Lauren White - 30 Apr 2026 Form 4 Insider Report for Seaport Therapeutics, Inc. (SPTX)

Reporting relationship: Chief Financial Officer
Issuer ticker: SPTX
Reported as of: 30 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 04 May 2026, 18:13:52 UTC
Prior SEC filing: 12 Feb 2024
Source filing: View source filing
Reporting owner signature: /s/ Lana Gladstein, Attorney-in-Fact

Key filing fact

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

Key facts

This page summarizes Lauren White's Form 4 filing for Seaport Therapeutics, Inc. (SPTX).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 04 May 2026, 18:13.

Change

Previous filing in this sequence was filed on 12 Feb 2024.
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 0001864430 Primary reporting owner

White Lauren

Relationship: Chief Financial Officer
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: +6,702
Change %
Price
Shares after: 6,702
Date: 04 May 2026
Ownership: By Lauren Anne White Living Trust, dated January 30, 2020
Footnotes: F1, F2

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: +63,680
Change %
Price: $0.000000^*
Shares after: 63,680
Date: 30 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 63,680
Exercise price: $18.00
Footnotes: F3

SPTX transaction Derivative

Series B Preferred Stock

Conversion of derivative security

Transaction value
Shares: -21,052
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 04 May 2026
Ownership: By Lauren Anne White Living Trust, dated January 30, 2020
Underlying class: Common Stock
Underlying amount: 6,702
Exercise price
Footnotes: F1, F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 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 Reporting Person disclaims beneficial ownership of such shares for purposes of Section 16 of the Exchange Act, except to the extent of her pecuniary interest therein, if any. This report shall not be deemed an admission that she is a beneficial owner of such shares for the purpose of Section 16 of the Exchange Act, or for any other purpose.

Footnote F3

The shares underlying this option shall vest in forty-eight (48) equal monthly installments following April 30, 2026, subject to the Reporting Person's continued service on each such vesting date.