Gossamer Bio, Inc. (GOSS) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-06-05

Gossamer Bio, Inc. (GOSS) has filed 6 SEC Form 4 insider transactions in the last 90 days, with the most recent on 2026-06-05. 7 Form 8-K material event filings were reported by GOSS in the last 90 days. InsiderAlpha tracks every GOSS SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Gossamer Bio, Inc. (GOSS)

SIC classification	Pharmaceutical Preparations (SIC 2834)
SEC CIK	0001728117

90-Day SEC Filing Activity

Form 4 filings (90d)	6
Form 8-K filings (90d)	7
Latest Form 4 filing	2026-06-05

Recent GOSS Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2025-10-01	Hasnain Faheem	President CEO	A — Grant or award	437.5K	$0.00	—	SEC
2025-10-01	Christian Waage	EVP, Tech Ops and Admin	A — Grant or award	125.0K	$0.00	—	SEC
2025-10-01	Peterson Caryn	EVP, Regulatory Affairs	A — Grant or award	125.0K	$0.00	—	SEC
2025-10-01	Aranda Richard	Chief Medical Officer	A — Grant or award	162.5K	$0.00	—	SEC
2025-10-01	Giraudo Bryan	COO/CFO	A — Grant or award	181.2K	$0.00	—	SEC
2025-10-01	Smith Robert Paul JR	Chief Commercial Officer	A — Grant or award	162.5K	$0.00	—	SEC
2025-08-19	Milligan Sandra	Director	P — Open-market purchase	26.1K	$1.92	$50K	SEC

All transactions sourced from SEC EDGAR Form 4 filings for Gossamer Bio, Inc. (GOSS). Updated in real time as new filings are submitted to the SEC.

Most-Active GOSS Insiders — Last 90 Days

Insider	Form 4 filings	Total transaction value
Quisel John D	1	—
Milligan Sandra	1	—
Drynan Skye	1	—
Daniel Thomas O	1	—
Cox Russell J.	1	—

Recent GOSS Form 8-K Material Events

2026-07-15 — Item 5.02, 5.03, 5.07, 9.01 [SEC]
2026-07-01 — Item 7.01, 9.01 [SEC]
2026-06-17 — Item 7.01, 9.01 [SEC]
2026-06-04 — Item 1.01, 1.02, 2.03, 3.02, 7.01, 9.01 [SEC]
2026-06-04 — Item 5.07 [SEC]

Recent Insider Filings

2026-06-05 — Quisel John D (Director)
2026-06-05 — Drynan Skye (Director)
2026-06-05 — Daniel Thomas O (Director)
2026-06-05 — Cox Russell J. (Director)
2026-06-05 — Milligan Sandra (Director)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in GOSS insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

GOSS Insider Trading — FAQ

What is the latest insider trade for GOSS?: Gossamer Bio, Inc. (GOSS) had 6 insider filings in the last 90 days, with the most recent on 2026-06-05. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying GOSS stock?: 0 insider purchases of GOSS were filed in the last 90 days.
How many insiders are selling GOSS stock?: 0 insider sales of GOSS were filed in the last 90 days.
Where can I see GOSS SEC filings (Form 4, 10-K, 10-Q, 8-K)?: InsiderAlpha aggregates every GOSS SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

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