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

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)


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

For the quarterly period ended December 27, 2024


o			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: 001-42176

Amentum Holdings, Inc.

(Exact name of registrant as specified in its charter)


Delaware			99-0622272
(State or other jurisdiction of			(I.R.S. Employer
incorporation or organization)			Identification No.)

4800 Westfields Blvd., Suite #400

Chantilly, Virginia 20151

(Address of principal executive offices)

(703) 579-0410

(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
Common Stock, par value $0.01 per share	AMTM	New York Stock Exchange

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 þ No o

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 þ No o

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a 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	o	Accelerated filer	o
Non-accelerated filer	þ	Smaller reporting company	o
		Emerging growth company	o

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. o

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

As of January 31, 2025, there were 243,302,426 shares outstanding of Amentum Holdings, Inc. common stock, par value of $0.01 per share.

Amentum Holdings, Inc.


PART I:	FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)	4
	Condensed Consolidated Balance Sheets	4
	Condensed Consolidated Statements of Operations	5
	Condensed Consolidated Statements of Comprehensive Income (Loss)	6
	Condensed Consolidated Statements of Shareholders' Equity	7
	Condensed Consolidated Statements of Cash Flows	8
	Notes to Condensed Consolidated Financial Statements	9
	Note 1 — Basis of Presentation	9
	Note 2 — Recent Accounting Pronouncements	9
	Note 3 — Acquisition	10
	Note 4 — Revenues	10
	Note 5 — Contract Balances	12
	Note 6 — Sales of Receivables	12
	Note 7 — Goodwill and Intangible Assets	13
	Note 8 — Income Taxes	13
	Note 9 — Debt	13
	Note 10 — Joint Ventures	14
	Note 11 — Accumulated Other Comprehensive Income (Loss)	15
	Note 12 — Segment Information	16
	Note 13 — Earnings (Loss) Per Share	17
	Note 14 — Legal Proceedings and Commitments and Contingencies	17
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	18
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	23
Item 4.	Controls and Procedures	23
PART I I :	OTHER INFORMATION	24
Item 1.	Legal Proceedings	24
Item 1A.	Risk Factors	24
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	24
Item 3.	Defaults Upon Senior Securities	24
Item 4.	Mine Safety Disclosures	24
Item 5.	Other Information	24
Item 6.	Exhibits	24
	Signatures	25

PART I

FINANCIAL INFORMATION

Item 1. Financial Statements (Unaudited)

AMENTUM HOLDINGS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

(in millions, except per share data)


	December 27, 2024		September 27, 2024

ASSETS
Current assets:
Cash and cash equivalents	$	522	$	452
Accounts receivable, net	2,405		2,401
Prepaid expenses and other current assets	213		231
Total current assets	3,140		3,084
Property and equipment, net	140		144

Equity method investments	124		123
Goodwill	5,588		5,556
Intangible assets, net	2,503		2,623
Other long-term assets	424		444
Total assets	$	11,919	$	11,974
LIABILITIES
Current liabilities:
Current portion of long-term debt	$	44	$	36
Accounts payable	726		764
Accrued compensation and benefits	691		696
Contract liabilities	143		113
Other current liabilities	367		356

Total current liabilities	1,971		1,965
Long-term debt, net of current portion	4,636		4,643

Deferred tax liabilities	347		370
Other long-term liabilities	402		444
Total liabilities	7,356		7,422
Commitments and contingencies (Note 14)
SHAREHOLDERS' EQUITY
Common stock, $0.01 par value, 1,000,000,000 shares authorized; 243,302,257 shares issued and outstanding at December 27, 2024 and 243,302,173 shares issued and outstanding at September 27, 2024.	2		2
Additional paid-in capital	4,965		4,962
Retained deficit	(515)		(527)
Accumulated other comprehensive income	23		23
Total Amentum shareholders' equity	4,475		4,460
Non-controlling interests	88		92
Total shareholders' equity	4,563		4,552
Total liabilities and shareholders' equity	$	11,919	$	11,974

See notes to unaudited condensed consolidated financial statements

AMENTUM HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)

(in millions, except per share data)


	Three Months Ended
	December 27, 2024		December 29, 2023
Revenues	$	3,416	$	1,983
Cost of revenues	(3,055)		(1,789)
Selling, general, and administrative expenses	(130)		(67)
Amortization of intangibles	(120)		(56)
Equity earnings of non-consolidated subsidiaries	21		15

Operating income	132		86
Interest expense and other, net	(87)		(111)


Income (loss) before income taxes	45		(25)
Provision for income taxes	(24)		(14)
Net income (loss)	21		(39)
Less: net income attributable to non-controlling interests	(9)		(2)
Net income (loss) attributable to common shareholders	$	12	$	(41)

Earnings (loss) per share:
Basic	$	0.05	$	(0.46)
Diluted	$	0.05	$	(0.46)

See notes to unaudited condensed consolidated financial statements

AMENTUM HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(UNAUDITED)

(in millions)


	Three Months Ended
	December 27, 2024		December 29, 2023
Net income (loss)	$	21	$	(39)
Other comprehensive income (loss):
Net unrealized gain (loss) on interest rate swaps	22		(29)
Foreign currency translation adjustments	(18)		6

Other comprehensive income (loss)	4		(23)
Income tax (provision) benefit related to items of other comprehensive income (loss)	(4)		4
Other comprehensive loss, net of tax	—		(19)
Comprehensive income (loss)	21		(58)
Non-controlling interests	(9)		(2)
Comprehensive income (loss) attributable to common shareholders	$	12	$	(60)

See notes to unaudited condensed consolidated financial statements

AMENTUM HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY

(UNAUDITED)

(in millions)


	Additional Paid-in Capital		Retained Deficit		Accumulated Other Comprehensive Income (Loss)		Total Shareholders' Equity Attributable to Amentum Holdings, Inc.		Non-controlling Interests		Total Shareholders' Equity

Balance at September 29, 2023	$	772	$	(445)	$	48	$	375	$	41	$	416
Net loss	—		(41)		—		(41)		2		(39)
Other comprehensive loss, net of tax	—		—		(19)		(19)		—		(19)


Equity based compensation and other	3		—		—		3		(3)		—
Balance at December 29, 2023	$	775	$	(486)	$	29	$	318	$	40	$	358


	Common Stock			Additional Paid-in Capital		Retained Deficit		Accumulated Other Comprehensive Income (Loss)		Total Shareholders' Equity Attributable to Amentum Holdings, Inc.		Non-controlling Interests		Total Shareholders' Equity
	Shares	Amount




















Balance at September 27, 2024	243	$	2	$	4,962	$	(527)	$	23	$	4,460	$	92	$	4,552
Net income	—	—		—		12		—		12		9		21



Distributions to non-controlling interests	—	—		—		—		—		—		(13)		(13)
Equity based compensation and other	—	—		3		—		—		3		—		3
Balance at December 27, 2024	243	$	2	$	4,965	$	(515)	$	23	$	4,475	$	88	$	4,563

See notes to unaudited condensed consolidated financial statements

AMENTUM HOLDINGS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in millions)


	Three Months Ended
	December 27, 2024		December 29, 2023
Cash flows from operating activities
Net income (loss)	$	21	$	(39)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	9		7
Amortization of intangibles	120		56
Amortization of deferred loan costs and original issue discount	3		5

Derivative instruments	3		15
Equity earnings of non-consolidated subsidiaries	(21)		(15)
Distributions from equity method investments	21		17
Deferred income taxes	(15)		(12)
Equity-based compensation	3		1

Other	(1)		(2)
Changes in assets and liabilities, net of effects of business acquisition:
Accounts receivable, net	(27)		(103)
Prepaid expenses and other assets	35		8
Accounts payable, contract liabilities, and other current liabilities	(31)		(27)
Accrued employee compensation and benefits	(6)		8
Other long-term liabilities	(4)		(2)
Net cash provided by (used in) operating activities	110		(83)
Cash flows from investing activities

Payments for property and equipment	(8)		(2)
Contributions to equity method investments	(1)		—

Other	1		(1)
Net cash used in investing activities	(8)		(3)
Cash flows from financing activities
Borrowings on revolving credit facilities	210		200
Payments on revolving credit facilities	(210)		(200)

Repayments of borrowings under the credit agreement	—		(8)



Repayments of borrowings under other agreements	(2)		(3)


Distributions to non-controlling interests	(13)		(1)
Other	(1)		(2)
Net cash used in financing activities	(16)		(14)
Effect of exchange rate changes on cash	(16)		6
Net change in cash and cash equivalents	70		(94)
Cash and cash equivalents, beginning of period	452		305
Cash and cash equivalents, end of period	$	522	$	211
Supplemental disclosure of cash flow information

Income (taxes paid) tax refunds received, net of receipts	$	(6)	$	2
Interest paid	$	(39)	$	(94)

See notes to unaudited condensed consolidated financial statements

AMENTUM HOLDINGS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Note 1 — Basis of Presentation

Amentum Holdings, Inc. (collectively with its subsidiaries, “we,” “us,” “our,” “Amentum,” or the “Company”) is a global advanced engineering and technology solutions provider to a broad base of U.S. and allied government agencies, supporting programs of critical national importance across energy and environmental, intelligence, space, defense, civilian and commercial end-markets. We offer a broad reach of capabilities including intelligence and counter threat solutions, data fusion and analytics, engineering and integration, environmental solutions, advanced test, training and readiness, and citizen solutions. As a leading provider of differentiated technology solutions, we have built a repertoire of deep customer knowledge, enabling us to engage our customers across multiple capabilities and markets.

During the three months ended December 27, 2024, we announced the realignment of our reporting structure, which resulted in the identification of two reportable segments: Digital Solutions (“DS”) and Global Engineering Solutions (“GES”). The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients. The Global Engineering Solutions segment provides large-scale environmental remediation, clean energy, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations. As a result of this change, prior year segment disclosures have been recast to reflect the current reportable segment structure.

On September 27, 2024, the spin-off of the Jacobs Solutions Inc. (“Jacobs”) Critical Mission Solutions business and portions of the Jacobs Divergent Solutions business (and, together with the Critical Mission Solutions business, referred to as the “CMS Business” or “CMS”) merged with Amentum Parent Holdings LLC (collectively, the “Transaction”) with the surviving entity renamed Amentum Holdings, Inc.

Amentum Parent Holdings LLC is considered the Company’s predecessor, and the historical financial statements of Amentum Parent Holdings LLC prior to September 27, 2024 are reflected in this Quarterly Report on Form 10-Q as the Company’s historical financial statements. Accordingly, the financial results of the Company prior to September 27, 2024 do not include the financial results of CMS, and current and future results will not be comparable to historical results.

The accompanying unaudited condensed consolidated financial statements of the Company include the assets, liabilities, results of operations, comprehensive income (loss) and cash flows for the Company, including its wholly-owned subsidiaries and joint ventures that are majority-owned or otherwise controlled by the Company. Certain information and note disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted, although the Company believes that the disclosures made are adequate to make the information presented not misleading. All intercompany transactions and balances have been eliminated in consolidation.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments and reclassifications (all of which are of a normal, recurring nature) that are necessary for the fair presentation of the periods presented. It is suggested that these unaudited condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s latest annual report for the fiscal year ended September 27, 2024. The results of operations for the three months ended December 27, 2024 are not necessarily indicative of the results to be expected for any subsequent interim period or for the full fiscal year.

Note 2 — Recent Accounting Pronouncements

Accounting Standards Updates Issued but Not Yet Adopted

In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements. This update requires disclosure of significant segment expenses and other segment items in annual and interim periods. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The amendment requires retrospective application to all prior periods presented in the financial statements and early adoption is permitted. We are currently evaluating the impacts of the new standard on our consolidated financial statements.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance transparency and usefulness of income tax disclosures. This update requires disaggregated information about an entity’s effective tax rate reconciliation as well as information on income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024, and may be applied on a prospective or retrospective basis. Early adoption is permitted. We are currently evaluating the impacts of the new standard on our consolidated financial statements.

Note 3 — Acquisition

On September 27, 2024, the Company completed its merger with CMS, a leading provider of mission-critical, technology-driven services in government and commercial markets, in a Reverse Morris Trust transaction. Immediately following the Transaction, the Company had approximately 243 million issued and outstanding shares of common stock, of which Jacobs and its shareholders owned 58.5% of the issued and outstanding shares of common stock, and Amentum Joint Venture LP, our previous parent company (“AJVLP” and “Amentum Equityholder”) owned 37.0%. Subsequently, Amentum Equityholder distributed its shares of our common stock to certain parties (collectively, “Sponsor Stockholder”). Further, 4.5% of the issued and outstanding shares of common stock have been placed in escrow, to be released and delivered in the future to Jacobs and its shareholders or to Sponsor Stockholder, depending on the achievement of certain fiscal year 2024 targets by the CMS Business (“Additional Merger Consideration”). The final determination of this Additional Merger Consideration is expected to be completed during the measurement period.

The Transaction was accounted for as a business combination. The Company assessed the fair value of the identifiable intangible assets including customer relationships and backlog, which were valued using the excess earnings method of the income approach. This method requires several judgments and assumptions to determine the fair value of the intangible assets including expected future cash flows, weighted-average cost of capital, discount rates, useful lives of assets and expected long-term growth rates. The goodwill recognized was attributable to the synergies expected to be achieved by combining the businesses of Amentum and CMS, expected future contracts and the acquired workforce. The goodwill is partially deductible for tax purposes.

