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

Role: COO/CFO
Signature: /s/ Jeff Boerneke, Attorney-in-Fact
Issuer symbol: GOSS
Transactions as of: 20 Mar 2023
Net transactions value: +$48,435
Form type: 4
Filing time: 22 Mar 2023, 17:17:06 UTC
Previous filing: 18 Jan 2023
Next filing: 05 Apr 2023
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	GOSS	Common Stock	Purchase	$48,435	+50,000	+238%	$0.9687	70,990	20 Mar 2023	By family trust
holding	GOSS	Common Stock						99,167	20 Mar 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	+211,500		$0.000000	211,500	20 Mar 2023	Common Stock	211,500	$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.