipment		198			199
IT equipment		299			296
Property and equipment, at cost		1,215			1,205
Less: accumulated depreciation		(877	)		(800	)
Property and equipment, net	$	338		$	405

Depreciation expense was less than $0.1 million for both the three and six months ended June 30, 2024 and 2023.

Leases

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Leases

7. Leases


	As of June 30,
	2024			2023
Operating leases
Weighted-average remaining contractual lease term (years)		1.95			2.95
Weighted average discount rate		10.0	%		10.0	%


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	($'000)		($'000)		($'000)		($'000)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	193	$	191	$	387	$	377

The following table summarizes the maturities of the Company’s operating lease liabilities as of June 30, 2024:


	As of June 30, 2024
	($'000)
Maturity analysis of the operating lease liabilities for the years ending December 31,
2024	$	387
2025		771
2026		193
Total undiscounted payments		1,351
Less: Present value discount		(120	)
Lease liability	$	1,231
Lease liability – current	$	679
Lease liability – non-current	$	552

Other Current Liabilities

6 Months Ended

Jun. 30, 2024

Other Liabilities Disclosure [Abstract]

Other current liabilities

8. Other current liabilities

Other current liabilities consist of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
Social security and other taxes		695	$	280
Employee taxes on PSU vesting to be remitted		1,602		—
Deferred consideration liability		276		711
Equity issuance costs payable		804		—
Other current liabilities		58		30
Total		3,435	$	1,021

Accrued Expenses

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

Accrued Expenses

9. Accrued expenses

Accrued expenses consist of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
Accrued research and development costs	$	765	$	1,821
Accrued legal fees		468		266
Accrued bonus		1,120		1,624
Accrued audit fees		370		671
Accrued professional fees		223		338
Accrued local taxes	-			382
Other accrued expenses		775		365
Total	$	3,721	$	5,467

Convertible Loan Notes

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Convertible Loan Notes

10. Convertible loan notes

Novartis Loan Note

Private Placement Loan Notes

Warrant Liability

6 Months Ended

Jun. 30, 2024

Warrants and Rights Note Disclosure [Abstract]

Warrant Liability

11. Warrant liability


	Warrant liabilities
	2024			2023
	($'000)			($'000)
At January 1		412			643
Fair value changes during the period		448			(542	)
Foreign exchange		(5	)		4
At March 31		855			105
Fair value changes during the period		69			102
Foreign exchange		1			3
At June 30		925			210

Warrant liability – private placement

Warrant liability – bank loan

Total outstanding warrants

The following table lists the weighted average inputs to the models used to calculate the fair value of warrants:


	June 30,			December 31,
	2024			2023
Expected volatility (%)		95			102
Risk-free interest rate (%)		4.05			3.36
Expected life of warrants (years)		3.7			5.2
Market price of ADS ($)		3.60			2.31
Model used	Black-Scholes		Black-Scholes

Shareholders' Equity

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

Shareholders' Equity

12. Shareholders’ Equity

Common Shares


	Number of ordinary shares		Cost ($'000)
At January 1, 2023 and March 31, 2023		624,928,519		2,478
Vesting of DRSUs		501,380		2
Conversion of convertible loan notes		17,774,895		67
At June 30, 2023		643,204,794		2,547

At January 1, 2024		701,217,089		2,775
Exercise of share options		132,345		—
At March 31, 2024		701,349,434		2,775
Exercise of share options		800,890		4
Vesting of PSUs		4,014,450		15
Issuance of shares		62,656,500		238
At June 30, 2024		768,821,274		3,032

During the three months ended June 30, 2024, 4,815,340 ordinary shares were issued due to the exercise of employee share options and the vesting of PSUs.

Revenue and Cost of Revenue

6 Months Ended

Jun. 30, 2024

Revenue Recognition and Deferred Revenue [Abstract]

Revenue and Cost of Revenue

13. Revenue and cost of revenue

There was no revenue earned, or cost of revenue recognized in the three and six months ended June 30, 2024.

Share Based Compensation

6 Months Ended

Jun. 30, 2024

Share-Based Payment Arrangement [Abstract]

Share Based Compensation

14. Share based compensation

The total number of ADSs available for issue under the 2019 EIP and 2019 NED EIP was 9.0 million as of June 30, 2024.

The expense for share-based compensation arises solely in respect of awards made under these two active plans as follows:


	Three Months Ended June 30,					Six Months Ended June 30,
		2024		2023		2024		2023
		($'000)		($'000)		($'000)		($'000)
2019 EIP			1,568		684		3,027		1,889
2019 NED EIP			520		259		1,111		687
Total			2,088		943		4,138		2,576

As of June 30, 2024, the total unrecognized compensation cost related to outstanding share awards was $7.3 million, which the Company expects to recognize over a weighted-average period of 1.7 years.

2019 EIP

The Company has awarded the following instruments under the 2019 EIP:

Market Value Options (“Options”)

A summary of the Company’s Option activity and related information under the 2019 EIP for the six months ended June 30, 2024 is as follows; all outstanding Options are expected to vest:


	Number of options (ADSs)			Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		9,595,161			1.63		1.41		8,133
Granted		2,477,404			3.35		2.60		—
Forfeited		(47,288	)		2.01		1.69		69
Exercised		(415,568	)		1.51		1.27		760
Expired		(5,000	)		3.32		2.93		—
At June 30, 2024		11,604,709			2.00		1.66		18,975
Vested		4,957,767			1.95		1.66		8,566
Unvested		6,646,942			2.03		1.67		10,409

The fair value of each Option is estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:


	Six Months Ended June 30,
	2024			2023
Market value of ADSs ($)	$	3.35		$	1.01
Risk-free interest rate (%)		4.02	%		3.43	%
Expected life (years)		6.25			10.00
Expected volatility (%)		90.78	%		98.06	%
Expected dividends		0.00	%		0.00	%

Restricted Stock Units (“RSUs”)

A summary of the Company’s RSU activity and related information under the 2019 EIP is as follows. As of June 30, 2024 all outstanding RSUs are expected to vest:


	Number of RSUs (ADSs)			Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		489,225			1.04		1,130
Granted		204,914			3.36		—
Vested		(142,583	)		1.01		480
Forfeited		(23,533	)		1.36		—
At June 30, 2024		528,023			1.93		1,901

At June 30, 2024, the weighted average remaining period of RSUs outstanding was 2.8 years.