The purchase price was allocated, on a preliminary basis, to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date, with the excess purchase consideration recorded as goodwill. The Company is still evaluating the determination of fair values allocated to various assets and liabilities, including, but not limited to, intangible assets, accounts receivable, other current assets, property and equipment, equity method investments and joint ventures, other long-term assets, income taxes, deferred taxes, accounts payables, other current liabilities, contract liabilities, other long-term liabilities, non-controlling interests, additional merger consideration and goodwill. The allocation of the purchase price is preliminary and subject to change as the Company continues to obtain and assess relevant information that existed as of the acquisition date, including but not limited to, information pertaining to CMS’ legal proceedings, reserves, income taxes, contracts with customers, and pre-acquisition contingencies. Additionally, in connection and in accordance with the terms of the spin-off, prior to the spin-off and Transaction, CMS provided a cash payment to Jacobs of approximately $911 million, after adjustments based on the levels of cash, debt and working capital in the CMS Business, which is subject to final settlement between the parties, as set forth in the Merger Agreement, and may result in changes to the purchase price allocation. The Company expects to have sufficient information available to resolve these items within one year of the CMS acquisition date. During the three months ended December 27, 2024, the Company made fair value adjustments which increased goodwill and other current liabilities by $32 million and $20 million, respectively, and decreased accounts receivable and deferred tax liabilities by $22 million and $10 million, respectively.

The estimated fair value of acquired backlog of $270 million is amortized on an accelerated basis over approximately 1 year and the estimated fair value of customer relationship intangible assets of $1,590 million is amortized on an accelerated basis over approximately 14 years. The fair value attributed to these intangible assets acquired was based on assumptions and other information compiled by management, including independent valuations that utilized established valuation techniques, and thus represents a Level 3 fair value measurement. The income approach was primarily used to value the intangible assets, consisting primarily of acquired program and contract intangibles and backlog. The income approach indicates value for an asset based on the present value of cash flow projected to be generated by the asset. Projected cash flow is discounted at a rate of return that reflects the relative risk of achieving the cash flow and the time value of money.

Note 4 — Revenues

Disaggregation of Revenues

The Company disaggregates revenues by customer, contract type, prime contractor versus subcontractor, geographic location and whether the solution provided is primarily Digital Solutions or Global Engineering Solutions. These categories represent how the nature, amount, timing, and uncertainty of revenues and cash flows are affected.

Disaggregated revenues by customer-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Department of Defense and U.S. Intelligence Community	$	722	$	1,046	$	1,768	$	351	$	952	$	1,303
Other U.S. Government Agencies	416		600		1016		87		373		460
Commercial and International	148		484		632		21		199		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by contract-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Cost-plus-fee	$	785	$	1,381	$	2,166	$	219	$	1,035	$	1,254
Fixed-price	359		472		831		155		354		509
Time-and-materials	142		277		419		85		135		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by prime contractor versus subcontractor were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Prime contractor	$	1,164	$	1,878	$	3,042	$	409	$	1,351	$	1,760
Subcontractor	122		252		374		50		173		223
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Revenues by geographic location are reported by the country in which the work is performed and were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
United States	$	1,222	$	1,263	$	2,485	$	384	$	1,063	$	1,447
International	64		867		931		75		461		536
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Changes in Estimates on Contracts

Changes in estimated contract earnings at completion using the cumulative catch-up method of accounting were recognized in revenues as follows:


	Three Months Ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Favorable earnings at completion adjustments	$	32	$	24
Unfavorable earnings at completion adjustments	(24)		(17)
Net favorable adjustments	$	8	$	7

Impact on diluted earnings per share attributable to common shareholders (1)	$	0.02	$	0.07

(1) The impact on diluted loss per share attributable to common shareholders is calculated using our statutory rate.

Remaining Performance Obligations

As of December 27, 2024, we had a remaining performance obligations balance of $12.3 billion and expect to recognize approximately 68% and 86% of the remaining performance obligations balance as revenues over the next 12 and 24 months, respectively, with the remainder to be recognized thereafter.

Note 5 — Contract Balances

The Company's contract balances consisted of the following (in millions):


		As of
Description of Contract Related Balance	Classification	December 27, 2024		September 27, 2024
Billed and billable receivables	Accounts receivable, net	$	1,443	$	1,378
Contract assets	Accounts receivable, net	927		986
Related party receivables	Accounts receivable, net	35		37
Long-term contract assets	Other long-term assets	138		138
Contract liabilities - deferred revenues and other contract liabilities	Contract liabilities	(143)		(113)

Contract assets primarily relate to accruals for reimbursable costs and fees in which our right to consideration is conditional. Long-term contract assets relate to a prior acquisition and are discussed further in Note 14 — Legal Proceedings and Commitments and Contingencies.

The Company has related party receivables due from our equity method investments, discussed further in Note 10 — Joint Ventures.

We recognized revenues of $65 million and $76 million during the three months ended December 27, 2024 and December 29, 2023, respectively, that was included in Contract liabilities as of September 27, 2024 and September 29, 2023, respectively.

Note 6 — Sales of Receivables

In March 2024, we entered into a Master Accounts Receivable Purchase Agreement (“MARPA”) with MUFG Bank, Ltd., (the “Purchaser”) for the sale of certain designated eligible U.S. Government receivables. Under the MARPA, the Company can sell certain eligible receivables without recourse for any U.S. Government credit risk.

The Company's MARPA activity consisted of the following (in millions):


	As of and for the Three Months Ended December 27, 2024

Beginning balance:	$	177
Sales of receivables	952
Cash collections	(945)
Outstanding balance sold to Purchaser (1)	184
Cash collected, not remitted to Purchaser (2)	(18)
Remaining sold receivables	$	166

(1) For the three months ended December 27, 2024, the Company recorded a net cash inflow of $7 million in its cash flows from operating activities, respectively, from sold receivables. MARPA cash flows are calculated as the change in the outstanding balance during the fiscal year.

(2) Includes the cash collected on behalf of but not yet remitted to the Purchaser as of December 27, 2024. This balance is included in Other accrued liabilities as of the balance sheet date.

Note 7 — Goodwill and Intangible Assets

Goodwill

The table below presents changes in the carrying amount of goodwill for the periods presented:


(Amounts in millions)	Total
Balance as of September 27, 2024	$	5,556
Acquisition of CMS (1)	32
Balance as of December 27, 2024	$	5,588

(1) Represents changes to goodwill resulting from measurement period adjustments recorded in fiscal year 2025 associated with the acquisition of CMS purchase price allocation.

During the quarter ended December 27, 2024, we performed an interim goodwill impairment test both before and after the business realignment and did not record an impairment charge as a result of the test.

Intangible Assets

Intangible assets, net consisted of the following:


	December 27, 2024						September 27, 2024
(Amounts in millions)	Gross Carrying Value		Accumulated Amortization		Net		Gross Carrying Value		Accumulated Amortization		Net
Backlog	$	931	$	(628)	$	303	$	931	$	(552)	$	379
Customer relationship intangible assets	2,781		(594)		2,187		2,781		(550)		2,231
Capitalized software	23		(10)		13		23		(10)		13
Total intangible assets, net	$	3,735	$	(1,232)	$	2,503	$	3,735	$	(1,112)	$	2,623

Amortization expense was $120 million and $56 million for the three months ended December 27, 2024 and December 29, 2023, respectively.

Note 8 — Income Taxes

The effective tax rate was 53.3% and (56.0)% for the three months ended December 27, 2024 and December 29, 2023, respectively. The most significant item contributing to the difference between the statutory U.S. federal corporate tax rate of 21.0% and the Company’s effective tax rate for the three months ended December 27, 2024 and December 29, 2023 was an increase in the valuation allowance against the deferred tax asset related to disallowed interest expense of $12 million and $23 million, respectively.

Note 9 — Debt

Debt consisted of the following:


	As of
(Amounts in millions)	December 27, 2024		September 27, 2024
Term Loan	$	3,750	$	3,750
Senior notes	1,000		1,000
Other	15		17
Total debt	4,765		4,767
Unamortized original issue discount and unamortized deferred financing costs	(85)		(88)
Total debt, net of original issue discount and deferred financing costs	4,680		4,679
Less current portion of long-term debt	(44)		(36)
Total long-term debt, net of current portion	$	4,636	$	4,643

As amended, the Company’s senior secured credit facility (the “Credit Facility”) consists of a seven year, $3,750 million term facility (“Term Loan”) and a five year, $850 million revolving facility (“Revolver”), including a $200 million letter of credit subfacility and a $100 million swingline subfacility.

The interest rates applicable to the Term Loan are floating interest rates equal to an Alternate Base Rate or Adjusted Term Secured Overnight Financing Rate plus an applicable margin based upon net leverage ratio. The Term Loan matures on September 27, 2031 and requires quarterly principal amortization payments of $9 million commencing March 31, 2025 with the remainder of the principal thereunder being due at maturity. The Revolver matures on September 27, 2029.

As of December 27, 2024 and September 27, 2024, the available borrowing capacity under the Credit Facility was $788 million and $808 million, respectively, and included $62 million and $42 million, respectively, in issued letters of credit. As of December 27, 2024 and September 27, 2024, there were no amounts borrowed under the Revolver.

In August 2024, the Company completed an offering of $1,000 million in aggregate principal amount of 7.250% senior notes due August 1, 2032 (the “Senior Notes”). Interest is payable on February 1 and August 1 of each year, commencing on February 1, 2025.

The Credit Facility and the Senior Notes are guaranteed by substantially all of our wholly owned material domestic restricted subsidiaries, subject to customary exceptions set forth in the credit agreement and indenture, respectively.

Each of the credit agreement and indenture requires us to comply with certain representations and warranties, customary affirmative and negative covenants and, in the case of the Revolver, under certain circumstances, a financial covenant. We were in compliance with all covenants as of December 27, 2024.

Cash Flow Hedges

The Company utilizes derivative financial instruments to manage interest rate risk related to its variable rate debt. The Company’s objective is to manage its exposure to interest rate movements and reduce volatility of interest expense. The Company entered into several interest rate swaps with an aggregate notional value of $1.9 billion that were designated as cash flow hedges, in which the Company will pay at the fixed rate and receive payment at a floating rate indexed to the three-month term SOFR through maturity. The swaps mature at various dates through January 31, 2027. The change in fair value of the interest rate swaps is presented within accumulated other comprehensive income on our consolidated balance sheet and subsequently reclassified into interest expense and other, net on our consolidated statements of income and comprehensive loss in the period when the hedged transaction affects earnings.

Note 10 — Joint Ventures

The Company’s joint ventures provide services to customers including program management and operations and maintenance services. Joint ventures, the combination of two or more partners, are generally formed for a specific project. Management of the joint venture is typically controlled by a joint venture executive committee, comprised of representatives from the joint venture partners. The joint venture executive committee normally provides management oversight and controls decisions which could have a significant impact on the joint venture.

We account for joint ventures in accordance with ASC 810, Consolidation. The Company analyzes its joint ventures and classifies them as either:

•a VIE that must be consolidated because the Company is the primary beneficiary or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or

•a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest.

The following table presents selected financial information for our consolidated joint ventures that are VIEs as of December 27, 2024 and September 27, 2024:


	As of
(Amounts in millions)	December 27, 2024		September 27, 2024
Cash and cash equivalents	$	143	$	160
Current assets	305		322
Non-current assets	3		2
Total assets	$	451	$	484

Current liabilities	$	160	$	190
Non-current liabilities	1		1
Total liabilities	161		191

Total Amentum equity	226		228
Non-controlling interests	64		65
Total equity	290		293
Total liabilities and equity	$	451	$	484

The following table presents selected financial information for our consolidated joint ventures that are VIEs for the three months ended December 27, 2024 and December 29, 2023:


	For the three months ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Revenues	$	376	$	69
Cost of revenues	(336)		(58)
Net income	39		10

The Company has an ownership share in approximately 25 active joint ventures that are accounted for as equity method investments and the Company’s ownership percentages generally range from 10% to 51%. Related party receivables due from our equity method investments were $35 million and $37 million as of December 27, 2024 and September 27, 2024, respectively. These receivables are a result of items purchased and services rendered by us on behalf of our equity method investments. We have assessed these receivables as having minimal collection risk based on our historic experience with these joint ventures and our inherent influence through our ownership interest. The related party revenues earned from our equity method investments was $44 million and $28 million for the three months ended December 27, 2024 and December 29, 2023, respectively.

Many of our joint ventures only perform on a single contract. The modification or termination of a contract under a joint venture could trigger an impairment in the fair value of our investment in these entities. In the aggregate, our maximum exposure to losses was $124 million related to our equity method investments as of December 27, 2024.

Note 11 — Accumulated Other Comprehensive Income (Loss)

The accumulated balances and reporting period activities for the three months ended December 27, 2024 and December 29, 2023 related to accumulated other comprehensive income (loss) are summarized as follows:


	Gain (Loss) on Derivative Instruments		Foreign Currency Translation Adjustments		Pension Related Adjustments		Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss)


(Amounts in millions)
Balance at September 27, 2024	$	(22)	$	3	$	55	$	(13)	$	23
Other comprehensive (loss) income before reclassification	25		(18)		—		(4)		3
Amounts reclassified from accumulated other comprehensive (loss) income	(3)		—		—		—		(3)
Balance at December 27, 2024	$	—	$	(15)	$	55	$	(17)	$	23


	Gain (Loss) on Derivative Instruments		Foreign Currency Translation Adjustments		Pension Related Adjustments		Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss)


(Amounts in millions)
Balance at September 29, 2023	$	25	$	(5)	$	46	$	(18)	$	48
Other comprehensive (loss) income before reclassification	(27)		6		—		4		(17)
Amounts reclassified from accumulated other comprehensive (loss) income	(2)		—		—		—		(2)
Balance at December 29, 2023	$	(4)	$	1	$	46	$	(14)	$	29

Note 12 — Segment Information

In the first quarter of fiscal year 2025, we amended our organizational structure, which resulted in the identification of two reportable segments: Digital Solutions (“DS”) and Global Engineering Solutions (“GES”).

