Company filings profile · CIK 0001728117
Gossamer Bio, Inc. — SEC filings & insider activity.
Real, source-linked SEC EDGAR activity for Gossamer Bio, Inc. (GOSS): 24 filings in the last 90 days vs 26 in the prior 90 (filing-velocity steady · 0.92×). Latest material 8-K events, insider Form-4 transactions, and periodic reports — monitored for change.
✔ Verified against the public SEC EDGAR filing record as of Sep 19, 2026. Source-linked, daily-refreshed.
Material 8-K events — Gossamer Bio, Inc.
8-K disclosures decoded by item code (the material events: agreements, results, control/management changes, impairments, restatements).
| Filed | Event | |
|---|---|---|
| Sep 16, 2026 | Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| Sep 11, 2026 | Item 3.03; Amendments to Bylaws/Charter; Other Events; Financial Statements and Exhibits | ↗ |
| Sep 9, 2026 | Other Events; Financial Statements and Exhibits | ↗ |
| Sep 3, 2026 | Amendments to Bylaws/Charter; Financial Statements and Exhibits | ↗ |
| Aug 26, 2026 | Amendments to Bylaws/Charter; Financial Statements and Exhibits | ↗ |
| Aug 21, 2026 | Entry into a Material Agreement; Unregistered Sale of Securities; Amendments to Bylaws/Charter; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Aug 13, 2026 | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Jul 27, 2026 | Entry into a Material Agreement; Termination of a Material Agreement; Results of Operations (earnings); Regulation FD Disclosure; Other Events; Financial Statements and Exhibits | ↗ |
| Jul 15, 2026 | Departure/Election of Directors or Officers; Amendments to Bylaws/Charter; Item 5.07; Financial Statements and Exhibits | ↗ |
| Jul 1, 2026 | Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 17, 2026 | Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 5, 2026 | Entry into a Material Agreement; Termination of a Material Agreement; Material Direct Financial Obligation; Unregistered Sale of Securities; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 5, 2026 | Item 5.07 | ↗ |
| Jun 2, 2026 | Other Events; Financial Statements and Exhibits | ↗ |
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Recent filings
| Filed | Form | Detail | |
|---|---|---|---|
| Sep 16, 2026 | DEF 14A | DEF 14A | ↗ |
| Sep 16, 2026 | 8-K | Departure/Election of Directors or Officers; Financial Statements and Exhibits | ↗ |
| Sep 11, 2026 | 8-K | Item 3.03; Amendments to Bylaws/Charter; Other Events; Financial Statements and Exhibits | ↗ |
| Sep 9, 2026 | 8-K | Other Events; Financial Statements and Exhibits | ↗ |
| Sep 4, 2026 | D | Item 06b | ↗ |
| Sep 3, 2026 | PRE 14A | PRE 14A | ↗ |
| Sep 3, 2026 | 8-K | Amendments to Bylaws/Charter; Financial Statements and Exhibits | ↗ |
| Aug 26, 2026 | 4 | FORM 4 | ↗ |
| Aug 26, 2026 | 4 | FORM 4 | ↗ |
| Aug 26, 2026 | 4 | FORM 4 | ↗ |
| Aug 26, 2026 | 4 | FORM 4 | ↗ |
| Aug 26, 2026 | 4 | FORM 4 | ↗ |
| Aug 26, 2026 | 8-K | Amendments to Bylaws/Charter; Financial Statements and Exhibits | ↗ |
| Aug 24, 2026 | SCHEDULE 13D/A | ↗ | |
| Aug 21, 2026 | 8-K | Entry into a Material Agreement; Unregistered Sale of Securities; Amendments to Bylaws/Charter; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Aug 13, 2026 | 8-K | Results of Operations (earnings); Financial Statements and Exhibits | ↗ |
| Aug 13, 2026 | 10-Q | 10-Q | ↗ |
| Jul 29, 2026 | SCHEDULE 13G | ↗ | |
| Jul 29, 2026 | SCHEDULE 13G/A | ↗ | |
| Jul 27, 2026 | 8-K | Entry into a Material Agreement; Termination of a Material Agreement; Results of Operations (earnings); Regulation FD Disclosure; Other Events; Financial Statements and Exhibits | ↗ |
| Jul 24, 2026 | SCHEDULE 13D/A | ↗ | |
| Jul 15, 2026 | 8-K | Departure/Election of Directors or Officers; Amendments to Bylaws/Charter; Item 5.07; Financial Statements and Exhibits | ↗ |
| Jul 1, 2026 | SCHEDULE 13D/A | ↗ | |
| Jul 1, 2026 | 8-K | Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 17, 2026 | 8-K | Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 11, 2026 | SCHEDULE 13D | ↗ | |
| Jun 11, 2026 | SCHEDULE 13G | ↗ | |
| Jun 11, 2026 | SCHEDULE 13G | ↗ | |
| Jun 9, 2026 | DEF 14A | DEF 14A | ↗ |
| Jun 9, 2026 | SCHEDULE 13G | ↗ | |
| Jun 5, 2026 | 4 | FORM 4 | ↗ |
| Jun 5, 2026 | 4 | FORM 4 | ↗ |
| Jun 5, 2026 | 4 | FORM 4 | ↗ |
| Jun 5, 2026 | 4 | FORM 4 | ↗ |
| Jun 5, 2026 | 4 | FORM 4 | ↗ |
| Jun 5, 2026 | 4 | FORM 4 | ↗ |
| Jun 5, 2026 | 8-K | Entry into a Material Agreement; Termination of a Material Agreement; Material Direct Financial Obligation; Unregistered Sale of Securities; Regulation FD Disclosure; Financial Statements and Exhibits | ↗ |
| Jun 5, 2026 | 8-K | Item 5.07 | ↗ |
| Jun 2, 2026 | 8-K | Other Events; Financial Statements and Exhibits | ↗ |
| May 18, 2026 | PRE 14A | PRE 14A | ↗ |