Performance Based Restricted Stock Units (“PSUs”)


	Number of PSUs (ADSs)			Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,338,150			0.61		3,091
Granted		—			—		—
Forfeited		—			—		—
Vested		(802,890	)		0.65		2,798
At June 30, 2024		535,260			0.54		1,927

At June 30, 2024, the weighted average contractual life of PSUs outstanding was 0.6 years.

The grant date fair value is recognized over the expected life using the straight-line attribution method.

2019 NED EIP

The Company has awarded the following instruments under the 2019 NED EIP:

Options


	Number of options (ADSs)		Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,355,087		1.66		1.43		1,166
Granted		360,000		3.87		2.83		—
At June 30, 2024		1,715,087		2.12		1.72		2,700
Vested		1,475,087		1.84		1.54		2,700
Unvested		240,000		3.87		2.83		—

The fair value of each Option is estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:


	Six Months Ended June 30,
	2024			2023
Market value of ADSs ($)		3.87			0.94
Risk-free interest rate (%)		4.08	%		3.36	%
Expected life (years)		5.25			10.00
Expected volatility (%)		90.67	%		97.94	%
Expected dividends		—			—

The expected volatility assumption is calculated by reference to the historical volatility of an appropriate peer group of companies for a period equal to the expected term of the Option. The grant date fair value is recognized over the vesting period using the accelerated graded-vesting attribution method.

Deferred Restricted Stock Units (“DRSUs”)

A summary of the Company’s DRSU activity and related information under the 2019 NED EIP for the six months ended June 30, 2024 is as follows; all outstanding DRSUs are expected to vest:


	Number of DRSUs (ADSs)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		729,982		1.01		1,686
Granted		125,393		3.87		485
Forfeited		—		—		—
At June 30, 2024		855,375		1.43		3,079
Vested		771,778		1.17		2,778
Unvested		83,597		3.87		301

Previous Share Option Plans


	Number of options (ADSs)			Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,572,358			9.22		8.19		—
Expired		(152,491	)		—		—		—
At June 30, 2024		1,419,867			9.24		9.05		—

The weighted average contractual life of Options outstanding and vested at June 30, 2024 and December 31, 2023 was 1.3 years and 1.8 years respectively.

Loss Per Share

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Loss Per Share

15. Loss per share


	Three Months Ended June 30,						Six Months Ended June 30,
	2024			2023			2024			2023
	($'000, except share and per share amounts)			($'000, except share and per share amounts)			($'000, except share and per share amounts)			($'000, except share and per share amounts)
Net loss	$	(12,255	)	$	(1,751	)	$	(21,208	)	$	(13,827	)
Net loss per share - basic and diluted	$	(0.02	)	$	(0.00	)	$	(0.03	)	$	(0.02	)
Weighted-average number of shares used in computing net loss per share - basic and diluted		711,770,804			628,421,064			706,407,371			626,185,695


	Six Months Ended June 30,
	2024		2023
Options		73,698,315		64,289,090
RSUs		2,640,115		2,738,750
PSUs		2,676,300		6,690,750
DRSUs		4,276,875		3,637,905
Convertible loan notes – Novartis		16,308,364		15,000,137
Convertible loan notes – private placement		-		24,279,659
Warrants to purchase ordinary shares		7,539,129		7,539,129
AstraZeneca milestones potentially payable in equity		1,349,692		1,349,692