The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients.

The Global Engineering Solutions segment provides large-scale environmental remediation, clean energy, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations.

The presentation of financial results as two reportable segments is consistent with the way the Company operates its business and the manner in which our chief operating decision maker (“CODM”), currently our Chief Executive Officer, manages the operations of the Company for purposes of allocating resources and assessing performance. The CODM evaluates the performance of our segments based on revenues and Adjusted EBITDA. Prior year performance measures have been recast to reflect the current reportable segment structure.

The Company’s segment revenues were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Adjusted EBITDA is most comparable to net income (loss) attributable to common shareholders prepared based on GAAP. The Company defines Adjusted EBITDA as net income (loss) attributable to common shareholders adjusted for interest expense and other, net, provision for income taxes, depreciation and amortization, and certain discrete items that are not considered in the evaluation of ongoing operating performance. These discrete items include acquisition, transaction, and integration costs, non-cash gains and losses, loss on extinguishment of debt, utilization of certain fair market value adjustments assigned in purchase accounting, and share-based compensation. While we believe Adjusted EBITDA is a useful metric in evaluating operating performance by allowing better evaluation of underlying segment performance and better period-to-period comparability, it is not a metric defined by GAAP and may not be comparable to non-GAAP metrics presented by other companies.

The following table reconciles segment Adjusted EBITDA to net income (loss) attributable to common shareholders:


	Three months ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Adjusted EBITDA by segment
DS	$	100	$	38
GES	162		116
Adjusted EBITDA attributable to Amentum Holdings, Inc.	262		154
Depreciation expense	(9)		(7)
Amortization of intangibles	(120)		(56)
Interest expense and other, net	(87)		(111)
Non-controlling interests	9		2
Acquisition, transaction and integration costs1	(9)		(7)
Utilization of fair market value adjustments2	2		1
Share-based compensation3	(3)		(1)
Income (loss) before income taxes	45		(25)
Provision for income taxes	(24)		(14)
Net income (loss)	21		(39)
Non-controlling interests	(9)		(2)
Net income (loss) attributable to common shareholders	$	12	$	(41)

(1) Represents acquisition, transaction and integration costs, including severance, retention, and other adjustments related to acquisition and integration activities.

(2) Represents the periodic utilization of the fair market value adjustments assigned to certain equity method investments and non-controlling interests based on the remaining period of performance for the related contract.

(3) Represents non-cash compensation expenses recognized for share based arrangements.

Asset information by segment is not a key measure of performance used by the CODM.

Note 13 — Earnings (Loss) Per Share

For the three months ended December 29, 2023, the Company retrospectively adjusted the weighted average shares used in determining loss per share to reflect the conversion of the ownership interests of Amentum Parent Holdings LLC held by AJVLP that converted into 90,021,804 shares of the Company’s common stock at Transaction close. There were no anti-dilutive shares for the three months ended December 29, 2023.

Basic and diluted earnings (loss) per share are computed as follows (in millions, except per share data):


	For the three months ended
	December 27, 2024		December 29, 2023
Net income (loss) attributable to common shareholders	$	12	$	(41)
Weighted-average number of basic shares outstanding during the period	243		90

Weighted-average number of diluted shares outstanding during the period	243		90
Basic earnings (loss) per share	$	0.05	$	(0.46)
Diluted earnings (loss) per share	$	0.05	$	(0.46)

Note 14 — Legal Proceedings and Commitments and Contingencies

The Company is involved in various claims, disputes and administrative proceedings arising in the normal course of business. Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that an unfavorable result and/or liability will be incurred and the cost of the unfavorable result or liability can be reasonably estimated. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company’s operations and liquidity.

Payments to the Company on cost-plus-fee contracts are provisional and are subject to adjustments upon audit by the Defense Contract Audit Agency (“DCAA”). In management’s opinion, audit adjustments that may result from audits not yet completed or started are not expected to have a material adverse effect on the Company’s operations and liquidity.

Pending Litigation and Claims

Department of Energy Claims

In January 2020, the Company purchased assets and assumed liabilities associated with AECOM Energy & Construction, Inc. (the “Acquired Affiliate”) from AECOM (the “Seller”). At the time of the acquisition, the Acquired Affiliate had pending claims against the U.S. Department of Energy (“DOE”) related to a contract performed prior to the acquisition. The Company and the Seller agreed that all future claim recoveries and costs with the DOE would be split 10% to the Company and 90% to the Seller. Following the DOE’s denial of the claims, on December 20, 2020, the Acquired Affiliate filed an appeal of these decisions in the U.S. Court of Federal Claims. The Company has estimated and recorded $138 million within other long-term assets on the balance sheet and $125 million within other long-term liabilities on the balance sheet representing the Company’s payable to the Seller related to this matter. No changes to these amounts have been recorded since the acquisition. The Company intends to cooperate with the Seller in the pursuit of all claimed amounts but can provide no certainty that the Company will recover the claims. The Company does not believe any additional incurred claims or costs related to this matter will have a material adverse effect on the Company’s results of operations.

U.S. Government Investigations

We primarily sell our services to the U.S. Government. These contracts are subject to extensive legal and regulatory requirements, and we are occasionally the subject of investigations by various agencies of the U.S. Government who investigate whether our operations are being conducted in accordance with these requirements. Such investigations could result in administrative, civil or criminal liabilities, including repayments, fines or penalties being imposed on us, or could lead to suspension or debarment from future U.S. Government contracting. U.S. Government investigations often take years to complete and may result in adverse action against us. Any adverse actions arising from such matters could have a material effect on our ability to invoice and receive timely payment on our contracts, perform contracts or compete for contracts with the U.S. Government and could have a material effect on our operating performance. There are currently no investigations that are expected to have a material impact on our results of operations.

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

The following discussion and analysis of our unaudited condensed consolidated financial condition and results of operations should be read in conjunction with the Amentum Holdings, Inc. unaudited condensed consolidated financial statements, and the notes thereto, and other data contained elsewhere in this Quarterly Report on Form 10-Q. The following discussion and analysis should also be read in conjunction with our audited consolidated financial statements, and notes thereto, and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our Annual Report on Form 10-K for the year ended September 27, 2024. In addition, please see “Information Relating to Forward-Looking Statements” and “Item 1A. Risk Factors” within our Annual Report on Form 10-K for a discussion of the risks, uncertainties and assumptions associated with these statements.

References to “Amentum”, the “Company”, “we”, “our” or “us” refer to Amentum Holdings, Inc. and its subsidiaries unless otherwise stated or indicated by context.

Overview

We are a global advanced engineering and technology solutions provider to a broad base of U.S. and allied government agencies, supporting programs of critical national importance across energy and environmental, intelligence, space, defense, civilian and commercial end-markets. We offer a broad reach of capabilities including environment and climate sustainability, intelligence and counter threat solutions, data fusion and analytics, engineering and integration, advanced test, training and readiness, and citizen solutions. As a leading provider of differentiated technology solutions, we have built a repertoire of deep customer knowledge, enabling us to engage our customers across multiple capabilities and markets. Underpinned by a strong culture of ethics, safety and inclusivity, Amentum is committed to operational excellence and successful execution.

In fiscal year 2024, we completed our merger with Jacobs Solutions Inc. (“Jacobs”) Critical Mission Solutions business and portions of the Jacobs Divergent Solutions business (and, together with the Critical Mission Solutions business, referred to as the “CMS Business” or “CMS”), a leading provider of mission-critical, technology-driven services in government and commercial markets.

We conduct our business activities and report financial results as two business segments: Digital Solutions (“DS”) and Global Engineering Solutions (“GES”). Digital Solutions provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial

clients. Global Engineering Solutions provides large-scale environmental remediation, clean energy, platform engineering, sustainment and supply chain management across all 7 continents for the U.S. government and allied nations.

Budgetary Environment

In fiscal year 2024, we generated approximately 90% of our revenues from contracts with the U.S. federal government, either as a prime contractor or a subcontractor to other contractors engaged in work for the U.S. federal government. We carefully follow the U.S. federal budget, legislative and contracting trends and activities and evolve our strategies accordingly.

The U.S. federal government fiscal year (“GFY”) 2024 appropriations bill was passed in March 2024. The final bill was consistent with the Fiscal Responsibility Act of June 2023. Defense discretionary spending saw a 3.3% increase to $886 billion, while non-defense discretionary spending remained flat at $703 billion.

The GFY 2025 budget request was submitted to Congress in March 2024 and maintained the levels set in the Fiscal Responsibility Act. The budget request would increase defense discretionary spending from $886 billion to $895 billion and non-defense discretionary spending from $704 billion to $711 billion. The existing continuing resolution is set to expire on March 14, 2025.

President Trump was inaugurated in January 2025 and the new administration’s GFY 2026 budget request is expected to be submitted to Congress in April 2025. Under the Trump administration, the new Department of Government Efficiency was created to propose savings through improvements to technology and increases to productivity in the federal workforce; we continue to monitor the actions of the new administration which could result in a change to budgetary priorities or impact federal government procurement timing. Decreases in, or delays in approving, the federal government’s budget, decreases in government spending on the types of programs that we support, delays in government contract awards, and pauses on government contracts on which we are currently performing could have an adverse impact on our business. For further information, please see Item 1A., “Risk Factors,” in our Annual Report on Form 10-K for the fiscal year ended September 27, 2024.

While we view the budget environment as constructive and believe core funding sources for our primary customer-based markets will continue to experience bipartisan tailwinds, there can be no certainty about the level of funding for any particular GFY or that appropriations bills will be passed in a timely manner. During those periods of time when appropriations bills have not been passed and signed into law, government agencies operate under a continuing resolution (“CR”), a temporary measure allowing the government to continue operations at prior year funding levels. Depending on their scope, duration, and other factors, CRs can negatively impact our business due to delays in new program starts, delays in contract awards decisions, and other factors.

Market Environment

We believe our scale, breadth of capabilities, and depth of experience give us a robust understanding of our customers’ evolving needs. Given our portfolio diversity, we believe our total addressable market, and associated growth rate, is sufficient to support our strategic growth plans.

We believe Amentum’s capabilities are strategically aligned to well-funded, long-term priorities for the federal government, allied nations, and commercial customers. Specifically, we believe we are well positioned to continue to win new business driven by the following trends in our addressable market:

•Increasing demand for outsourced services and solutions with federal government customers;

•Increased global demand for clean and environmentally sustainable solutions;

•Increased spending on government-wide modernization priorities;

•Increasing government focus on near-peer competitors and other nation state threats;

•Increasing discretionary spending for Indo-Pacific regional activities and initiatives; and

•Increased investment in advanced technologies (e.g., hypersonics, microelectronics, unmanned, electromagnetic spectrum).

Results of Operations for the Three Months Ended December 27, 2024 and December 29, 2023

The following table presents our results of operations for the periods presented:


	December 27, 2024		December 29, 2023		Change
(Dollars in millions)	Dollars		Dollars		Dollars		Percent
Revenues	$	3,416	$	1,983	$	1,433	72.3	%
Cost of revenues	(3,055)		(1,789)		(1,266)		70.8
Selling, general, and administrative expenses	(130)		(67)		(63)		94.0
Amortization of intangibles	(120)		(56)		(64)		114.3
Equity earnings of non-consolidated subsidiaries	21		15		6		40.0

Operating income	132		86		46		53.5
Interest expense and other, net	(87)		(111)		24		(21.6)


Income (loss) before income taxes	45		(25)		70		(280.0)
Provision for income taxes	(24)		(14)		(10)		71.4
Net income (loss)	21		(39)		60		(153.8)
Less: net income attributable to non-controlling interests	(9)		(2)		(7)		350.0
Net income (loss) attributable to common shareholders	$	12	$	(41)	$	53	(129.3)

Revenues — The increase in revenues was primarily attributable to revenues from the merger with CMS.

Cost of revenues — The increase in cost of revenues was primarily attributable to the increased revenues volume from the merger with CMS. As a percentage of revenues, cost of revenues was 89.4% for the three months ended December 27, 2024 compared to 90.2% for the three months ended December 29, 2023, respectively.

Selling, general, and administrative expenses (“SG&A”) — The increase in SG&A was primarily attributable to the merger with CMS. SG&A as a percentage of revenues increased to 3.8% for the three months ended December 27, 2024 from 3.4% for the three months ended December 29, 2023 primarily due to the merger with CMS.

Amortization of intangibles — Amortization of intangibles primarily relates to the amortization of our backlog and customer relationship intangible assets, which increased due to the merger with CMS.

Equity earnings of non-consolidated subsidiaries — Equity earnings of non-consolidated subsidiaries include our proportionate share of the income from equity method investments and increased due to non-consolidated subsidiaries obtained in the merger with CMS.

Interest expense and other, net — The decrease in interest expense and other, net was primarily due to the reduction to our term loan principal balance as compared to the three months ended December 29, 2023 combined with a decrease in interest rates, partially offset by the interest incurred on our Senior Notes during the three months ended December 27, 2024.

Provision for income taxes — The effective tax rate for the three months ended December 27, 2024 was 53.3%, as compared to (56.0)% for the three months ended December 29, 2023. The change in the effective tax rate was primarily due to the recognition of a valuation allowance against a disallowed interest expense deferred tax asset relative to income (loss) before income taxes in the respective period.

