Bryan Giraudo - Mar 20, 2023 Form 4 Insider Report for Gossamer Bio, Inc. (GOSS)

Role: COO/CFO
Signature: /s/ Jeff Boerneke, Attorney-in-Fact
Stock symbol: GOSS
Transactions as of: Mar 20, 2023
Transactions value $: $48,435
Form type: 4
Date filed: 3/22/2023, 05:17 PM
Previous filing: Jan 18, 2023
Next filing: Apr 5, 2023

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GOSS	Common Stock	Purchase	$48.4K	+50K	+238.21%	$0.97	71K	Mar 20, 2023	By family trust
holding	GOSS	Common Stock						99.2K	Mar 20, 2023	Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	GOSS	Stock Option (Right to Buy)	Award	$0	+212K		$0.00	212K	Mar 20, 2023	Common Stock	212K	$1.21	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	25% of the total number of shares subject to the option will vest on March 20, 2024 and 1/48th of the total number of shares subject to the option vest on the last day of each one-month period thereafter, subject to the Reporting Person's continuous service to the Issuer on each such vesting date.