Gossamer Bio, Inc. — Director's Dealing 2019

Dec 31, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Gossamer Bio, Inc. (GOSS)
CIK: 0001728117
Period of Report: 2019-12-27

Reporting Person: Dupont Jakob (Chief Medical Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-12-27	Common Stock	M	1994	$10.71	Acquired	1994	Direct
2019-12-27	Common Stock	S	1994	$15.8145	Disposed	0	Direct
2019-12-30	Common Stock	M	40000	$10.71	Acquired	40000	Direct
2019-12-30	Common Stock	S	40000	$15.0001	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-12-27	Non-qualified stock option (Right to Buy)	$10.71	M	1994	Disposed	2028-12-13	Common Stock (1994)	Direct
2019-12-30	Non-qualified stock option (Right to Buy)	$10.71	M	40000	Disposed	2028-12-13	Common Stock (40000)	Direct

Footnotes

F1: The option was granted on December 14, 2018. 25% of the total number of shares subject to the option vested on December 14, 2019 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 Corporation on each such vesting date.