WINT Windtree Therapeutics Inc

97382D501

NAME OF REPORTING PERSONS

I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

Deerfield Mgmt, L.P.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ☐

(b) ☒

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

 NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

0

SHARED VOTING POWER

0

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

0

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

0

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0%

TYPE OF REPORTING PERSON*

PN

97382D501 

NAME OF REPORTING PERSONS

I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

Deerfield Management Company, L.P.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ☐

(b) ☒

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

 NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

0

SHARED VOTING POWER

0

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

0

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

0

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0%

TYPE OF REPORTING PERSON*

PN

97382D501 

NAME OF REPORTING PERSONS

I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

Deerfield Private Design Fund II, L.P.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ☐

(b) ☒

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

 NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

0

SHARED VOTING POWER

0

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

0

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

0

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0%

TYPE OF REPORTING PERSON*

PN

97382D501 

NAME OF REPORTING PERSONS

I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

Deerfield PDI Financing II, L.P.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ☐

(b) ☒

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

British Virgin Islands

 NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

0

SHARED VOTING POWER

0

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

0

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

0

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0%

TYPE OF REPORTING PERSON*

PN

97382D501 

NAME OF REPORTING PERSONS

I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)

James E. Flynn

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ☐

(b) ☒

SEC USE ONLY

CITIZENSHIP OR PLACE OF ORGANIZATION

United States

 NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

0

SHARED VOTING POWER

0

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

0

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

0

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

0%

TYPE OF REPORTING PERSON*

IN

97382D501 

Windtree Therapeutics, Inc.

2600 Kelly Road, Suite 100

Warrington, PA 18976

James E. Flynn, Deerfield Mgmt, L.P., Deerfield Private Design Fund II, L.P., Deerfield PDI Financing II, L.P. and Deerfield Management Company, L.P.

James E. Flynn, Deerfield Mgmt, L.P., Deerfield Private Design Fund II, L.P., Deerfield PDI Financing II, L.P. and Deerfield Management Company, 345 Park Avenue South, 12th Floor, New York, NY 10010

Deerfield Mgmt, L.P., Deerfield Management Company, L.P. and Deerfield Private Design Fund II, L.P. - Delaware limited partnerships;

Deerfield PDI Financing II, L.P. – British Virgin Islands limited partnership;

James E. Flynn – United States citizen

Common Stock

97382D501

If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

Broker or dealer registered under Section 15 of the Exchange Act.

Insurance company as defined in Section 3(a)(19) of the Exchange Act.

Investment company registered under Section 8 of the Investment Company Act.

97382D501 

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

Deerfield Mgmt, L.P. - 0 shares

Deerfield Management Company, L.P. - 0 shares

Deerfield Private Design Fund II, L.P. - 0 shares

Deerfield PDI Financing II, L.P. - 0 shares

James E. Flynn – 0 shares

Deerfield Mgmt, L.P. – 0%

Deerfield Management Company, L.P. - 0%

Deerfield Private Design Fund II, L.P. – 0%

Deerfield PDI Financing II, L.P. – 0%

James E. Flynn – 0%

Deerfield Mgmt, L.P. - 0

Deerfield Management Company, L.P. - 0

Deerfield Private Design Fund II, L.P. - 0

Deerfield PDI Financing II, L.P. - 0

James E. Flynn – 0

Sole power to dispose or to direct the disposition of:

Shared power to dispose or to direct the disposition of:

Deerfield Mgmt, L.P. - 0

Deerfield Management Company, L.P. - 0

Deerfield Private Design Fund II, L.P. - 0

Deerfield PDI Financing II, L.P. - 0

James E. Flynn – 0

97382D501 

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities check the following ☒.

If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than five percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

If a parent holding company or Control person has filed this schedule, pursuant to Rule 13d-1(b)(1)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company or control person has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.

If a group has filed this schedule pursuant to ss.240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to ss.240.13d-1(c) or ss.240.13d-1(d), attach an exhibit stating the identity of each member of the group.

Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5.

"By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a–11."

97382D501