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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1728117	Gossamer Bio Inc.	GOSS	()	4

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1361712	Otello Stampacchia	185 Dartmouth Street Boston MA 02116	Yes	No	Yes	No
1641348	Omega Fund V Gp Manager, Ltd.	888 Boylston Street, Suite 1111 Boston MA 02199	No	No	Yes	No
1641354	Omega Fund V, L.p.	888 Boylston Street, Suite 1111 Boston MA 02199	No	No	Yes	No
1641355	Omega Fund V Gp, L.p.	888 Boylston Street, Suite 1111 Boston MA 02199	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2019-09-05	12,704	$21.60	6,940,712	No	4	S	Direct
Common Stock	Disposition	2019-09-06	8,700	$21.51	6,932,012	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Footnotes

The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.50 to $21.87 per share, inclusive.
The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.50 to $21.56 per share, inclusive.
The reported securities are held directly by Omega Fund V, L.P. ("Omega V"). The reported securities may be deemed to be beneficially owned by each of Omega Fund V GP, L.P. ("Omega V GP"), as the general partner of Omega V, and Omega Fund V GP Manager, Ltd. ("Omega V GP Manager"), as the general partner of Omega V GP. Otello Stampacchia, Richard Lim, Anne-Mari Paster and Claudio Nessi (the "Omega Directors") are all the shareholders and directors of Omega V GP Manager and have shared voting and investment power over the shares held by Omega V. Each of Omega V GP, Omega Fund V GP Manager and the Omega Directors disclaims beneficial ownership of the securities reported herein, except to the extent of its or their pecuniary interest therein, if any. Otello Stampacchia is also a member of the issuer's board of directors.