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CIK 0001728117 · Non-accelerated filer<br>Smaller reporting company

Gossamer Bio, Inc.

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Ticker
GOSS
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
FY end
Dec 31
Incorporated
DE
Entity type
operating
EIN
475461709
Phone
(858) 684-1300
Business address
3115 MERRYFIELD ROW, SUITE 120, SAN DIEGO, CA, 92121
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$0
in 0 filings

Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Reading 100 more Form 4s from the SEC; this list fills in as they're read.

Date Insider Transaction Shares Price Value Owned after
2026-03-19 Hasnain Faheem President & CEO Returned to the company · Stock Option (Right to Buy) −650,000 0
2026-03-19 Hasnain Faheem President & CEO Returned to the company · Stock Option (Right to Buy) −325,000 0
2026-03-19 Hasnain Faheem President & CEO Returned to the company · Stock Option (Right to Buy) −47,000 0
2026-03-19 Hasnain Faheem President & CEO Returned to the company · Stock Option (Right to Buy) −43,500 0
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +1,680,000 1,680,000
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +1,540,000 1,540,000
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +1,312,500 1,312,500
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +437,500 437,500
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +544,500 544,500
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +544,500 544,500
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +650,000 650,000
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +325,000 325,000
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +47,000 47,000
2026-03-19 Hasnain Faheem President & CEO Grant or award · Stock Option (Right to Buy) +43,500 43,500
2026-01-02 Smith Robert Paul JR Chief Commercial Officer Grant or award +93,750 260,898
2026-01-02 Smith Robert Paul JR Chief Commercial Officer Grant or award · Stock Option (Right to Buy) +562,500 562,500
2026-01-02 Aranda Richard Chief Medical Officer Grant or award +93,750 463,106
2026-01-02 Aranda Richard Chief Medical Officer Grant or award · Stock Option (Right to Buy) +562,500 562,500
2026-01-02 Peterson Caryn EVP, Regulatory Affairs Grant or award +84,500 259,333
2026-01-02 Peterson Caryn EVP, Regulatory Affairs Grant or award · Stock Option (Right to Buy) +506,250 506,250

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