Steven M. Paul - 30 Apr 2026 Form 4 Insider Report for Seaport Therapeutics, Inc. (SPTX)

Reporting relationship: Director
Issuer ticker: SPTX
Reported as of: 30 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 04 May 2026, 18:05:45 UTC
Prior SEC filing: 15 Sep 2025
Next SEC filing: 10 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Lana Gladstein, Attorney-in-Fact

Key filing fact

Steven M. Paul filed Form 4 for Seaport Therapeutics, Inc. (SPTX) on 04 May 2026.

Key facts

This page summarizes Steven M. Paul's Form 4 filing for Seaport Therapeutics, Inc. (SPTX).
4 reported transactions and 3 derivative rows are listed below.
Accepted by SEC: 04 May 2026, 18:05.

Change

Previous filing in this sequence was filed on 15 Sep 2025.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001237564 Primary reporting owner

PAUL STEVEN M

Relationship: Director
Address: SEAPORT THERAPEUTICS, INC., 101 SEAPORT BLVD., FLOOR 12, BOSTON
Signature: /s/ Lana Gladstein, Attorney-in-Fact
Signature date: 04 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SPTX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +67,031
Change %: +8.4%
Price
Shares after: 863,031
Date: 04 May 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SPTX transaction Derivative

Stock Option (Right to Buy)

Award

Transaction value
Shares: +12,258
Change %
Price: $0.000000^*
Shares after: 12,258
Date: 30 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 12,258
Exercise price: $18.00
Footnotes: F2

SPTX transaction Derivative

Stock Option (Right to Buy)

Award

Transaction value
Shares: +991,192
Change %
Price: $0.000000^*
Shares after: 991,192
Date: 30 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 991,192
Exercise price: $18.00

SPTX transaction Derivative

Series B Preferred Stock

Conversion of derivative security

Transaction value
Shares: -210,526
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 04 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 67,031
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Each share of Series B Preferred Stock (the "Preferred Stock") was convertible into Common Stock of the Issuer on a one-for-3.1407 basis at the option of the holder, and automatically converted upon the closing of the Issuer's initial public offering without payment of further consideration. The Preferred Stock had no expiration date.

Footnote F2

The shares underlying this option shall vest in full on April 30, 2027, subject to the Reporting Person's continued service on such vesting date.