Net income (loss) attributable to non-controlling interests — Net income (loss) attributable to non-controlling interests include the minority interests in our consolidated joint ventures that are not wholly-owned, which increased due to the merger with CMS.

Segment Results for the Three Months Ended December 27, 2024 and December 29, 2023

The primary financial performance measures we use to manage our reportable segments and monitor results of operations are revenues and Adjusted EBITDA.

The following tables present our performance measures by reportable segment:

Digital Solutions


	Three Months Ended
(Dollars in millions)	December 27, 2024		December 29, 2023		Dollar change		Percent change
Revenues	$	1,286	$	459	$	827	180	%
Adjusted EBITDA	100		38		62		163	%

The increase in revenues for the three months ended December 27, 2024, as compared to the three months ended December 29, 2023, was primarily attributable to revenues from the merger with CMS and the ramp up of new contract awards.

The increase in Adjusted EBITDA for the three months ended December 27, 2024, as compared to the three months ended December 29, 2023, was primarily attributable to contributions from the merger with CMS and the revenue growth factors described above.

Global Engineering Solutions


	Three Months Ended
(Dollars in millions)	December 27, 2024		December 29, 2023		Dollar change		Percent change
Revenues	$	2,130	$	1,524	$	606	40	%
Adjusted EBITDA	162		116		46		40	%

Revenues by Contract Type

Our earnings and profitability may vary materially depending on changes in the proportionate amount of revenues derived from each type of contract. For a discussion of the types of contracts under which we generate revenues, see “Critical Accounting Policies” below. The following table summarizes revenues by contract type, as a percentage of revenues, for the periods presented:


	Three Months Ended
	December 27, 2024		December 29, 2023
Cost-plus-fee	64	%	63	%
Fixed-price	24	%	26	%
Time-and-materials	12	%	11	%
Total revenues	100	%	100	%

Backlog

The Company's backlog represents the estimated amount of future revenues to be recognized under negotiated contracts. The Company’s backlog includes unexercised option years and excludes the value of task orders that may be awarded under multiple award indefinite delivery / indefinite quantity (“IDIQ”) vehicles until such task orders are issued.

The Company’s backlog is either funded or unfunded:

•Funded backlog represents contract value for which funding is appropriated less revenues previously recognized on the contract.

•Unfunded backlog represents estimated values that have the potential to be recognized as revenues from negotiated contracts for which funding has not been appropriated and from unexercised contract options.

As of December 27, 2024, the Company had total backlog of $45.2 billion, compared with $27.3 billion as of December 29, 2023, an increase of $17.9 billion primarily due to the merger with CMS. Funded backlog as of December 27, 2024 was $6.6 billion.

There is no assurance that all backlog will result in future revenues being recognized, and the backlog balance is subject to increases or decreases based on the execution of new contracts, contract modifications or extensions, deobligations, early terminations, and other factors.

Effects of Inflation

Given the nature of our operations and contract type mix, we expect the impact of inflation on our business may be limited for some of our contracts. During the three months ended December 27, 2024, 64% of our revenues was generated under cost-plus-fee type contracts that have limited inflation risk as they include provisions that adjust revenues to cover costs affected by inflation. The remainder of our revenues was generated under time-and-materials or fixed-price type contracts which we have historically been able to price in a manner that accommodates inflation and cost increases over the period of performance but changes in our expectations with respect to inflation rates or in the overall mix of our contract types could cause future results to differ substantially.

Liquidity and Capital Resources

Existing cash and cash equivalents and cash generated by operations are our primary sources of liquidity, as well as sales of receivables under our Master Accounts Receivable Purchase Agreement (“MARPA”) and available borrowing capacity under the revolving credit facility provided for in the senior secured credit facility (the “Credit Facility”).

The Credit Facility consists of a seven year, $3,750 million term facility (“Term Loan”) and a five year, $850 million revolving facility (“Revolver”), including a $200 million letter of credit subfacility and a $100.0 million swingline subfacility. The Revolver and the Term Loan mature on September 27, 2029 and September 27, 2031, respectively. The Term Loan requires quarterly principal amortization payments of $9 million commencing March 31, 2025 with the remainder of the principal thereunder being due at maturity. In August 2024, the Company also completed an offering of $1,000 million in aggregate principal amount of 7.250% senior notes due August 01, 2032 (the “Senior Notes”).

The New Credit Facility and the Senior Notes are guaranteed by substantially all of our wholly owned material domestic restricted subsidiaries, subject to customary exceptions set forth in the credit agreement and indenture, respectively.

We believe that the combination of internally generated funds, available bank borrowings, and cash and cash equivalents on hand will provide the required liquidity and capital resources necessary to fund on-going operations, capital expenditures, scheduled principal and interest payments on our debt obligations, scheduled lease payments, and other working capital requirements over at least the next twelve months.

Over the longer term, our ability to generate sufficient cash flows from operations necessary to fulfill the obligations under the Credit Facility, Senior Notes and any other indebtedness we may incur will depend on our future financial performance which could be affected by factors outside of our control, including worldwide economic and financial market conditions.

See “Note 6 — Sales of Receivables” and “Note 9 — Debt” of the notes to the condensed consolidated financial statements contained within this Quarterly Report on Form 10-Q.

Cash Flow Information


	Three Months Ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Net cash provided by (used in) operating activities	$	110	$	(83)
Net cash used in investing activities	(8)		(3)
Net cash used in financing activities	(16)		(14)
Effect of exchange rate changes on cash and cash equivalents	(16)		6
Net increase (decrease) in cash and cash equivalents	$	70	$	(94)

Net cash provided by operating activities increased by $193 million for the three months ended December 27, 2024 when compared to the three months ended December 29, 2023 as a result of a $110 million increase in cash earnings due to contributions from the merger with CMS and from $83 million in favorable changes in operating assets and liabilities driven by the timing of interest payments.

Net cash used in investing activities increased by $5 million for the three months ended December 27, 2024 when compared to the three months ended December 29, 2023 as a result of increased capital expenditures due to the merger with CMS.

Net cash used in financing activities increased by $2 million for the three months ended December 27, 2024 when compared to the three months ended December 29, 2023 primarily as a result of distributions to non-controlling interests and the absence of quarterly principal amortization payments on our Term Loan, which commence in March 2025.

Critical Accounting Policies and Estimates

There have been no significant changes to the Company’s critical accounting policies as disclosed in our Annual Report on Form 10-K for the year ended September 27, 2024.

Recent Accounting Pronouncements

See “Note 2 — Recent Accounting Pronouncements” of the notes to the condensed consolidated financial statements contained within this Quarterly Report on Form 10-Q.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

The remaining balance under the Term Loan, and any additional amounts that may be borrowed under the Revolver, are currently subject to interest rate fluctuations. We have the ability to manage these fluctuations in part through interest rate swaps on our variable rate debt. We have entered into floating-to-fixed interest rate swap agreements for an aggregate notional amount of $1.9 billion related to a portion of our variable rate debt. With every one percent fluctuation in the applicable interest rates, interest expense on our variable rate debt for the three months ended December 27, 2024 would have fluctuated by approximately $9 million.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including the Chief Executive Officer and the Chief Financial Officer, we conducted an evaluation of the effectiveness of our disclosure controls and procedures (as such term is defined in Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) as of the end of the period covered by this report. Based on this evaluation, our Chief Executive Officer and our Chief Financial Officer concluded that our disclosure controls and procedures were effective as of such date.

Changes in Internal Control Over Financial Reporting

Other than changes related to the merger with the CMS Business, there have been no changes in our internal control over financial reporting (as such term is defined in rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fiscal quarter ended December 27, 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

The information required with respect to this item is set forth in Note 14 — Legal Proceedings and Commitments and Contingencies in the Notes to Consolidated Financial Statements appearing under Part I, Item 1 of this Form 10-Q.

Item 1A. Risk Factors

There have been no material changes to our Risk Factors disclosed in the Company’s Form 10-K for the year end September 27, 2024.

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

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

Item 6. Exhibits

Filed
with this Form 10-Q

Incorporated by Reference

Exhibit No.

Description

Form

Filing Date

Exhibit No.

4.1

Third Supplemental Indenture, dated as of December 10, 2024, between Amazon Holdco Inc. and U.S. Bank Trust Company, National Association, as trustee.

31.1

Section 302 Certification of John E. Heller

31.2

Section 302 Certification Travis B. Johnson

32.1

Section 906 Certification John E. Heller

32.2

Section 906 Certification Travis B. Johnson

101.INS

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 Document

101.CAL

Inline XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF

Inline XBRL Taxonomy Extension Definition Linkbase Document

101.LAB

Inline XBRL Taxonomy Extension Label Linkbase Document

101.PRE

Inline XBRL Taxonomy Extension Presentation Linkbase Document

104

Cover Page Interactive Data File (embedded within the Inline XBRL document and contained in Exhibit 101)

Denotes a management contract, compensatory plan, or arrangement

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.

AMENTUM HOLDINGS, INC.

Registrant

Date:

February 5, 2025

By:

/s/ Travis B. Johnson

Travis B. Johnson

Chief Financial Officer

(Principal Financial Officer and Principal Accounting Officer)

Exhibit 4.1

EXECUTION VERSION

THIRD SUPPLEMENTAL INDENTURE

Third Supplemental Indenture (this “Supplemental Indenture”), dated as of December 10, 2024, by the entities set forth on Schedule I hereto (the “Guarantors”) and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”).

W I T N E S E T H

WHEREAS, Amentum Escrow Corporation (the “Issuer”) and U.S. Bank Trust Company, National Association (the “Trustee”) have heretofore executed and delivered an indenture, dated as of August 13, 2024 (as amended, supplemented, waived or otherwise modified, the “Indenture”), providing for the issuance of 7.250% Senior Notes due 2032 (the “Notes”);

WHEREAS, the Indenture provides that under certain circumstances the Guarantors shall execute and deliver to the Trustee a supplemental indenture pursuant to which the Guarantors shall unconditionally guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and conditions set forth herein and under the Indenture (the “Note Guarantee”); and

WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture to amend or supplement the Indenture without the consent of any Holder.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders as follows:

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned such terms in the Indenture.

(2) Guarantee. Each Guarantor hereby agrees to provide an unconditional Note Guarantee on the terms and subject to the conditions set forth in the Indenture, including but not limited to Article 10 thereof.

(3) Execution and Delivery. Each Guarantor hereby agrees that its Note Guarantee shall remain in full force and effect notwithstanding the absence of the endorsement of any notation of such Note Guarantee on the Notes.

(4) Governing Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

(5) Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Supplemental Indenture and of signature pages by facsimile, PDF or other electronic transmission shall constitute effective execution and delivery of this Supplemental Indenture as to the parties hereto and may be used in lieu of the original Supplemental Indenture for all purposes.

Signatures of the parties hereto transmitted by facsimile, PDF or other electronic transmission (including any electronic signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law) shall be deemed to be their original signatures for all purposes.

(6) Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

(7) Ratification Of Indenture; Supplemental Indentures Part of Indenture. Except as expressly amended hereby, the Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder heretofore or hereafter authenticated and delivered shall be bound hereby.

(8) The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity, sufficiency or adequacy of this Supplemental Indenture or for or in respect of the statements or recitals contained herein, all of which recitals are made solely by the Guarantors.

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all as of the date first above written.

AMAZON FINANCE LLC

CH2M HILL NEW YORK INC.

ENERGY, SECURITY AND TECHNOLOGY LLC

By: /s/ Mark Esposito

Name: Mark Esposito

Title: Vice President & Assistant Secretary

[Signature Page to Third Supplemental Indenture]

U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION, as Trustee

By: /s/ Joshua A. Hahn

Name: Joshua A. Hahn
Title: Vice President

[Signature Page to Third Supplemental Indenture]

SCHEDULE I

Subsidiary Guarantors


	Entity	Jurisdiction
1.	Amazon Finance LLC	Delaware
1.	CH2M Hill New York Inc.	New York
1.	Energy, Security and Technology LLC	Delaware

Exhibit 31.1

Section 302 Certification

I, John. E. Heller, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q, of Amentum Holdings, Inc.;

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 registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer 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)) for the registrant 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 registrant, 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) Evaluated the effectiveness of the registrant’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

(c) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’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 registrant’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 registrant’s internal control over financial reporting.