Commitments and Contingencies

6 Months Ended

Jun. 30, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

16. Commitments and contingencies

Indemnification agreements

Novartis Asset Purchase agreements

License agreements

Research and development activities

Legal proceedings

Related Party Disclosures

6 Months Ended

Jun. 30, 2024

Related Party Disclosures

17. Related party disclosures

In the three and six months ended June 30, 2024 and 2023, there were no reportable related party transactions.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2024
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation The condensed consolidated financial statements of the Company and its subsidiaries and other financial information included in this Quarterly Report are unaudited, have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and are presented in U.S. dollars. All significant intercompany accounts and transactions between the Company and its subsidiaries have been eliminated on consolidation. The unaudited condensed consolidated financial statements presented in this Quarterly Report should be read in conjunction with the consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 27, 2024 (the “2023 Annual Report”). The condensed consolidated balance sheet as of December 31, 2023 was derived from audited consolidated financial statements included in the Company’s Annual Report but does not include all disclosures required by U.S. GAAP. The Company’s significant accounting policies are described in Note 2 to those consolidated financial statements. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted from these interim financial statements. However, these interim financial statements include all adjustments which are, in the opinion of management, necessary to fairly state the Company's financial position as of June 30, 2024, the results of operations for the three and six months ended June 30, 2024 and 2023 and cash flows for the six months ended June 30, 2024 and 2023. The interim results are not necessarily indicative of results to be expected for the full year.
Going concern	Going concern The Company is subject to risks common to companies in the biotechnology industry, including but not limited to, risks of delays in initiating or continuing research programs and clinical trials, risks of failure of preclinical studies and clinical trials, the need to obtain marketing approval for any drug product candidate that it may identify and develop, the need to successfully commercialize and gain market acceptance of its product candidates, if approved, dependence on key personnel and collaboration partners, protection of proprietary technology, compliance with government regulations, development by competitors of technological innovations, and the ability to secure additional capital to fund operations. Product candidates currently under development will require significant additional research and development efforts, including pre-clinical and clinical testing and regulatory approval prior to commercialization. Even if the Company’s research and development efforts are successful, it is uncertain when, if ever, the Company will realize significant revenue from product sales. The Company has historically been loss making, anticipates that it will continue to incur losses for the foreseeable future, and had an accumulated deficit of $440.8 million as of June 30, 2024. The Company has funded these losses through a combination of public equity financings, private equity and debt financings and various license and collaboration agreements, and it expects it will continue to do so until such time as it can generate significant revenue from product sales, or other commercial revenues, if ever, or through licensing and/or collaboration agreements for its rare disease or oncology product candidates. Although the Company recently raised net proceeds of $47.0 million before issuance costs through an underwritten registered direct offering of its ADSs, there is no assurance that it will continue to be successful in obtaining sufficient funding on terms acceptable to the Company to fund continuing operations, if at all. As of June 30, 2024, the Company had cash and cash equivalents of $87.4 million. The Company expects that its cash and cash equivalents as of June 30, 2024 will be sufficient to fund its operations and capital expenditure requirements for at least twelve months from the date of filing of this Quarterly Report on Form 10-Q.
Use of estimates	Use of estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting periods. Significant estimates and assumptions reflected in the Company's unaudited condensed financial statements include, but are not limited to, revenue recognition on contracts with customers and convertible loan notes. Estimates are periodically reviewed in light of changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from those estimates.

Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis and classified under the appropriate level of the fair value hierarchy:

         
        As of June 30, 2024

         
        Total

        Level 1

        Level 2

        Level 3

         
        ($'000)

        ($'000)

        ($'000)

        ($'000)

        Financial liabilities

Warrant liabilities

925

—

925

—


	As of December 31, 2023
	Total		Level 1		Level 2		Level 3
	($'000)		($'000)		($'000)		($'000)
Financial liabilities
Warrant liabilities		412		—		412		—
CVR liability		—		—		—		—

Prepaid Expenses and Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2024

Prepaid Expense and Other Assets, Current [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
VAT receivable	$	653	$	599
Prepaid research and development services		1,204		632
Insurance claim receivable		—		1,950
Employee taxes on PSU vesting to be remitted		1,602		—
Security deposits		475		615
Other prepaid expense and current assets		555		1,360
Total	$	4,489	$	5,156

Property and Equipment , net (Tables)

6 Months Ended

Jun. 30, 2024

Property, Plant and Equipment [Abstract]

Summary of Property and equipment, net

Property and equipment, net consists of the following:


	June 30,			December 31,
	2024			2023
	($'000)			($'000)
Leasehold improvements	$	718		$	710
Office equipment		198			199
IT equipment		299			296
Property and equipment, at cost		1,215			1,205
Less: accumulated depreciation		(877	)		(800	)
Property and equipment, net	$	338		$	405

Leases (Tables)

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Weighted Average Remaining Lease Term and Discount Rate


	As of June 30,
	2024			2023
Operating leases
Weighted-average remaining contractual lease term (years)		1.95			2.95
Weighted average discount rate		10.0	%		10.0	%


	Three Months Ended June 30,				Six Months Ended June 30,
	2024		2023		2024		2023
	($'000)		($'000)		($'000)		($'000)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	193	$	191	$	387	$	377

Schedule of Maturities of Operating lease liabilities

The following table summarizes the maturities of the Company’s operating lease liabilities as of June 30, 2024:


	As of June 30, 2024
	($'000)
Maturity analysis of the operating lease liabilities for the years ending December 31,
2024	$	387
2025		771
2026		193
Total undiscounted payments		1,351
Less: Present value discount		(120	)
Lease liability	$	1,231
Lease liability – current	$	679
Lease liability – non-current	$	552

Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2024

Other Liabilities Disclosure [Abstract]

Schedule of other current liabilities

Other current liabilities consist of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
Social security and other taxes		695	$	280
Employee taxes on PSU vesting to be remitted		1,602		—
Deferred consideration liability		276		711
Equity issuance costs payable		804		—
Other current liabilities		58		30
Total		3,435	$	1,021

Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:


	June 30,		December 31,
	2024		2023
	($'000)		($'000)
Accrued research and development costs	$	765	$	1,821
Accrued legal fees		468		266
Accrued bonus		1,120		1,624
Accrued audit fees		370		671
Accrued professional fees		223		338
Accrued local taxes	-			382
Other accrued expenses		775		365
Total	$	3,721	$	5,467

Share Based Compensation (Tables)

6 Months Ended

Jun. 30, 2024

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of Share Based Compensation

The expense for share-based compensation arises solely in respect of awards made under these two active plans as follows:


	Three Months Ended June 30,					Six Months Ended June 30,
		2024		2023		2024		2023
		($'000)		($'000)		($'000)		($'000)
2019 EIP			1,568		684		3,027		1,889
2019 NED EIP			520		259		1,111		687
Total			2,088		943		4,138		2,576

Summary of Option Activity and Related Information

A summary of the Company’s Option activity and related information under the 2019 EIP for the six months ended June 30, 2024 is as follows; all outstanding Options are expected to vest:


	Number of options (ADSs)			Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		9,595,161			1.63		1.41		8,133
Granted		2,477,404			3.35		2.60		—
Forfeited		(47,288	)		2.01		1.69		69
Exercised		(415,568	)		1.51		1.27		760
Expired		(5,000	)		3.32		2.93		—
At June 30, 2024		11,604,709			2.00		1.66		18,975
Vested		4,957,767			1.95		1.66		8,566
Unvested		6,646,942			2.03		1.67		10,409

Summary of Assumptions used in Black-Scholes Option Pricing Model

The fair value of each Option is estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:


	Six Months Ended June 30,
	2024			2023
Market value of ADSs ($)	$	3.35		$	1.01
Risk-free interest rate (%)		4.02	%		3.43	%
Expected life (years)		6.25			10.00
Expected volatility (%)		90.78	%		98.06	%
Expected dividends		0.00	%		0.00	%

Summary of Restricted Stock Unit Activity and Related Information

A summary of the Company’s RSU activity and related information under the 2019 EIP is as follows. As of June 30, 2024 all outstanding RSUs are expected to vest:


	Number of RSUs (ADSs)			Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		489,225			1.04		1,130
Granted		204,914			3.36		—
Vested		(142,583	)		1.01		480
Forfeited		(23,533	)		1.36		—
At June 30, 2024		528,023			1.93		1,901

Summary of Performance Based Restricted Stock Unit (PSUs) Activity and Related Information

A summary of the Company’s PSU activity and related information under the 2019 EIP for the six months ended June 30, 2024 is as follows:


	Number of PSUs (ADSs)			Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,338,150			0.61		3,091
Granted		—			—		—
Forfeited		—			—		—
Vested		(802,890	)		0.65		2,798
At June 30, 2024		535,260			0.54		1,927

Employee Stock Option

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of Option Activity and Related Information

A summary of the Company’s Option activity and related information under the 2019 NED EIP for the six months ended June 30, 2024 is as follows; all outstanding Options are expected to vest:


	Number of options (ADSs)		Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,355,087		1.66		1.43		1,166
Granted		360,000		3.87		2.83		—
At June 30, 2024		1,715,087		2.12		1.72		2,700
Vested		1,475,087		1.84		1.54		2,700
Unvested		240,000		3.87		2.83		—

Summary of Assumptions used in Black-Scholes Option Pricing Model

The fair value of each Option is estimated on the date of grant using the Black-Scholes option pricing model based on the following weighted average assumptions:


	Six Months Ended June 30,
	2024			2023
Market value of ADSs ($)		3.87			0.94
Risk-free interest rate (%)		4.08	%		3.36	%
Expected life (years)		5.25			10.00
Expected volatility (%)		90.67	%		97.94	%
Expected dividends		—			—

Deferred Restricted Stock Units [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of Restricted Stock Unit Activity and Related Information

A summary of the Company’s DRSU activity and related information under the 2019 NED EIP for the six months ended June 30, 2024 is as follows; all outstanding DRSUs are expected to vest:


	Number of DRSUs (ADSs)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		729,982		1.01		1,686
Granted		125,393		3.87		485
Forfeited		—		—		—
At June 30, 2024		855,375		1.43		3,079
Vested		771,778		1.17		2,778
Unvested		83,597		3.87		301

Previous Share Option Plans [Member]

Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]

Summary of Option Activity and Related Information

A summary of the awards still outstanding under these plans is as follows:


	Number of options (ADSs)			Weighted Average Exercise Price ($)		Weighted Average Grant Date Fair Value ($)		Aggregate intrinsic value ($'000)
At December 31, 2023		1,572,358			9.22		8.19		—
Expired		(152,491	)		—		—		—
At June 30, 2024		1,419,867			9.24		9.05		—

Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Ordinary Shares Outstanding and The Effect of Dilutive Ordinary Share

Diluted loss per share is based on dividing the loss attributable for the year, adjusted for the effect of dilutive ordinary shares, by ordinary share equivalents, which includes the weighted average number of ordinary shares outstanding and the effect of dilutive ordinary share equivalents.


	Three Months Ended June 30,						Six Months Ended June 30,
	2024			2023			2024			2023
	($'000, except share and per share amounts)			($'000, except share and per share amounts)			($'000, except share and per share amounts)			($'000, except share and per share amounts)
Net loss	$	(12,255	)	$	(1,751	)	$	(21,208	)	$	(13,827	)
Net loss per share - basic and diluted	$	(0.02	)	$	(0.00	)	$	(0.03	)	$	(0.02	)
Weighted-average number of shares used in computing net loss per share - basic and diluted		711,770,804			628,421,064			706,407,371			626,185,695

Schedule of Potentially Dilutive Shares Were Not Included In The Calculation of Diluted Shares Outstanding.


	Six Months Ended June 30,
	2024		2023
Options		73,698,315		64,289,090
RSUs		2,640,115		2,738,750
PSUs		2,676,300		6,690,750
DRSUs		4,276,875		3,637,905
Convertible loan notes – Novartis		16,308,364		15,000,137
Convertible loan notes – private placement		-		24,279,659
Warrants to purchase ordinary shares		7,539,129		7,539,129
AstraZeneca milestones potentially payable in equity		1,349,692		1,349,692

Shareholders' Equity (Tables)

6 Months Ended

Jun. 30, 2024

Equity [Abstract]

Summary of Common Shares


	Number of ordinary shares		Cost ($'000)
At January 1, 2023 and March 31, 2023		624,928,519		2,478
Vesting of DRSUs		501,380		2
Conversion of convertible loan notes		17,774,895		67
At June 30, 2023		643,204,794		2,547

