John D. Quisel - 23 Sep 2026 Form 4 Insider Report for Gossamer Bio, Inc. (GOSS)

Reporting relationship: Director
Issuer ticker: GOSS
Reported as of: 23 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 25 Sep 2026, 16:51:22 UTC
Prior SEC filing: 16 Sep 2026
Source filing: View source filing
Reporting owner signature: /s/ Christian Waage, Attorney-in-Fact

Key filing fact

John D. Quisel filed Form 4 for Gossamer Bio, Inc. (GOSS) on 25 Sep 2026.

Key facts

This page summarizes John D. Quisel's Form 4 filing for Gossamer Bio, Inc. (GOSS).
1 reported transaction and 1 derivative row are listed below.
Accepted by SEC: 25 Sep 2026, 16:51.

Change

Previous filing in this sequence was filed on 16 Sep 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 0001586788 Primary reporting owner

Quisel John D

Relationship: Director
Address: 3115 MERRYFIELD ROW, SUITE 120, SAN DIEGO
Signature: /s/ Christian Waage, Attorney-in-Fact
Signature date: 25 Sep 2026

Reported derivative securities

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

GOSS transaction Derivative

Stock Option (Right to Buy)

Award

Transaction value
Shares: +10,000
Change %
Price: $0.000000^*
Shares after: 10,000
Date: 23 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 10,000
Exercise price: $10.99
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

The entire number of shares subject to this option becomes fully vested and exercisable on the first anniversary of the grant date, subject to the Reporting Person's continued service on the board of directors of the Issuer through such vesting date.