Gossamer Bio, Inc. (GOSS)

XNASPHARMACEUTICAL PREPARATIONSNet insider buying (90d)Watch GOSS

$0.17+$0.00 (+0.82%) Today

Latest GOSS Insider Trades

Sandra Milligan - Director
Open-market purchase$50K
Aug 19, 2025
Waage Christian - Officer
Grant or award2,900,026 sh
Aug 24, 2026
Caryn Peterson - Officer

About Gossamer Bio, Inc. (GOSS)

Gossamer Bio Inc is a clinical-stage biopharmaceutical company. It focuses on discovering, acquiring, developing, and commercializing therapeutics in the disease areas of immunology, inflammation, and oncology. The company pipeline products include Seralutinib, which address the cellular overgrowth, fibrosis, and vascular remodeling which underlie PAH (pulmonary arterial hypertension).

Headquarters: SAN DIEGO, CA
Employees: 162
Listed: 2019
Exchange: XNAS
Sector: Health Care

https://www.gossamerbio.com SEC filings for GOSS on EDGAR

90-Day SEC Filing Activity

Form 4 transaction type	Transactions	Shares	Total value
Grant or award	13	26,790,421

Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.

GOSS Insider Transactions (Form 4)

134

24 Form 4 filings on record, the earliest from Aug 20, 2025, newest first.

Date	Insider	Transaction	Security	Shares	Price	Value
Aug 24, 2026	Waage Christian - Officer	Grant or award	Stock Option (Right to Buy)

Recent GOSS Form 8-K Filings

Aug 26, 2026Item 5.03, 9.01

Read the filing on SEC EDGAR

Aug 21, 2026Item 1.01, 3.02, 5.03, 7.01, 9.01

Read the filing on SEC EDGAR

Aug 13, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Jul 27, 2026Item 1.01, 1.02, 2.02, 7.01, 8.01, 9.01

Read the filing on SEC EDGAR

GOSS Insider Trading - FAQ

What is the latest insider trade for GOSS?

Gossamer Bio, Inc. (GOSS) had 11 insider filings in the last 90 days, with the most recent on 2026-08-26. The full record for GOSS runs to 24 Form 4 filings, the earliest from 2025-08-20. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.

How many insiders are buying GOSS stock?

No insider purchases of GOSS were filed in the last 90 days. 1 purchase is on record for this company.

How many insiders are selling GOSS stock?

No 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)?

This page tracks GOSS Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.

How can I follow GOSS insider buys?

Create a free InsiderAlpha account and press Watch on this page to add GOSS to your watchlist. A free account also opens the full scored daily plan with every past day and 3 months of price history. No card is required. Sign up at https://insideralpha.ai/register.

More Health Care Companies with Insider Activity

Recent Insider Filings

Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.

Aug 26, 2026 - Waage Christian view on EDGAR
Aug 26, 2026 - Caryn Peterson view on EDGAR
Aug 26, 2026 - Robert Paul Smith Jr. view on EDGAR
Aug 26, 2026 - Bryan Giraudo view on EDGAR
Aug 26, 2026 - Faheem Hasnain view on EDGAR
Jun 5, 2026 - John D. Quisel view on EDGAR
Jun 5, 2026 - Skye Drynan view on EDGAR
Jun 5, 2026 - Thomas O. Daniel view on EDGAR
Jun 5, 2026 - Russell J. Cox view on EDGAR

Related Companies - Recent Insider Activity

Learn More

What is SEC Form 4?: The filing insiders must submit within two business days of a trade, and how to read its transaction codes.
Insider activity in Health Care: Where GOSS's peers are being bought and sold.
Every recent Form 4: The full market-wide feed, updated as filings arrive from SEC EDGAR.

Track GOSS insider activity as it files

Real-time Form 4 alerts, AI-scored daily trade ideas and 10b5-1 plan flags.