At January 1, 2024		701,217,089		2,775
Exercise of share options		132,345		—
At March 31, 2024		701,349,434		2,775
Exercise of share options		800,890		4
Vesting of PSUs		4,014,450		15
Issuance of shares		62,656,500		238
At June 30, 2024		768,821,274		3,032

Warrant Liability (Tables)

6 Months Ended

Jun. 30, 2024

Warrants and Rights Note Disclosure [Abstract]

Schedule on the Fair Value Change in Derivative Liabilities


	Warrant liabilities
	2024			2023
	($'000)			($'000)
At January 1		412			643
Fair value changes during the period		448			(542	)
Foreign exchange		(5	)		4
At March 31		855			105
Fair value changes during the period		69			102
Foreign exchange		1			3
At June 30		925			210

Shedule Of Weighted Average Inputs To The Models Used For The Fair Value Of Warrants Granted Explanatory

The following table lists the weighted average inputs to the models used to calculate the fair value of warrants:


	June 30,			December 31,
	2024			2023
Expected volatility (%)		95			102
Risk-free interest rate (%)		4.05			3.36
Expected life of warrants (years)		3.7			5.2
Market price of ADS ($)		3.60			2.31
Model used	Black-Scholes		Black-Scholes

Basis of Presentation and Summary of Significant Accounting Policies (Additional Information) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Accumulated deficit	$ (440,836)	$ (419,630)
Net Proceeds	47,000
Cash and cash equivalents	$ 87,431	$ 57,421

Fair Value Measurement (Additional Information) (Details) - Contingent Value Rights - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities Fair Value Disclosure		$ 0
Amounts payable	$ 0

Fair Value Measurement - Schedule of financial assets and liabilities measured at fair value on a recurring basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Contingent Value Rights
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total		$ 0
Warrant liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total	$ 925	412
Level 1 \| Contingent Value Rights
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total		0
Level 1 \| Warrant liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total	0	0
Level 2 \| Contingent Value Rights
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total		0
Level 2 \| Warrant liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total	925	412
Level 3 \| Contingent Value Rights
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total		0
Level 3 \| Warrant liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Liabilities Fair Value Disclosure, Total	$ 0	$ 0

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses And Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
VAT receivable	$ 653	$ 599
Prepaid research and development services	1,204	632
Insurance claim receivable	0	1,950
Employee taxes on PSU vesting to be remitted	1,602	0
Security deposits	475	615
Other prepaid expense and current assets	555	1,360
Total	$ 4,489	$ 5,156

Prepaid expenses and other current assets (Additional Information) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Standard amounts receivable	$ 1.6

Property and Equipment , net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 1,215	$ 1,205
Less: accumulated depreciation	(877)	(800)
Property and equipment, net	338	405
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	718	710
Office equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	198	199
IT Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 299	$ 296

Property and Equipment , net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Depreciation	$ 100	$ 100	$ 64	$ 82

Leases (Additional Information) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Operating costs and expenses		$ 0.2	$ 0.2	$ 0.3	$ 0.3
Subsequent Event [Member]
Finite-Lived Intangible Assets [Line Items]
Lease expiration date	Jun. 30, 2026
Lease period extension \| Subsequent Event [Member]
Finite-Lived Intangible Assets [Line Items]
Lease expiration date	Jun. 30, 2026

Leases - Weighted Average Remaining Lease Term and Discount Rate (Details)	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Weighted-average remaining contractual lease term (years)	1 year 11 months 12 days	2 years 11 months 12 days
Weighted average discount rate	10.00%	10.00%

Leases - Cash Paid for Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Leases [Abstract]
Operating cash flows from operating leases	$ 193	$ 191	$ 387	$ 377

Leases - Schedule of Maturities of Operating lease liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Leases [Abstract]
2024	$ 387
2025	771
2026	193
Total undiscounted payments	1,351
Less: Present value discount	(120)
Lease Liability	1,231
Lease liability - current	679	$ 652
Lease liability - non current	$ 552	$ 906

Other current liabilities - Schedule of Other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Other Liabilities Disclosure [Abstract]
Social security and other taxes	$ 695	$ 280
Employee taxes on PSU vesting to be remitted	1,602	0
Deferred consideration liability	276	711
Equity issuance costs payable	804	0
Other current liabilities	58	30
Total	$ 3,435	$ 1,021

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accrued research and development costs	$ 765	$ 1,821
Accrued legal fees	468	266
Accrued bonus	1,120	1,624
Accrued audit fees	370	671
Accrued professional fees	223	338
Accrued local taxes	0	382
Other accrued expenses	775	365
Total	$ 3,721	$ 5,467