Date:	February 5, 2025
		/s/ John E. Heller
		John E. Heller
		Chief Executive Officer and Director
		(Principal Executive Officer)

Exhibit 31.2

Section 302 Certification

I, Travis B. Johnson, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q, of Amentum Holdings, Inc.;

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


Date:	February 5, 2025
		/s/ Travis B. Johnson
		Travis B. Johnson
		Chief Financial Officer
		(Principal Financial Officer and Principal Accounting Officer)

Exhibit 32.1

Section 906 Certification

In connection with the Quarterly Report on Form 10-Q of Amentum Holdings, Inc. (the “Company”) for the three months ended December 27, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned Chief Executive Officer and Director of the Company certifies, to the best of his knowledge and belief pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, 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:	February 5, 2025
		/s/ John E. Heller
		John E. Heller
		Chief Executive Officer and Director
		(Principal Executive Officer)

Exhibit 32.2

Section 906 Certification

In connection with the Quarterly Report on Form 10-Q of Amentum Holdings, Inc. (the “Company”) for the three months ended December 27, 2024, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned Chief Financial Officer of the Company certifies, to the best of his knowledge and belief pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d), as applicable, 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:	February 5, 2025
		/s/ Travis B. Johnson
		Travis B. Johnson
		Chief Financial Officer
		(Principal Financial Officer and Principal Accounting Officer)

Cover - shares	3 Months Ended
Cover - shares	Dec. 27, 2024	Jan. 31, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 27, 2024
Document Transition Report	false
Entity File Number	001-42176
Registrant Name	Amentum Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	99-0622272
Entity Address, Address Line One	4800 Westfields Blvd., Suite #400
Entity Address, City or Town	Chantilly
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20151
City Area Code	703
Local Phone Number	579-0410
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	AMTM
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		243,302,426
Central Index Key	0002011286
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--10-03

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 27, 2024	Sep. 27, 2024
Current assets:
Cash and cash equivalents	$ 522	$ 452
Accounts receivable, net	2,405	2,401
Prepaid expenses and other current assets	213	231
Total current assets	3,140	3,084
Property and equipment, net	140	144
Equity method investments	124	123
Goodwill	5,588	5,556
Intangible assets, net	2,503	2,623
Other long-term assets	424	444
Total assets	11,919	11,974
Current liabilities:
Current portion of long-term debt	44	36
Accounts payable	726	764
Accrued compensation and benefits	691	696
Contract liabilities	143	113
Other current liabilities	367	356
Total current liabilities	1,971	1,965
Long-term debt, net of current portion	4,636	4,643
Deferred tax liabilities	347	370
Other long-term liabilities	402	444
Total liabilities	7,356	7,422
Commitments and contingencies (Note 14)
SHAREHOLDERS' EQUITY
Common stock, $0.01 par value, 1,000,000,000 shares authorized; 243,302,257 shares issued and outstanding at December 27, 2024 and 243,302,173 shares issued and outstanding at September 27, 2024.	2	2
Additional paid-in capital	4,965	4,962
Retained deficit	(515)	(527)
Accumulated other comprehensive income	23	23
Total Amentum shareholders' equity	4,475	4,460
Non-controlling interests	88	92
Total shareholders' equity	4,563	4,552
Total liabilities and shareholders' equity	$ 11,919	$ 11,974
Common stock, issued (shares)	243,302,257	243,302,173
Common stock, outstanding (shares)	243,302,257	243,302,173

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 27, 2024	Sep. 27, 2024
Statement of Financial Position [Abstract]
Common stock, par value (in Dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, issued (shares)	243,302,257	243,302,173
Common stock, outstanding (shares)	243,302,257	243,302,173

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Income Statement [Abstract]
Revenues	$ 3,416	$ 1,983
Cost of revenues	(3,055)	(1,789)
Selling, general, and administrative expenses	(130)	(67)
Amortization of intangibles	(120)	(56)
Equity earnings of non-consolidated subsidiaries	21	15
Operating income	132	86
Interest expense and other, net	(87)	(111)
Income (loss) before income taxes	45	(25)
Provision for income taxes	(24)	(14)
Net income (loss)	21	(39)
Less: net income attributable to non-controlling interests	(9)	(2)
Net income (loss) attributable to common shareholders	$ 12	$ (41)
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.05	$ (0.46)
Diluted (in dollars per share)	$ 0.05	$ (0.46)

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 21	$ (39)
Other comprehensive income (loss):
Net unrealized gain (loss) on interest rate swaps	22	(29)
Foreign currency translation adjustments	(18)	6
Other comprehensive income (loss)	4	(23)
Income tax (provision) benefit related to items of other comprehensive income (loss)	(4)	4
Other comprehensive loss, net of tax	0	(19)
Comprehensive income (loss)	21	(58)
Non-controlling interests	(9)	(2)
Comprehensive income (loss) attributable to common shareholders	$ 12	$ (60)

CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total	Total Shareholders' Equity Attributable to Amentum Holdings, Inc.	Common Stock	Additional Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance at Sep. 29, 2023	$ 416	$ 375		$ 772	$ (445)	$ 48	$ 41
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(39)	(41)			(41)		2
Other comprehensive loss, net of tax	(19)	(19)				(19)
Equity based compensation and other	0	3		3			(3)
Ending balance at Dec. 29, 2023	$ 358	318		775	(486)	29	40
Beginning balance (shares) at Sep. 27, 2024	243,302,173		243,000,000
Beginning balance at Sep. 27, 2024	$ 4,552	4,460	$ 2	4,962	(527)	23	92
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	21	12			12		9
Other comprehensive loss, net of tax	0
Distributions to non-controlling interests	(13)						(13)
Equity based compensation and other	$ 3	3		3
Ending balance (shares) at Dec. 27, 2024	243,302,257		243,000,000
Ending balance at Dec. 27, 2024	$ 4,563	$ 4,475	$ 2	$ 4,965	$ (515)	$ 23	$ 88

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Cash flows from operating activities
Net income (loss)	$ 21	$ (39)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation	9	7
Amortization of intangibles	120	56
Amortization of deferred loan costs and original issue discount	3	5
Derivative instruments	3	15
Equity earnings of non-consolidated subsidiaries	(21)	(15)
Distributions from equity method investments	21	17
Deferred income taxes	(15)	(12)
Equity-based compensation	3	1
Other	(1)	(2)
Changes in assets and liabilities, net of effects of business acquisition:
Accounts receivable, net	(27)	(103)
Prepaid expenses and other assets	35	8
Accounts payable, contract liabilities, and other current liabilities	(31)	(27)
Accrued employee compensation and benefits	(6)	8
Other long-term liabilities	(4)	(2)
Net cash provided by (used in) operating activities	110	(83)
Cash flows from investing activities
Payments for property and equipment	(8)	(2)
Contributions to equity method investments	(1)	0
Other	1	(1)
Net cash used in investing activities	(8)	(3)
Cash flows from financing activities
Borrowings on revolving credit facilities	210	200
Payments on revolving credit facilities	(210)	(200)
Repayments of borrowings under the credit agreement	0	(8)
Repayments of borrowings under other agreements	(2)	(3)
Distributions to non-controlling interests	(13)	(1)
Other	(1)	(2)
Net cash used in financing activities	(16)	(14)
Effect of exchange rate changes on cash	(16)	6
Net change in cash and cash equivalents	70	(94)
Cash and cash equivalents, beginning of period	452	305
Cash and cash equivalents, end of period	522	211
Supplemental disclosure of cash flow information
Income (taxes paid) tax refunds received, net of receipts	(6)	2
Interest paid	$ (39)	$ (94)

Basis of Presentation	3 Months Ended
Basis of Presentation	Dec. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation Amentum Holdings, Inc. (collectively with its subsidiaries, “we,” “us,” “our,” “Amentum,” or the “Company”) is a global advanced engineering and technology solutions provider to a broad base of U.S. and allied government agencies, supporting programs of critical national importance across energy and environmental, intelligence, space, defense, civilian and commercial end-markets. We offer a broad reach of capabilities including intelligence and counter threat solutions, data fusion and analytics, engineering and integration, environmental solutions, advanced test, training and readiness, and citizen solutions. As a leading provider of differentiated technology solutions, we have built a repertoire of deep customer knowledge, enabling us to engage our customers across multiple capabilities and markets. During the three months ended December 27, 2024, we announced the realignment of our reporting structure, which resulted in the identification of two reportable segments: Digital Solutions (“DS”) and Global Engineering Solutions (“GES”). The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients. The Global Engineering Solutions segment provides large-scale environmental remediation, clean energy, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations. As a result of this change, prior year segment disclosures have been recast to reflect the current reportable segment structure. On September 27, 2024, the spin-off of the Jacobs Solutions Inc. (“Jacobs”) Critical Mission Solutions business and portions of the Jacobs Divergent Solutions business (and, together with the Critical Mission Solutions business, referred to as the “CMS Business” or “CMS”) merged with Amentum Parent Holdings LLC (collectively, the “Transaction”) with the surviving entity renamed Amentum Holdings, Inc. Amentum Parent Holdings LLC is considered the Company’s predecessor, and the historical financial statements of Amentum Parent Holdings LLC prior to September 27, 2024 are reflected in this Quarterly Report on Form 10-Q as the Company’s historical financial statements. Accordingly, the financial results of the Company prior to September 27, 2024 do not include the financial results of CMS, and current and future results will not be comparable to historical results. The accompanying unaudited condensed consolidated financial statements of the Company include the assets, liabilities, results of operations, comprehensive income (loss) and cash flows for the Company, including its wholly-owned subsidiaries and joint ventures that are majority-owned or otherwise controlled by the Company. Certain information and note disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted, although the Company believes that the disclosures made are adequate to make the information presented not misleading. All intercompany transactions and balances have been eliminated in consolidation. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments and reclassifications (all of which are of a normal, recurring nature) that are necessary for the fair presentation of the periods presented. It is suggested that these unaudited condensed consolidated financial statements be read in conjunction with the audited consolidated financial statements and the notes thereto included in the Company’s latest annual report for the fiscal year ended September 27, 2024. The results of operations for the three months ended December 27, 2024 are not necessarily indicative of the results to be expected for any subsequent interim period or for the full fiscal year.

Recent Accounting Pronouncements	3 Months Ended
Recent Accounting Pronouncements	Dec. 27, 2024
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Accounting Standards Updates Issued but Not Yet Adopted In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements. This update requires disclosure of significant segment expenses and other segment items in annual and interim periods. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The amendment requires retrospective application to all prior periods presented in the financial statements and early adoption is permitted. We are currently evaluating the impacts of the new standard on our consolidated financial statements. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance transparency and usefulness of income tax disclosures. This update requires disaggregated information about an entity’s effective tax rate reconciliation as well as information on income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024, and may be applied on a prospective or retrospective basis. Early adoption is permitted. We are currently evaluating the impacts of the new standard on our consolidated financial statements.

Acquisitions	3 Months Ended
Acquisitions	Dec. 27, 2024
Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract]
Acquisitions	Acquisition On September 27, 2024, the Company completed its merger with CMS, a leading provider of mission-critical, technology-driven services in government and commercial markets, in a Reverse Morris Trust transaction. Immediately following the Transaction, the Company had approximately 243 million issued and outstanding shares of common stock, of which Jacobs and its shareholders owned 58.5% of the issued and outstanding shares of common stock, and Amentum Joint Venture LP, our previous parent company (“AJVLP” and “Amentum Equityholder”) owned 37.0%. Subsequently, Amentum Equityholder distributed its shares of our common stock to certain parties (collectively, “Sponsor Stockholder”). Further, 4.5% of the issued and outstanding shares of common stock have been placed in escrow, to be released and delivered in the future to Jacobs and its shareholders or to Sponsor Stockholder, depending on the achievement of certain fiscal year 2024 targets by the CMS Business (“Additional Merger Consideration”). The final determination of this Additional Merger Consideration is expected to be completed during the measurement period. The Transaction was accounted for as a business combination. The Company assessed the fair value of the identifiable intangible assets including customer relationships and backlog, which were valued using the excess earnings method of the income approach. This method requires several judgments and assumptions to determine the fair value of the intangible assets including expected future cash flows, weighted-average cost of capital, discount rates, useful lives of assets and expected long-term growth rates. The goodwill recognized was attributable to the synergies expected to be achieved by combining the businesses of Amentum and CMS, expected future contracts and the acquired workforce. The goodwill is partially deductible for tax purposes. The purchase price was allocated, on a preliminary basis, to the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values as of the acquisition date, with the excess purchase consideration recorded as goodwill. The Company is still evaluating the determination of fair values allocated to various assets and liabilities, including, but not limited to, intangible assets, accounts receivable, other current assets, property and equipment, equity method investments and joint ventures, other long-term assets, income taxes, deferred taxes, accounts payables, other current liabilities, contract liabilities, other long-term liabilities, non-controlling interests, additional merger consideration and goodwill. The allocation of the purchase price is preliminary and subject to change as the Company continues to obtain and assess relevant information that existed as of the acquisition date, including but not limited to, information pertaining to CMS’ legal proceedings, reserves, income taxes, contracts with customers, and pre-acquisition contingencies. Additionally, in connection and in accordance with the terms of the spin-off, prior to the spin-off and Transaction, CMS provided a cash payment to Jacobs of approximately $911 million, after adjustments based on the levels of cash, debt and working capital in the CMS Business, which is subject to final settlement between the parties, as set forth in the Merger Agreement, and may result in changes to the purchase price allocation. The Company expects to have sufficient information available to resolve these items within one year of the CMS acquisition date. During the three months ended December 27, 2024, the Company made fair value adjustments which increased goodwill and other current liabilities by $32 million and $20 million, respectively, and decreased accounts receivable and deferred tax liabilities by $22 million and $10 million, respectively. The estimated fair value of acquired backlog of $270 million is amortized on an accelerated basis over approximately 1 year and the estimated fair value of customer relationship intangible assets of $1,590 million is amortized on an accelerated basis over approximately 14 years. The fair value attributed to these intangible assets acquired was based on assumptions and other information compiled by management, including independent valuations that utilized established valuation techniques, and thus represents a Level 3 fair value measurement. The income approach was primarily used to value the intangible assets, consisting primarily of acquired program and contract intangibles and backlog. The income approach indicates value for an asset based on the present value of cash flow projected to be generated by the asset. Projected cash flow is discounted at a rate of return that reflects the relative risk of achieving the cash flow and the time value of money.

