Sharon Mates - 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, 18:00:47 UTC
Prior SEC filing: 26 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Lana Gladstein, Attorney-in-Fact

Key filing fact

Sharon Mates filed Form 4 for Seaport Therapeutics, Inc. (SPTX) on 04 May 2026.

Key facts

This page summarizes Sharon Mates's Form 4 filing for Seaport Therapeutics, Inc. (SPTX).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 04 May 2026, 18:00.

Change

Previous filing in this sequence was filed on 26 Jan 2026.
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 0001585699 Primary reporting owner

Mates Sharon

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 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: +49,033
Change %
Price: $0.000000^*
Shares after: 49,033
Date: 30 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 49,033
Exercise price: $18.00
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 1 footnote

Footnote F1

1/3rd of the shares underlying this option shall vest and become exercisable on April 30, 2027, with the remaining shares vesting in twenty-four (24) equal monthly installments thereafter, subject to the Reporting Person's continued service on each such vesting date.