Convertible Loan Notes (Additional Information) (Details) £ / shares in Units, £ in Millions			1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Feb. 10, 2023 USD ($) shares	Feb. 10, 2020 GBP (£) £ / shares shares	May 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 £ / shares	Dec. 31, 2020 £ / shares	Feb. 10, 2020 USD ($) shares
Ordinary Shares \| Novartis Pharma [Member]
Debt Instrument [Line Items]
Exercise Price of Warrants Issued \| £ / shares		£ 0.265
Novartis Loan Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate		6.00%											6.00%
Carrying Value of Debt Instrument				$ 4,900,000			$ 4,900,000			$ 4,400,000
Fair value of convertible debt				$ 3,300,000			$ 3,300,000			$ 3,100,000
Debt Instrument, Effective Interest Rate				27.80%		27.80%	27.80%	27.80%
Novartis Loan Note [Member] \| After Amendments [Member]
Debt Instrument [Line Items]
Debt Instrument, Effective Interest Rate						37.40%		37.40%
Novartis Loan Note [Member] \| Novartis Pharma [Member]
Debt Instrument [Line Items]
Amount of Convertible Note		£ 3.8											$ 5,200,000
Conversion Price Per Share \| £ / shares		£ 0.265
Debt Instrument, Maturity Date		Feb. 10, 2023
Warrants Convertible in Equity \| shares		1,449,614											1,449,614
Debt Instrument, Extended Maturity Date	Feb. 10, 2025
Debt Instrument, Amended Interest Rate	9.00%
Debt Instrument, Amended Accrued Interest	$ 900,000
Novartis Loan Note [Member] \| Ordinary Shares \| Novartis Pharma [Member]
Debt Instrument [Line Items]
Warrants Convertible in Equity \| shares	2,000,000
New Novartis Loan Note [Member]
Debt Instrument [Line Items]
Carrying Value of Debt Instrument	$ 5,500,000
Debt Instrument, Consideration, Liability Recognised Two	3,400,000
Debt Instrument, Interest Paid in Cash	900,000
Relative Fair value of the Warrants and The Conversion Option	1,200,000
Gain (Loss) on Extinguishment of Debt	$ 0
Debt, Interest Expense				$ 300,000		$ 200,000	$ 600,000	$ 500,000
Convertible Debt Instrument [Member] \| Private Placement Loan Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate												6.00%
Debt Instrument, Maturity Date									Jun. 03, 2023
Debt Instrument, Extended Maturity Date			Aug. 03, 2023
Debt, Interest Expense						$ 700,000		$ 1,100,000
Debt Instrument, Effective Interest Rate				27.10%			27.10%			25.10%
Debt Instrument, Aggregate Principal Amount				$ 4,600,000			$ 4,600,000
Issuance of Private Placement Loan Notes									$ 70,000,000
Changes in Carrying Value of Debt Instrument			$ 600,000
Payment of Debt Outstanding Amount										$ 3,200,000
Convertible Debt Instrument [Member] \| Ordinary Shares \| Private Placement Loan Notes [Member]
Debt Instrument [Line Items]
Conversion Price Per Share \| £ / shares												£ 0.174
Debt Instrument,Conversion, Shares Issued \| shares					9,645,200	17,774,895
Share Issued, Price per Share \| £ / shares											£ 0.174

Warrant Liability - Summary of change in fair value of the warrant liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023
Warrants and Rights Note Disclosure [Abstract]
Warrant liability , Beginning Period	$ 855	$ 412	$ 105	$ 643
Fair value changes during the year	69	448	102	(542)
Foreign Exchange	1	(5)	3	4
Warrant liability , Ending Period	$ 925	$ 855	$ 210	$ 105

Warrant Liability - Summary of weighted average inputs to the models used for the fair value of warrants (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Class of Warrant or Right [Line Items]
Expected volatility (%)	95.00%	102.00%
Risk-free interest rate (%)	4.05%	3.36%
Expected life of warrants (years)	3 years 8 months 12 days	5 years 2 months 12 days
Market price of ADS ($)	$ 3.6	$ 2.31
Model used	Black-Scholes	Black-Scholes

Warrant Liability (Additional Information) (Details)	Jun. 30, 2024 £ / shares shares	Jun. 30, 2024 $ / shares shares	Dec. 31, 2023 shares	Jun. 30, 2020 £ / shares shares
Class of Warrant or Right [Line Items]
Percentage Of Issued Shares Capital	0.30%	0.30%	0.40%
Warrants to purchase ordinary shares
Class of Warrant or Right [Line Items]
Warrants Outstanding	2,487,816	2,487,816	2,487,816
Private Placement Warrants
Class of Warrant or Right [Line Items]
Ordinary shares Underlying Warrants				161,048,366
Exercise Price Per Warrants \| £ / shares				£ 0.348
Bank Loan \| Ordinary Shares [Member] \| Two Thousand And Twenty Warrants
Class of Warrant or Right [Line Items]
Ordinary shares Underlying Warrants	1,243,908	1,243,908
Exercise Price Per Warrants \| $ / shares		$ 0.4144
Bank Loan \| Ordinary Shares [Member] \| Warrants Subscribed
Class of Warrant or Right [Line Items]
Ordinary shares Underlying Warrants	1,243,908	1,243,908
Exercise Price Per Warrants \| £ / shares	£ 2.95

Shareholders' Equity - Summary of Common Shares (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Cost	$ 78,650	$ 42,838	$ 49,665	$ 78,650	$ 49,665
Cost
Beginning balance, value	42,838	50,537	44,400	50,537	51,402
Exercise of share options, value	(2)
Vesting of DRSUs, value			2
Ending balance, value	$ 78,650	$ 42,838	$ 49,665	$ 78,650	$ 49,665
Common Shares
Ordinery stock, shares outstanding	768,821,274	701,349,434	643,204,794	768,821,274	643,204,794
Cost	$ 3,032	$ 2,775	$ 2,547	$ 3,032	$ 2,547
Number of ordinary shares
Beginning balance, shares	701,349,434	701,217,089	624,928,519	701,217,089	624,928,519
Exercise of share options, shares	800,890,000	132,345,000
Conversion of convertible loan notes, shares					17,774,895
Vesting of PSUs, shares	4,014,450
Vesting of DRSUs, shares			501,380,000		501,380
Issuance of shares, shares	62,656,500
Ending balance, shares	768,821,274	701,349,434	643,204,794	768,821,274	643,204,794
Cost
Beginning balance, value	$ 2,775	$ 2,775	$ 2,478	$ 2,775	$ 2,478
Exercise of share options, value	4	0
Conversion of convertible loan notes, value					67
Vesting of PSUs, value	15
Vesting of DRSUs, value			2		2
Issuance of shares, value	238
Ending balance, value	$ 3,032	$ 2,775	$ 2,547	$ 3,032	$ 2,547

Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jun. 17, 2024	Jun. 30, 2024	Mar. 31, 2024
Issuance of shares, net of discount, shares	12,531,300
Incurred stock issuance costs		$ 999
Ordinary Shares
Issuance of shares, net of discount, shares		62,656,500,000
Employee Share Options [Member]
Issuance of shares, net of discount, shares		4,815,340	132,345
Registered Direct Offering [Member]
Issuance of shares, net of discount, shares	62,656,500
Ordinary shares price per share	$ 3.99
Aggregate gross proceeds	$ 50,000
Net proceeds from registered direct offering	47,000
Underwriting discounts	3,000
Incurred stock issuance costs	$ 1,000

Income Taxes - Summary of Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Loss Carryforwards [Line Items]
Total income tax expense/(credit)	$ 0	$ 0	$ 0	$ 0

Revenue and Cost of revenue (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Revenue	$ 0	$ 9,000	$ 0	$ 9,000
Collaboration And Licensing Agreement \| Ultragenyx Partnership
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone proceeds		9,000		9,000
2015 asset purchase agreement under the collaboration and license agreement with Ultragenyx \| Ultragenyx Partnership
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Cost of revenue		$ 3,400		$ 3,100

Share Based Compensation (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation cost	$ 7.3
Weighted average recognition term	1 year 8 months 12 days
2019 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unvested	$ 1.67
Weighted average per share fair value of options, vesting	1.66
2019 Equity Incentive Plan [Member] \| Options Vesting [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of options, nonvested			6,169,952
Unvested			$ 1.13
Weighted average per share fair value of options, vesting	$ 1.14	$ 1.51
Weighted average contractual life of options, outstanding	8 years 1 month 6 days		8 years
Weighted average contractual life of options, vested	7 years 2 months 12 days		6 years 7 months 6 days
2019 Non-Executive Director Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized	9,000,000
Unvested	$ 2.83
Weighted average per share fair value of options, vesting	$ 1.54
2019 Non-Executive Director Equity Incentive Plan [Member] \| Options Vesting [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share options, Contractual term	10 years
Number of options, nonvested			73,336
Unvested			$ 0.84
Weighted average per share fair value of options, vesting	$ 2.08	$ 0.9
Weighted average contractual life of options, outstanding	7 years 10 months 24 days		8 years
Weighted average contractual life of options, vested	7 years 8 months 12 days		7 years 10 months 24 days
Previous Share Option Plans [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average contractual life of options, outstanding	1 year 3 months 18 days		1 year 9 months 18 days
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average per share fair value of options, vesting	$ 1.01
Weighted average contractual life of options, outstanding	2 years 9 months 18 days
Restricted Stock Units [Member] \| Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average contractual life of options, outstanding	3 years
Performance Based Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average per share fair value of options, vesting	$ 0.65
Weighted average contractual life of options, outstanding	7 months 6 days
Deferred Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unvested	$ 3.87
Weighted average per share fair value of options, vesting	$ 1.17
Deferred Restricted Stock Units [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Payment tem	180 days

Share Based Compensation - Summary of Share Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total	$ 2,088	$ 943	$ 4,138	$ 2,576
2019 EIP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total	1,568	684	3,027	1,889
2019 NED EIP
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Total	$ 520	$ 259	$ 1,111	$ 687

Share Based Compensation - Summary of Option Activity and Related Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2024
2019 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Options, Begining Balance	9,595,161
Granted	2,477,404
Forfeited	(47,288)
Exercised	(415,568)
Expired	(5,000)
Number of Options, Ending Balance	11,604,709
Vested	4,957,767
Unvested	6,646,942
Weighted Average Exercise Price, Beginning Balance	$ 1.63
Granted	3.35
Forfeited	2.01
Exercised	1.51
Expired	3.32
Weighted Average Exercise Price, Ending Balance	2
Vested	$ 1.95
Unvested	2.03
Weighted Average Grant Date Fair Value, Beginning Balance	$ 1.41
Granted	2.6
Forfeited	1.69
Exercised	1.27
Expired	2.93
Weighted Average Grant Date Fair Value, Ending Balance	1.66
Vested	1.66
Unvested	$ 1.67
Aggregate Intrinsic Value, Beginning Balance	$ 8,133,000
Granted	0
Forfeited	69,000
Exercised	760,000
Expired	0
Aggregate Intrinsic Value, Ending Balance	18,975,000
Vested	8,566,000
Nonvested	$ 10,409,000
2019 Non-Executive Director Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Options, Begining Balance	1,355,087
Granted	360,000
Number of Options, Ending Balance	1,715,087
Vested	1,475,087
Unvested	240,000
Weighted Average Exercise Price, Beginning Balance	$ 1.66
Granted	3.87
Weighted Average Exercise Price, Ending Balance	2.12
Vested	$ 1.84
Unvested	3.87
Weighted Average Grant Date Fair Value, Beginning Balance	$ 1.43
Granted	2.83
Weighted Average Grant Date Fair Value, Ending Balance	1.72
Vested	1.54
Unvested	$ 2.83
Aggregate Intrinsic Value, Beginning Balance	$ 1,166,000
Granted	0
Aggregate Intrinsic Value, Ending Balance	2,700,000
Vested	2,700,000
Nonvested	$ 0
Previous Share Option Plans [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of Options, Begining Balance	1,572,358
Expired	(152,491)
Number of Options, Ending Balance	1,419,867
Weighted Average Exercise Price, Beginning Balance	$ 9.22
Expired	0
Weighted Average Exercise Price, Ending Balance	9.24
Weighted Average Grant Date Fair Value, Beginning Balance	8.19
Expired	0
Weighted Average Grant Date Fair Value, Ending Balance	$ 9.05
Aggregate Intrinsic Value, Beginning Balance	$ 0
Expired	0
Aggregate Intrinsic Value, Ending Balance	$ 0