Revenues

3 Months Ended

Dec. 27, 2024

Revenue from Contract with Customer [Abstract]

Revenues

Disaggregation of Revenues

Disaggregated revenues by customer-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Department of Defense and U.S. Intelligence Community	$	722	$	1,046	$	1,768	$	351	$	952	$	1,303
Other U.S. Government Agencies	416		600		1016		87		373		460
Commercial and International	148		484		632		21		199		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by contract-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Cost-plus-fee	$	785	$	1,381	$	2,166	$	219	$	1,035	$	1,254
Fixed-price	359		472		831		155		354		509
Time-and-materials	142		277		419		85		135		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by prime contractor versus subcontractor were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Prime contractor	$	1,164	$	1,878	$	3,042	$	409	$	1,351	$	1,760
Subcontractor	122		252		374		50		173		223
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Revenues by geographic location are reported by the country in which the work is performed and were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
United States	$	1,222	$	1,263	$	2,485	$	384	$	1,063	$	1,447
International	64		867		931		75		461		536
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Changes in Estimates on Contracts

Changes in estimated contract earnings at completion using the cumulative catch-up method of accounting were recognized in revenues as follows:


	Three Months Ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Favorable earnings at completion adjustments	$	32	$	24
Unfavorable earnings at completion adjustments	(24)		(17)
Net favorable adjustments	$	8	$	7

Impact on diluted earnings per share attributable to common shareholders (1)	$	0.02	$	0.07

(1) The impact on diluted loss per share attributable to common shareholders is calculated using our statutory rate.

Remaining Performance Obligations

Contract Balances

The Company's contract balances consisted of the following (in millions):


		As of
Description of Contract Related Balance	Classification	December 27, 2024		September 27, 2024
Billed and billable receivables	Accounts receivable, net	$	1,443	$	1,378
Contract assets	Accounts receivable, net	927		986
Related party receivables	Accounts receivable, net	35		37
Long-term contract assets	Other long-term assets	138		138
Contract liabilities - deferred revenues and other contract liabilities	Contract liabilities	(143)		(113)

The Company has related party receivables due from our equity method investments, discussed further in Note 10 — Joint Ventures.

Contract Balances

3 Months Ended

Dec. 27, 2024

Revenue from Contract with Customer [Abstract]

Contract Balances

Revenues

Disaggregation of Revenues

Disaggregated revenues by customer-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Department of Defense and U.S. Intelligence Community	$	722	$	1,046	$	1,768	$	351	$	952	$	1,303
Other U.S. Government Agencies	416		600		1016		87		373		460
Commercial and International	148		484		632		21		199		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by contract-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Cost-plus-fee	$	785	$	1,381	$	2,166	$	219	$	1,035	$	1,254
Fixed-price	359		472		831		155		354		509
Time-and-materials	142		277		419		85		135		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by prime contractor versus subcontractor were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Prime contractor	$	1,164	$	1,878	$	3,042	$	409	$	1,351	$	1,760
Subcontractor	122		252		374		50		173		223
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Revenues by geographic location are reported by the country in which the work is performed and were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
United States	$	1,222	$	1,263	$	2,485	$	384	$	1,063	$	1,447
International	64		867		931		75		461		536
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Changes in Estimates on Contracts

Changes in estimated contract earnings at completion using the cumulative catch-up method of accounting were recognized in revenues as follows:


	Three Months Ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Favorable earnings at completion adjustments	$	32	$	24
Unfavorable earnings at completion adjustments	(24)		(17)
Net favorable adjustments	$	8	$	7

Impact on diluted earnings per share attributable to common shareholders (1)	$	0.02	$	0.07

(1) The impact on diluted loss per share attributable to common shareholders is calculated using our statutory rate.

Remaining Performance Obligations

Contract Balances

The Company's contract balances consisted of the following (in millions):


		As of
Description of Contract Related Balance	Classification	December 27, 2024		September 27, 2024
Billed and billable receivables	Accounts receivable, net	$	1,443	$	1,378
Contract assets	Accounts receivable, net	927		986
Related party receivables	Accounts receivable, net	35		37
Long-term contract assets	Other long-term assets	138		138
Contract liabilities - deferred revenues and other contract liabilities	Contract liabilities	(143)		(113)

The Company has related party receivables due from our equity method investments, discussed further in Note 10 — Joint Ventures.

Sales of Receivables

3 Months Ended

Dec. 27, 2024

Transfers and Servicing of Financial Assets [Abstract]

Sales of Receivables

The Company's MARPA activity consisted of the following (in millions):


	As of and for the Three Months Ended December 27, 2024

Beginning balance:	$	177
Sales of receivables	952
Cash collections	(945)
Outstanding balance sold to Purchaser (1)	184
Cash collected, not remitted to Purchaser (2)	(18)
Remaining sold receivables	$	166

(2) Includes the cash collected on behalf of but not yet remitted to the Purchaser as of December 27, 2024. This balance is included in Other accrued liabilities as of the balance sheet date.

Goodwill and Intangible Assets

3 Months Ended

Dec. 27, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill

The table below presents changes in the carrying amount of goodwill for the periods presented:


(Amounts in millions)	Total
Balance as of September 27, 2024	$	5,556
Acquisition of CMS (1)	32
Balance as of December 27, 2024	$	5,588

(1) Represents changes to goodwill resulting from measurement period adjustments recorded in fiscal year 2025 associated with the acquisition of CMS purchase price allocation.

Intangible Assets

Intangible assets, net consisted of the following:


	December 27, 2024						September 27, 2024
(Amounts in millions)	Gross Carrying Value		Accumulated Amortization		Net		Gross Carrying Value		Accumulated Amortization		Net
Backlog	$	931	$	(628)	$	303	$	931	$	(552)	$	379
Customer relationship intangible assets	2,781		(594)		2,187		2,781		(550)		2,231
Capitalized software	23		(10)		13		23		(10)		13
Total intangible assets, net	$	3,735	$	(1,232)	$	2,503	$	3,735	$	(1,112)	$	2,623

Amortization expense was $120 million and $56 million for the three months ended December 27, 2024 and December 29, 2023, respectively.

Income Taxes	3 Months Ended
Income Taxes	Dec. 27, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate was 53.3% and (56.0)% for the three months ended December 27, 2024 and December 29, 2023, respectively. The most significant item contributing to the difference between the statutory U.S. federal corporate tax rate of 21.0% and the Company’s effective tax rate for the three months ended December 27, 2024 and December 29, 2023 was an increase in the valuation allowance against the deferred tax asset related to disallowed interest expense of $12 million and $23 million, respectively.

Debt

3 Months Ended

Dec. 27, 2024

Debt Disclosure [Abstract]

Debt

Debt consisted of the following:


	As of
(Amounts in millions)	December 27, 2024		September 27, 2024
Term Loan	$	3,750	$	3,750
Senior notes	1,000		1,000
Other	15		17
Total debt	4,765		4,767
Unamortized original issue discount and unamortized deferred financing costs	(85)		(88)
Total debt, net of original issue discount and deferred financing costs	4,680		4,679
Less current portion of long-term debt	(44)		(36)
Total long-term debt, net of current portion	$	4,636	$	4,643

Cash Flow Hedges

Joint Ventures

3 Months Ended

Dec. 27, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Joint Ventures

We account for joint ventures in accordance with ASC 810, Consolidation. The Company analyzes its joint ventures and classifies them as either:

The following table presents selected financial information for our consolidated joint ventures that are VIEs as of December 27, 2024 and September 27, 2024:


	As of
(Amounts in millions)	December 27, 2024		September 27, 2024
Cash and cash equivalents	$	143	$	160
Current assets	305		322
Non-current assets	3		2
Total assets	$	451	$	484

Current liabilities	$	160	$	190
Non-current liabilities	1		1
Total liabilities	161		191

Total Amentum equity	226		228
Non-controlling interests	64		65
Total equity	290		293
Total liabilities and equity	$	451	$	484

The following table presents selected financial information for our consolidated joint ventures that are VIEs for the three months ended December 27, 2024 and December 29, 2023:


	For the three months ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Revenues	$	376	$	69
Cost of revenues	(336)		(58)
Net income	39		10

Accumulated Other Comprehensive Income (Loss)

3 Months Ended

Dec. 27, 2024

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)


	Gain (Loss) on Derivative Instruments		Foreign Currency Translation Adjustments		Pension Related Adjustments		Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss)


(Amounts in millions)
Balance at September 27, 2024	$	(22)	$	3	$	55	$	(13)	$	23
Other comprehensive (loss) income before reclassification	25		(18)		—		(4)		3
Amounts reclassified from accumulated other comprehensive (loss) income	(3)		—		—		—		(3)
Balance at December 27, 2024	$	—	$	(15)	$	55	$	(17)	$	23


	Gain (Loss) on Derivative Instruments		Foreign Currency Translation Adjustments		Pension Related Adjustments		Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss)


(Amounts in millions)
Balance at September 29, 2023	$	25	$	(5)	$	46	$	(18)	$	48
Other comprehensive (loss) income before reclassification	(27)		6		—		4		(17)
Amounts reclassified from accumulated other comprehensive (loss) income	(2)		—		—		—		(2)
Balance at December 29, 2023	$	(4)	$	1	$	46	$	(14)	$	29

Segment Information

3 Months Ended

Dec. 27, 2024

Segment Reporting [Abstract]

Segment Information

The Company’s segment revenues were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

The following table reconciles segment Adjusted EBITDA to net income (loss) attributable to common shareholders:


	Three months ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Adjusted EBITDA by segment
DS	$	100	$	38
GES	162		116
Adjusted EBITDA attributable to Amentum Holdings, Inc.	262		154
Depreciation expense	(9)		(7)
Amortization of intangibles	(120)		(56)
Interest expense and other, net	(87)		(111)
Non-controlling interests	9		2
Acquisition, transaction and integration costs1	(9)		(7)
Utilization of fair market value adjustments2	2		1
Share-based compensation3	(3)		(1)
Income (loss) before income taxes	45		(25)
Provision for income taxes	(24)		(14)
Net income (loss)	21		(39)
Non-controlling interests	(9)		(2)
Net income (loss) attributable to common shareholders	$	12	$	(41)

(1) Represents acquisition, transaction and integration costs, including severance, retention, and other adjustments related to acquisition and integration activities.

(3) Represents non-cash compensation expenses recognized for share based arrangements.

Asset information by segment is not a key measure of performance used by the CODM.

Earnings (Loss) Per Share

3 Months Ended

Dec. 27, 2024

Earnings Per Share [Abstract]

Earnings (Loss) Per Share

Basic and diluted earnings (loss) per share are computed as follows (in millions, except per share data):


	For the three months ended
	December 27, 2024		December 29, 2023
Net income (loss) attributable to common shareholders	$	12	$	(41)
Weighted-average number of basic shares outstanding during the period	243		90

Weighted-average number of diluted shares outstanding during the period	243		90
Basic earnings (loss) per share	$	0.05	$	(0.46)
Diluted earnings (loss) per share	$	0.05	$	(0.46)

Legal Proceedings and Commitments and Contingencies	3 Months Ended
Legal Proceedings and Commitments and Contingencies	Dec. 27, 2024
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings and Commitments and Contingencies	Legal Proceedings and Commitments and Contingencies The Company is involved in various claims, disputes and administrative proceedings arising in the normal course of business. Liabilities for loss contingencies arising from claims, assessments, litigation, fines and penalties and other sources are recorded when it is probable that an unfavorable result and/or liability will be incurred and the cost of the unfavorable result or liability can be reasonably estimated. Management is of the opinion that any liability or loss associated with such matters, either individually or in the aggregate, will not have a material adverse effect on the Company’s operations and liquidity. Payments to the Company on cost-plus-fee contracts are provisional and are subject to adjustments upon audit by the Defense Contract Audit Agency (“DCAA”). In management’s opinion, audit adjustments that may result from audits not yet completed or started are not expected to have a material adverse effect on the Company’s operations and liquidity. Pending Litigation and Claims Department of Energy Claims In January 2020, the Company purchased assets and assumed liabilities associated with AECOM Energy & Construction, Inc. (the “Acquired Affiliate”) from AECOM (the “Seller”). At the time of the acquisition, the Acquired Affiliate had pending claims against the U.S. Department of Energy (“DOE”) related to a contract performed prior to the acquisition. The Company and the Seller agreed that all future claim recoveries and costs with the DOE would be split 10% to the Company and 90% to the Seller. Following the DOE’s denial of the claims, on December 20, 2020, the Acquired Affiliate filed an appeal of these decisions in the U.S. Court of Federal Claims. The Company has estimated and recorded $138 million within other long-term assets on the balance sheet and $125 million within other long-term liabilities on the balance sheet representing the Company’s payable to the Seller related to this matter. No changes to these amounts have been recorded since the acquisition. The Company intends to cooperate with the Seller in the pursuit of all claimed amounts but can provide no certainty that the Company will recover the claims. The Company does not believe any additional incurred claims or costs related to this matter will have a material adverse effect on the Company’s results of operations. U.S. Government Investigations We primarily sell our services to the U.S. Government. These contracts are subject to extensive legal and regulatory requirements, and we are occasionally the subject of investigations by various agencies of the U.S. Government who investigate whether our operations are being conducted in accordance with these requirements. Such investigations could result in administrative, civil or criminal liabilities, including repayments, fines or penalties being imposed on us, or could lead to suspension or debarment from future U.S. Government contracting. U.S. Government investigations often take years to complete and may result in adverse action against us. Any adverse actions arising from such matters could have a material effect on our ability to invoice and receive timely payment on our contracts, perform contracts or compete for contracts with the U.S. Government and could have a material effect on our operating performance. There are currently no investigations that are expected to have a material impact on our results of operations.

