Initial Statement of Beneficial Ownership (Form 3)

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * GAP Coinvestments CDA, L.P. 2. Date of Event Requiring Statement (Month/Day/Year) 05/04/2026 3. Issuer Name and Ticker or Trading Symbol Seaport Therapeutics, Inc. [SPTX] (Last) (First) (Middle) C/O GENERAL ATLANTIC SERVICE CO., L.P., 55 EAST 52ND STREET, 33RD FLOOR 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) 5. If Amendment, Date Original Filed (Month/Day/Year) (Street) NEW YORK, NY 10055 6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock, par value $0.0001 per share ("Common Stock") 6,101,582 I See footnote(1)(2)(3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
GAP Coinvestments CDA, L.P. C/O GENERAL ATLANTIC SERVICE CO., L.P. 55 EAST 52ND STREET, 33RD FLOOR NEW YORK, NY 10055	X	X
General Atlantic Partners (Lux), SCSp 412F, ROUTE D'ESCH LUXEMBOURG L-1471	X	X
General Atlantic (Lux) S.a r.l. 412F, ROUTE D'ESCH LUXEMBOURG L-1471	X	X
General Atlantic GenPar (Lux) SCSp 412F, ROUTE D'ESCH LUXEMBOURG L-1471	X	X

Signatures

/s/ Michael Gosk		05/06/2026
**Signature of Reporting Person		Date
/s/ Ingrid van der Hoorn		05/06/2026
**Signature of Reporting Person		Date
/s/ Ingrid van der Hoorn		05/06/2026
**Signature of Reporting Person		Date
/s/ Ingrid van der Hoorn		05/06/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Reflects 6,101,582 shares of Common Stock held by General Atlantic (SP), L.P., or General Atlantic SP, including 3,351,582 shares of Common Stock issuable upon conversion of Series B preferred stock. The limited partners that share beneficial ownership of the shares held by General Atlantic SP, or the GA Funds, are General Atlantic Partners 100, L.P., or GAP 100, General Atlantic Partners (Lux), SCSp, or GAP Lux, GAP Coinvestments III, LLC, or GAPCO III, GAP Coinvestments IV, LLC, or GAPCO IV, GAP Coinvestments V, LLC, or GAPCO V, and GAP Coinvestments CDA, L.P., or GAPCO CDA. The general partner of GAP 100 is General Atlantic GenPar, L.P., (Cont'd in FN2)
(2)	(Cont'd from FN1) or GA GenPar. General Atlantic, L.P., or GA LP, which is controlled by the Partnership Committee of GASC MGP, LLC (the "Partnership Committee"), is the managing member of GAPCO III, GAPCO IV and GAPCO V, the general partner of GAPCO CDA and GA GenPar, and the sole member of General Atlantic (SPV) GP, LLC, or GA SPV. The general partner of General Atlantic SP is GA SPV. The general partner of GAP Lux is General Atlantic GenPar, (Lux) SCSp, or GA GenPar Lux, and the general partner of GA GenPar Lux is General Atlantic (Lux) S.a r.l., or GA Lux. The sole shareholder of GA Lux is General Atlantic GenPar (Bermuda), L.P., or GenPar Bermuda. GAP (Bermuda) L.P., or GAP Bermuda, which is ultimately controlled by the Partnership Committee, is the general partner of GenPar Bermuda. (Cont'd in FN3)
(3)	(Cont'd from FN2) There are six members of the Partnership Committee. Each of the members of the Partnership Committee disclaims ownership of the shares except to the extent that he or she has a pecuniary interest therein.
Remarks: GA LP, GAP Bermuda, GA Lux, GA GenPar Lux, GA SPV, and the GA Funds may be deemed to be members of a "group" for the purposes of the Securities Exchange Act of 1934. Each reporting person disclaims beneficial ownership of any securities deemed to be owned by the group that are not directly owned by the reporting person. This report shall not be deemed an admission that the reporting persons are a member of a group or the beneficial owner of any securities not directly owned by the reporting person. Each of the reporting persons is a director-by-deputization solely for purposes of Section 16 of the Exchange Act. // Form 2 of 2

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