Share Based Compensation - Summary of Assumptions used in Black-Scholes Option Pricing Model (Details) - Share-Based Payment Arrangement [Member] - USD ($)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
2019 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Market value of ADSs	$ 3.35	$ 1.01
Risk-free interest rate (%)	4.02%	3.43%
Expected life (years)	6 years 3 months	10 years
Expected volatility (%)	90.78%	98.06%
Expected dividends	$ 0	$ 0
2019 Non-Executive Director Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Market value of ADSs	$ 3.87	$ 0.94
Risk-free interest rate (%)	4.08%	3.36%
Expected life (years)	5 years 3 months	10 years
Expected volatility (%)	90.67%	97.94%
Expected dividends	$ 0	$ 0

Share Based Compensation - Summary of Restricted Stock Unit Activity and Related Information (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of RSUs, Beginning Balance \| shares	489,225
Granted \| shares	204,914
Vested \| shares	(142,583)
Forfeited \| shares	(23,533)
Number of RSUs, Ending Balance \| shares	528,023
Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 1.04
Granted \| $ / shares	3.36
Vested \| $ / shares	1.01
Forfeited \| $ / shares	1.36
Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 1.93
Aggregate intrinsic value, Beginning Balance \| $	$ 1,130
Granted \| $	0
Vested \| $	480
Forfeited \| $	0
Aggregate intrinsic value, Ending Balance \| $	$ 1,901
Deferred Restricted Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of RSUs, Beginning Balance \| shares	729,982
Granted \| shares	125,393
Forfeited \| shares	0
Number of RSUs, Ending Balance \| shares	855,375
Vested \| shares	771,778
Unvested \| shares	83,597
Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 1.01
Granted \| $ / shares	3.87
Vested \| $ / shares	1.17
Forfeited \| $ / shares	0
Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	1.43
Unvested \| $ / shares	$ 3.87
Aggregate intrinsic value, Beginning Balance \| $	$ 1,686
Granted \| $	485
Vested \| $	2,778
Forfeited \| $	0
Aggregate intrinsic value, Ending Balance \| $	3,079
Nonvested \| $	$ 301

Share Based Compensation - Summary of Performance Based Restricted Stock Unit (PSUs) Activity and Related Information (Details) - Performance Based Restricted Stock Units $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of RSUs, Beginning Balance \| shares	1,338,150
Granted \| shares	0
Forfeited \| shares	0
Vested \| shares	(802,890)
Number of RSUs, Ending Balance \| shares	535,260
Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 0.61
Granted \| $ / shares	0
Forfeited \| $ / shares	0
Vested \| $ / shares	0.65
Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 0.54
Aggregate intrinsic value, Beginning Balance \| $	$ 3,091
Granted \| $	0
Forfeited \| $	0
Vested \| $	2,798
Aggregate intrinsic value, Ending Balance \| $	$ 1,927

Loss per Share - Schedule of Weighted Average Number of Ordinary Shares Outstanding and The Effect of Dilutive Ordinary Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net loss	$ (12,255)	$ (8,951)	$ (1,751)	$ (12,076)	$ (21,208)	$ (13,827)
Net loss per share - basic	$ (0.02)		$ 0		$ (0.03)	$ (0.02)
Net loss per share - diluted	$ (0.02)		$ 0		$ (0.03)	$ (0.02)
Weighted-average number of shares used in computing net loss per share - basic	711,770,804		628,421,064		706,407,371	626,185,695
Weighted-average number of shares used in computing net loss per share - diluted	711,770,804		628,421,064		706,407,371	626,185,695

Loss per Share - Schedule of Potentially Dilutive Shares Were Not Included In The Calculation of Diluted Shares Outstanding (Details) - shares	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,676,300	6,690,750
DRSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,276,875	3,637,905
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	73,698,315	64,289,090
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,640,115	2,738,750
Convertibale loan notes \| Private Placement Loan Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	24,279,659
Convertibale loan notes \| Novartis [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	16,308,364	15,000,137
Warrants to purchase ordinary shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	7,539,129	7,539,129
AstraZeneca milestones potentially payable in equity
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,349,692	1,349,692

Commitments and Contingencies (Additional Information) (Details) - USD ($) $ in Millions		1 Months Ended
	Jun. 17, 2024	Oct. 31, 2017	Jun. 30, 2024
Loss Contingencies [Line Items]
Shares issued for upfront payment	12,531,300
AstraZeneca [Member]
Loss Contingencies [Line Items]
Asset acquisition		$ 5.0
AstraZeneca [Member] \| License Agreement [Member]
Loss Contingencies [Line Items]
Asset acquisition		$ 3.0
Shares issued for upfront payment		490,798
Maximum \| AstraZeneca [Member]
Loss Contingencies [Line Items]
Maximum amount		$ 115.5
CMOs [Member]
Loss Contingencies [Line Items]
Manufacturing commitments			$ 2.4

Related Party Disclosures (Additional Information) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Related Party Transactions [Abstract]
Related Party Transaction	$ 0	$ 0	$ 0	$ 0

Subsequent Events (Additional Information) (Details) $ in Millions	Jun. 30, 2024 USD ($)
Contingent Value Rights [Member]
Subsequent Event [Line Items]
Amounts payable	$ 0

Mereo BioPharma (NASDAQ:MREO)
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