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Dec. 27, 2024	Dec. 29, 2023
Pay vs Performance Disclosure
Net income (loss) attributable to common shareholders	$ 12	$ (41)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 27, 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

Basis of Presentation (Policies)	3 Months Ended
Basis of Presentation (Policies)	Dec. 27, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Segments	During the three months ended December 27, 2024, we announced the realignment of our reporting structure, which resulted in the identification of two reportable segments: Digital Solutions (“DS”) and Global Engineering Solutions (“GES”). The Digital Solutions segment provides advanced digital and data-driven solutions including intelligence analytics, space system development, cybersecurity, and next generation IT across the federal government and commercial clients. The Global Engineering Solutions segment provides large-scale environmental remediation, clean energy, platform engineering, sustainment and supply chain management across all seven continents for the U.S. government and allied nations. As a result of this change, prior year segment disclosures have been recast to reflect the current reportable segment structure.
Basis of Presentation	Certain information and note disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted, although the Company believes that the disclosures made are adequate to make the information presented not misleading.
Consolidation	All intercompany transactions and balances have been eliminated in consolidation.
Accounting Standards Updates Issued but Not Yet Adopted	Accounting Standards Updates Issued but Not Yet Adopted In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve reportable segment disclosure requirements. This update requires disclosure of significant segment expenses and other segment items in annual and interim periods. ASU 2023-07 is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The amendment requires retrospective application to all prior periods presented in the financial statements and early adoption is permitted. We are currently evaluating the impacts of the new standard on our consolidated financial statements. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, to enhance transparency and usefulness of income tax disclosures. This update requires disaggregated information about an entity’s effective tax rate reconciliation as well as information on income taxes paid. ASU 2023-09 is effective for fiscal years beginning after December 15, 2024, and may be applied on a prospective or retrospective basis. Early adoption is permitted. We are currently evaluating the impacts of the new standard on our consolidated financial statements.
Joint Ventures	The Company’s joint ventures provide services to customers including program management and operations and maintenance services. Joint ventures, the combination of two or more partners, are generally formed for a specific project. Management of the joint venture is typically controlled by a joint venture executive committee, comprised of representatives from the joint venture partners. The joint venture executive committee normally provides management oversight and controls decisions which could have a significant impact on the joint venture. We account for joint ventures in accordance with ASC 810, Consolidation. The Company analyzes its joint ventures and classifies them as either: •a VIE that must be consolidated because the Company is the primary beneficiary or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or •a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest.

Revenues (Tables)

3 Months Ended

Dec. 27, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

Disaggregated revenues by customer-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Department of Defense and U.S. Intelligence Community	$	722	$	1,046	$	1,768	$	351	$	952	$	1,303
Other U.S. Government Agencies	416		600		1016		87		373		460
Commercial and International	148		484		632		21		199		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by contract-type were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Cost-plus-fee	$	785	$	1,381	$	2,166	$	219	$	1,035	$	1,254
Fixed-price	359		472		831		155		354		509
Time-and-materials	142		277		419		85		135		220
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Disaggregated revenues by prime contractor versus subcontractor were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Prime contractor	$	1,164	$	1,878	$	3,042	$	409	$	1,351	$	1,760
Subcontractor	122		252		374		50		173		223
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Revenues by geographic location are reported by the country in which the work is performed and were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
United States	$	1,222	$	1,263	$	2,485	$	384	$	1,063	$	1,447
International	64		867		931		75		461		536
Total revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

Schedule of Changes in Estimated Contract Earnings

Changes in estimated contract earnings at completion using the cumulative catch-up method of accounting were recognized in revenues as follows:


	Three Months Ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Favorable earnings at completion adjustments	$	32	$	24
Unfavorable earnings at completion adjustments	(24)		(17)
Net favorable adjustments	$	8	$	7

Impact on diluted earnings per share attributable to common shareholders (1)	$	0.02	$	0.07

(1) The impact on diluted loss per share attributable to common shareholders is calculated using our statutory rate.

The Company's contract balances consisted of the following (in millions):


		As of
Description of Contract Related Balance	Classification	December 27, 2024		September 27, 2024
Billed and billable receivables	Accounts receivable, net	$	1,443	$	1,378
Contract assets	Accounts receivable, net	927		986
Related party receivables	Accounts receivable, net	35		37
Long-term contract assets	Other long-term assets	138		138
Contract liabilities - deferred revenues and other contract liabilities	Contract liabilities	(143)		(113)

Contract Balances (Tables)

3 Months Ended

Dec. 27, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Contract Balances

Changes in estimated contract earnings at completion using the cumulative catch-up method of accounting were recognized in revenues as follows:


	Three Months Ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Favorable earnings at completion adjustments	$	32	$	24
Unfavorable earnings at completion adjustments	(24)		(17)
Net favorable adjustments	$	8	$	7

Impact on diluted earnings per share attributable to common shareholders (1)	$	0.02	$	0.07

(1) The impact on diluted loss per share attributable to common shareholders is calculated using our statutory rate.

The Company's contract balances consisted of the following (in millions):


		As of
Description of Contract Related Balance	Classification	December 27, 2024		September 27, 2024
Billed and billable receivables	Accounts receivable, net	$	1,443	$	1,378
Contract assets	Accounts receivable, net	927		986
Related party receivables	Accounts receivable, net	35		37
Long-term contract assets	Other long-term assets	138		138
Contract liabilities - deferred revenues and other contract liabilities	Contract liabilities	(143)		(113)

Sales of Receivables (Tables)

3 Months Ended

Dec. 27, 2024

Transfers and Servicing of Financial Assets [Abstract]

Summary of MARPA Activity

The Company's MARPA activity consisted of the following (in millions):


	As of and for the Three Months Ended December 27, 2024

Beginning balance:	$	177
Sales of receivables	952
Cash collections	(945)
Outstanding balance sold to Purchaser (1)	184
Cash collected, not remitted to Purchaser (2)	(18)
Remaining sold receivables	$	166

(2) Includes the cash collected on behalf of but not yet remitted to the Purchaser as of December 27, 2024. This balance is included in Other accrued liabilities as of the balance sheet date.

Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 27, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in the Carrying Amount of Goodwill

The table below presents changes in the carrying amount of goodwill for the periods presented:


(Amounts in millions)	Total
Balance as of September 27, 2024	$	5,556
Acquisition of CMS (1)	32
Balance as of December 27, 2024	$	5,588

(1) Represents changes to goodwill resulting from measurement period adjustments recorded in fiscal year 2025 associated with the acquisition of CMS purchase price allocation.

Schedule of Intangible Assets, Net

Intangible assets, net consisted of the following:


	December 27, 2024						September 27, 2024
(Amounts in millions)	Gross Carrying Value		Accumulated Amortization		Net		Gross Carrying Value		Accumulated Amortization		Net
Backlog	$	931	$	(628)	$	303	$	931	$	(552)	$	379
Customer relationship intangible assets	2,781		(594)		2,187		2,781		(550)		2,231
Capitalized software	23		(10)		13		23		(10)		13
Total intangible assets, net	$	3,735	$	(1,232)	$	2,503	$	3,735	$	(1,112)	$	2,623

Debt (Tables)

3 Months Ended

Dec. 27, 2024

Debt Disclosure [Abstract]

Schedule Of Debt

Debt consisted of the following:


	As of
(Amounts in millions)	December 27, 2024		September 27, 2024
Term Loan	$	3,750	$	3,750
Senior notes	1,000		1,000
Other	15		17
Total debt	4,765		4,767
Unamortized original issue discount and unamortized deferred financing costs	(85)		(88)
Total debt, net of original issue discount and deferred financing costs	4,680		4,679
Less current portion of long-term debt	(44)		(36)
Total long-term debt, net of current portion	$	4,636	$	4,643

Joint Ventures (Tables)

3 Months Ended

Dec. 27, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Selected Financial Information for our Consolidated Joint Ventures VIEs

The following table presents selected financial information for our consolidated joint ventures that are VIEs as of December 27, 2024 and September 27, 2024:


	As of
(Amounts in millions)	December 27, 2024		September 27, 2024
Cash and cash equivalents	$	143	$	160
Current assets	305		322
Non-current assets	3		2
Total assets	$	451	$	484

Current liabilities	$	160	$	190
Non-current liabilities	1		1
Total liabilities	161		191

Total Amentum equity	226		228
Non-controlling interests	64		65
Total equity	290		293
Total liabilities and equity	$	451	$	484

The following table presents selected financial information for our consolidated joint ventures that are VIEs for the three months ended December 27, 2024 and December 29, 2023:


	For the three months ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Revenues	$	376	$	69
Cost of revenues	(336)		(58)
Net income	39		10

Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Dec. 27, 2024

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)


	Gain (Loss) on Derivative Instruments		Foreign Currency Translation Adjustments		Pension Related Adjustments		Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss)


(Amounts in millions)
Balance at September 27, 2024	$	(22)	$	3	$	55	$	(13)	$	23
Other comprehensive (loss) income before reclassification	25		(18)		—		(4)		3
Amounts reclassified from accumulated other comprehensive (loss) income	(3)		—		—		—		(3)
Balance at December 27, 2024	$	—	$	(15)	$	55	$	(17)	$	23


	Gain (Loss) on Derivative Instruments		Foreign Currency Translation Adjustments		Pension Related Adjustments		Income Tax (Provision) Benefit Related to Items of Other Comprehensive Income (Loss)		Accumulated Other Comprehensive Income (Loss)


(Amounts in millions)
Balance at September 29, 2023	$	25	$	(5)	$	46	$	(18)	$	48
Other comprehensive (loss) income before reclassification	(27)		6		—		4		(17)
Amounts reclassified from accumulated other comprehensive (loss) income	(2)		—		—		—		(2)
Balance at December 29, 2023	$	(4)	$	1	$	46	$	(14)	$	29

Segment Information (Tables)

3 Months Ended

Dec. 27, 2024

Segment Reporting [Abstract]

Summary of Segment Reporting Informaton

The Company’s segment revenues were as follows:


	Three months ended
	December 27, 2024						December 29, 2023
(Amounts in millions)	DS		GES		Total		DS		GES		Total
Revenues	$	1,286	$	2,130	$	3,416	$	459	$	1,524	$	1,983

The following table reconciles segment Adjusted EBITDA to net income (loss) attributable to common shareholders:


	Three months ended
(Amounts in millions)	December 27, 2024		December 29, 2023
Adjusted EBITDA by segment
DS	$	100	$	38
GES	162		116
Adjusted EBITDA attributable to Amentum Holdings, Inc.	262		154
Depreciation expense	(9)		(7)
Amortization of intangibles	(120)		(56)
Interest expense and other, net	(87)		(111)
Non-controlling interests	9		2
Acquisition, transaction and integration costs1	(9)		(7)
Utilization of fair market value adjustments2	2		1
Share-based compensation3	(3)		(1)
Income (loss) before income taxes	45		(25)
Provision for income taxes	(24)		(14)
Net income (loss)	21		(39)
Non-controlling interests	(9)		(2)
Net income (loss) attributable to common shareholders	$	12	$	(41)

(1) Represents acquisition, transaction and integration costs, including severance, retention, and other adjustments related to acquisition and integration activities.

(3) Represents non-cash compensation expenses recognized for share based arrangements.

Earnings (Loss) Per Share (Tables)

3 Months Ended

Dec. 27, 2024

Earnings Per Share [Abstract]

Schedule of Earnings (Loss) Per Share

Basic and diluted earnings (loss) per share are computed as follows (in millions, except per share data):


	For the three months ended
	December 27, 2024		December 29, 2023
Net income (loss) attributable to common shareholders	$	12	$	(41)
Weighted-average number of basic shares outstanding during the period	243		90

Weighted-average number of diluted shares outstanding during the period	243		90
Basic earnings (loss) per share	$	0.05	$	(0.46)
Diluted earnings (loss) per share	$	0.05	$	(0.46)

Basis of Presentation (Details)	3 Months Ended
Basis of Presentation (Details)	Dec. 27, 2024 segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	2

Acquisitions (Details) - USD ($) $ in Millions			3 Months Ended
Acquisitions (Details) - USD ($) $ in Millions	Sep. 27, 2024	Sep. 26, 2024	Dec. 27, 2024
Business Acquisition [Line Items]
Common stock, issued (shares)	243,302,173		243,302,257
Common stock, outstanding (shares)	243,302,173		243,302,257
Fair value adjustments, increase to goodwill			$ 32
Fair value adjustments, decrease to deferred tax liabilities			10
CMS
Business Acquisition [Line Items]
Percentage of issued and outstanding shares held in escrow	4.50%
Fair value adjustments, increase to goodwill			32
Fair value adjustments, increase to other current liabilities			20
Fair value adjustments, decrease to accounts receivable			$ 22
CMS \| Backlog
Business Acquisition [Line Items]
Intangible assets acquired	$ 270
Intangible assets, useful life	1 year
CMS \| Customer relationship intangible assets
Business Acquisition [Line Items]
Intangible assets acquired	$ 1,590
Intangible assets, useful life	14 years
Jacobs Solutions Inc. And Shareholders
Business Acquisition [Line Items]
Percentage of issued and outstanding shares of common stock held	58.50%
Amentum Equityholder
Business Acquisition [Line Items]
Percentage of issued and outstanding shares of common stock held	37.00%
Jacobs Solutions Inc. \| CMS
Business Acquisition [Line Items]
Payments of dividends		$ 911

Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,416	$ 1,983
United States
Disaggregation of Revenue [Line Items]
Total revenues	2,485	1,447
International
Disaggregation of Revenue [Line Items]
Total revenues	931	536
Prime contractor
Disaggregation of Revenue [Line Items]
Total revenues	3,042	1,760
Subcontractor
Disaggregation of Revenue [Line Items]
Total revenues	374	223
Cost-plus-fee
Disaggregation of Revenue [Line Items]
Total revenues	2,166	1,254
Fixed-price
Disaggregation of Revenue [Line Items]
Total revenues	831	509
Time-and-materials
Disaggregation of Revenue [Line Items]
Total revenues	419	220
Department of Defense and U.S. Intelligence Community
Disaggregation of Revenue [Line Items]
Total revenues	1,768	1,303
Other U.S. Government Agencies
Disaggregation of Revenue [Line Items]
Total revenues	1,016	460
Commercial and International
Disaggregation of Revenue [Line Items]
Total revenues	632	220
DS
Disaggregation of Revenue [Line Items]
Total revenues	1,286	459
DS \| United States
Disaggregation of Revenue [Line Items]
Total revenues	1,222	384
DS \| International
Disaggregation of Revenue [Line Items]
Total revenues	64	75
DS \| Prime contractor
Disaggregation of Revenue [Line Items]
Total revenues	1,164	409
DS \| Subcontractor
Disaggregation of Revenue [Line Items]
Total revenues	122	50
DS \| Cost-plus-fee
Disaggregation of Revenue [Line Items]
Total revenues	785	219
DS \| Fixed-price
Disaggregation of Revenue [Line Items]
Total revenues	359	155
DS \| Time-and-materials
Disaggregation of Revenue [Line Items]
Total revenues	142	85
DS \| Department of Defense and U.S. Intelligence Community
Disaggregation of Revenue [Line Items]
Total revenues	722	351
DS \| Other U.S. Government Agencies
Disaggregation of Revenue [Line Items]
Total revenues	416	87
DS \| Commercial and International
Disaggregation of Revenue [Line Items]
Total revenues	148	21
GES
Disaggregation of Revenue [Line Items]
Total revenues	2,130	1,524
GES \| United States
Disaggregation of Revenue [Line Items]
Total revenues	1,263	1,063
GES \| International
Disaggregation of Revenue [Line Items]
Total revenues	867	461
GES \| Prime contractor
Disaggregation of Revenue [Line Items]
Total revenues	1,878	1,351
GES \| Subcontractor
Disaggregation of Revenue [Line Items]
Total revenues	252	173
GES \| Cost-plus-fee
Disaggregation of Revenue [Line Items]
Total revenues	1,381	1,035
GES \| Fixed-price
Disaggregation of Revenue [Line Items]
Total revenues	472	354
GES \| Time-and-materials
Disaggregation of Revenue [Line Items]
Total revenues	277	135
GES \| Department of Defense and U.S. Intelligence Community
Disaggregation of Revenue [Line Items]
Total revenues	1,046	952
GES \| Other U.S. Government Agencies
Disaggregation of Revenue [Line Items]
Total revenues	600	373
GES \| Commercial and International
Disaggregation of Revenue [Line Items]
Total revenues	$ 484	$ 199

Revenues - Schedule of Changes in Estimated Contract Earnings (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Revenue from Contract with Customer [Abstract]
Favorable earnings at completion adjustments	$ 32	$ 24
Unfavorable earnings at completion adjustments	(24)	(17)
Net favorable adjustments	$ 8	$ 7
Impact on diluted earnings per share attributable to common shareholders (USD per share)	$ 0.02	$ 0.07

Revenues - Narrative (Details) $ in Billions	Dec. 27, 2024 USD ($)
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 12.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-12-28 \| Reamining Performance Obligation Period 1
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	68.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-12-28 \| Reamining Performance Obligation Period 2
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, percentage	86.00%
Revenue, remaining performance obligation, expected timing of satisfaction, period	24 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-12-28
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction, period

Contract Balances - Schedule of Contract Balance (Details) - USD ($) $ in Millions	Dec. 27, 2024	Sep. 27, 2024
Capitalized Contract Cost [Line Items]
Contract assets	$ 927	$ 986
Long-term contract assets	138	138
Contract liabilities - deferred revenues and other contract liabilities	(143)	(113)
Nonrelated Party
Capitalized Contract Cost [Line Items]
Accounts receivable, net	1,443	1,378
Equity Method Investee
Capitalized Contract Cost [Line Items]
Accounts receivable, net	$ 35	$ 37

Contract Balances - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Revenue from Contract with Customer [Abstract]
Revenue recognized	$ 65	$ 76

Sales of Receivables (Details) $ in Millions	3 Months Ended
Sales of Receivables (Details) $ in Millions	Dec. 27, 2024 USD ($)
Transfer Of Financial Assets Accounted For As Sales [Roll Forward]
Beginning balance:	$ 177
Sales of receivables	952
Cash collections	(945)
Outstanding balance sold to Purchaser	184
Cash collected, not remitted to Purchaser	(18)
Remaining sold receivables	166
Net cash inflow form sold receivables	$ 7

Goodwill and Intangible Assets - Schedule of Changes in the Carrying Amount of Goodwill (Details) $ in Millions	3 Months Ended
	Dec. 27, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 5,556
Acquisition of CMS	32
Goodwill, ending balance	$ 5,588

Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Millions	Dec. 27, 2024	Sep. 27, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 3,735	$ 3,735
Accumulated Amortization	(1,232)	(1,112)
Total intangible assets, net	2,503	2,623
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	931	931
Accumulated Amortization	(628)	(552)
Total intangible assets, net	303	379
Customer relationship intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,781	2,781
Accumulated Amortization	(594)	(550)
Total intangible assets, net	2,187	2,231
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	23	23
Accumulated Amortization	(10)	(10)
Total intangible assets, net	$ 13	$ 13

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 120	$ 56

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Dec. 27, 2024	Dec. 29, 2023
Income Tax Disclosure [Abstract]
Effective tax rate	53.30%	(56.00%)
Increase in the valuation allowance against deferred tax assets	$ 12	$ 23

Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 27, 2024	Sep. 27, 2024
Debt Instrument [Line Items]
Total debt	$ 4,765	$ 4,767
Unamortized original issue discount and unamortized deferred financing costs	(85)	(88)
Total debt, net of original issue discount and deferred financing costs	4,680	4,679
Less current portion of long-term debt	(44)	(36)
Long-term debt, net of current portion	4,636	4,643
Senior notes
Debt Instrument [Line Items]
Total debt	1,000	1,000
Other
Debt Instrument [Line Items]
Total debt	15	17
Term Loan \| Secured Debt \| Line of Credit
Debt Instrument [Line Items]
Total debt	$ 3,750	$ 3,750

Debt - Narrative (Details) - USD ($)	3 Months Ended
Debt - Narrative (Details) - USD ($)	Dec. 27, 2024	Sep. 27, 2024	Aug. 31, 2024
Interest Rate Swap
Line of Credit Facility [Line Items]
Derivative, notional amount	$ 1,900,000,000
Line of Credit \| Secured Debt
Line of Credit Facility [Line Items]
Periodic payment, principal	$ 9,000,000
Line of Credit \| Credit Agreement \| Secured Debt
Line of Credit Facility [Line Items]
Debt instrument, term	7 years
Line of credit facility, maximum borrowing capacity	$ 3,750,000,000
Line of Credit \| Credit Agreement \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument, term	5 years
Line of credit facility, maximum borrowing capacity	$ 850,000,000
Line of Credit \| Credit Agreement \| Letter of Credit
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	200,000,000
Line of Credit \| Credit Agreement \| Bridge Loan
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	100,000,000
Line of Credit \| New Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	788,000,000	$ 808,000,000
Line of Credit \| New Credit Facility \| Letter of Credit
Line of Credit Facility [Line Items]
Line of credit facility, remaining borrowing capacity	$ 62,000,000	$ 42,000,000
Senior notes
Line of Credit Facility [Line Items]
Debt instrument, face amount			$ 1,000,000,000
Debt instrument, interest rate, stated percentage			7.25%

Joint Ventures - Condensed Financial Statements (Details) - USD ($) $ in Millions	Dec. 27, 2024	Sep. 27, 2024	Dec. 29, 2023	Sep. 29, 2023
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 522	$ 452
Total assets	11,919	11,974
Current liabilities	1,971	1,965
Total liabilities	7,356	7,422
Total Amentum shareholders' equity	4,475	4,460
Non-controlling interests	88	92
Total shareholders' equity	4,563	4,552	$ 358	$ 416
Total liabilities and shareholders' equity	11,919	11,974
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Cash and cash equivalents	143	160
Current assets	305	322
Non-current assets	3	2
Total assets	451	484
Current liabilities	160	190
Non-current liabilities	1	1
Total liabilities	161	191
Total Amentum shareholders' equity	226	228
Non-controlling interests	64	65
Total shareholders' equity	290	293
Total liabilities and shareholders' equity	$ 451	$ 484

Joint Ventures - Condensed Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Variable Interest Entity [Line Items]
Revenues	$ 3,416	$ 1,983
Cost of revenues	(3,055)	(1,789)
Net income	21	(39)
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Revenues	376	69
Cost of revenues	(336)	(58)
Net income	$ 39	$ 10

Joint Ventures - Narrative (Details) $ in Millions	3 Months Ended
Joint Ventures - Narrative (Details) $ in Millions	Dec. 27, 2024 USD ($) investment	Dec. 29, 2023 USD ($)	Sep. 27, 2024 USD ($)
Variable Interest Entity [Line Items]
Number of active joint ventures \| investment	25
Revenues	$ 3,416	$ 1,983
Maximum exposure to losses	124
Equity Method Investee
Variable Interest Entity [Line Items]
Related party receivables due from our equity method investments	35		$ 37
Revenues	$ 44	$ 28
Joint Ventures Investment \| Minimum
Variable Interest Entity [Line Items]
Ownership percentage	10.00%
Joint Ventures Investment \| Maximum
Variable Interest Entity [Line Items]
Ownership percentage	51.00%

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Other comprehensive (loss) income before reclassification, tax	$ (4)	$ 4
Amounts reclassified from accumulated other comprehensive (loss) income, tax	0	0
Beginning balance	4,552	416
Other comprehensive (loss) income, before reclassifications	3	(17)
Amounts reclassified from accumulated other comprehensive (loss) income	(3)	(2)
Ending balance	4,563	358
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, tax	(13)	(18)
Ending balance, tax	(17)	(14)
Beginning balance	23	48
Ending balance	23	29
Gain (Loss) on Derivative Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, before tax	(22)	25
Other comprehensive (loss) income before reclassification and taxes	25	(27)
Amounts reclassified from accumulated other comprehensive (loss) income, before tax	(3)	(2)
Ending balance before tax	0	(4)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, before tax	3	(5)
Other comprehensive (loss) income before reclassification and taxes	(18)	6
Amounts reclassified from accumulated other comprehensive (loss) income, before tax	0	0
Ending balance before tax	(15)	1
Pension Related Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance, before tax	55	46
Other comprehensive (loss) income before reclassification and taxes	0	0
Amounts reclassified from accumulated other comprehensive (loss) income, before tax	0	0
Ending balance before tax	$ 55	$ 46

Segment Information - Narrative (Details)	3 Months Ended
Segment Information - Narrative (Details)	Dec. 27, 2024 segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information - Schedule of Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Segment Reporting Information [Line Items]
Revenues	$ 3,416	$ 1,983
DS
Segment Reporting Information [Line Items]
Revenues	1,286	459
GES
Segment Reporting Information [Line Items]
Revenues	$ 2,130	$ 1,524

Segment Information - Schedule of Adjusted EBITDA to Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Segment Reporting Information [Line Items]
Adjusted EBITDA attributable to Amentum Holdings, Inc.	$ 262	$ 154
Depreciation expense	(9)	(7)
Amortization of intangibles	(120)	(56)
Interest expense and other, net	(87)	(111)
Non-controlling interests	9	2
Acquisition, transaction and integration costs	(9)	(7)
Utilization of fair market value adjustments	2	1
Share-based compensation	(3)	(1)
Income (loss) before income taxes	45	(25)
Provision for income taxes	(24)	(14)
Net income (loss)	21	(39)
Non-controlling interests	(9)	(2)
Net income (loss) attributable to common shareholders	12	(41)
DS
Segment Reporting Information [Line Items]
Adjusted EBITDA attributable to Amentum Holdings, Inc.	100	38
GES
Segment Reporting Information [Line Items]
Adjusted EBITDA attributable to Amentum Holdings, Inc.	$ 162	$ 116

Earnings (Loss) Per Share - Narrative (Details) - shares		3 Months Ended
	Sep. 27, 2024	Dec. 29, 2023
Earnings Per Share [Abstract]
Converted shares (in shares)	90,021,804
Anti-dilutive shares (in shares)		0

Earnings (Loss) Per Share - Basic and Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to common shareholders	$ 12	$ (41)
Weighted-average number of basic shares outstanding during the period (in shares)	243	90
Weighted-average number of diluted shares outstanding during the period (in shares)	243	90
Basic earnings (loss) per share (in dollars per share)	$ 0.05	$ (0.46)
Diluted earnings (loss) per share (in dollars per share)	$ 0.05	$ (0.46)

Legal Proceedings and Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2020	Dec. 27, 2024	Sep. 27, 2024
Loss Contingencies [Line Items]
Estimate of possible loss		$ 138	$ 138
Other long-term liabilities		$ 125	$ 125
AECOM Energy & Construction Inc.
Loss Contingencies [Line Items]
Percentage of claim recovery and costs assumed	10.00%
Percentage of claim recovery and costs retained by seller	90.00%

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