Gossamer Bio, Inc. SEC filings GOSS
Gossamer Bio, Inc. has 484 filings in SEC EDGAR's recent list, going back to Jan 19, 2018. Its latest annual report, Form ARS, was filed on Apr 24, 2026 for the period ended Apr 24, 2026. The latest quarterly report (Form 10-Q) was filed on Aug 13, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Oct 28, 2026 (shareholder vote results). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Shareholder vote results
|
Oct 28, 2026 | Oct 27, 2026 |
| 8-K |
Current report
Other events
|
Sep 28, 2026 | Sep 25, 2026 |
| 8-K |
Current report
Other events
|
Sep 23, 2026 | Sep 23, 2026 |
| DEF 14A | Proxy statement | Sep 16, 2026 | Oct 27, 2026 |
| 8-K |
Current report
Officer or director change
|
Sep 16, 2026 | Sep 16, 2026 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Sep 11, 2026 | Sep 10, 2026 |
| 8-K |
Current report
Other events
|
Sep 9, 2026 | Sep 9, 2026 |
| D | Filing | Sep 4, 2026 | — |
| PRE 14A | Preliminary proxy statement | Sep 3, 2026 | Sep 3, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Sep 3, 2026 | Sep 3, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Aug 26, 2026 | Aug 24, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Bylaw or fiscal year change, Regulation FD disclosure
|
Aug 21, 2026 | Aug 20, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2026 | Aug 13, 2026 |
| 10-Q | Quarterly report | Aug 13, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Material agreement, Agreement ended, Results of operations, Regulation FD disclosure, Other events
|
Jul 27, 2026 | Jul 23, 2026 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change, Shareholder vote results
|
Jul 15, 2026 | Jul 14, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 1, 2026 | Jul 1, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 17, 2026 | Jun 17, 2026 |
| DEF 14A | Proxy statement | Jun 9, 2026 | Jul 14, 2026 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt, Unregistered share sale, Regulation FD disclosure
|
Jun 5, 2026 | Jun 3, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 5, 2026 | Jun 4, 2026 |
| 8-K |
Current report
Other events
|
Jun 2, 2026 | Jun 2, 2026 |
| PRE 14A | Preliminary proxy statement | May 18, 2026 | May 18, 2026 |
| DEFA14A | Additional proxy material | May 18, 2026 | — |
| 8-K |
Current report
Material agreement, Results of operations, Officer or director change, Regulation FD disclosure, Other events
|
May 18, 2026 | May 18, 2026 |
| 10-Q | Quarterly report | May 15, 2026 | Mar 31, 2026 |
| ARS | Annual report to shareholders | Apr 24, 2026 | Apr 24, 2026 |
| DEFA14A | Additional proxy material | Apr 24, 2026 | — |
| DEF 14A | Proxy statement | Apr 24, 2026 | Apr 24, 2026 |
| 8-K |
Current report
Listing notice
|
Apr 9, 2026 | Apr 8, 2026 |
| EFFECT | Filing | Mar 18, 2026 | — |
| POS AM | Filing | Mar 17, 2026 | — |
| 8-K |
Current report
Results of operations
|
Mar 17, 2026 | Mar 17, 2026 |
| 10-K | Annual report | Mar 17, 2026 | Dec 31, 2025 |
| POSASR | Filing | Mar 17, 2026 | — |
| 8-K |
Current report
Other events
|
Feb 23, 2026 | Feb 23, 2026 |
| S-3ASR | Automatic shelf registration | Jan 28, 2026 | — |
| 8-K |
Current report
Results of operations
|
Nov 5, 2025 | Nov 5, 2025 |
| 10-Q | Quarterly report | Nov 5, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Unregistered share sale
|
Sep 25, 2025 | Sep 24, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 5, 2025 | Aug 5, 2025 |
| 10-Q | Quarterly report | Aug 5, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 25, 2025 | Jun 25, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 16, 2025 | Jun 16, 2025 |
| 8-K |
Current report
Results of operations
|
May 15, 2025 | May 15, 2025 |
| 10-Q | Quarterly report | May 15, 2025 | Mar 31, 2025 |
| ARS | Annual report to shareholders | Apr 29, 2025 | Apr 28, 2025 |
| DEFA14A | Additional proxy material | Apr 29, 2025 | — |
| DEF 14A | Proxy statement | Apr 29, 2025 | Apr 28, 2025 |
| S-8 | Employee stock plan registration | Mar 13, 2025 | — |
| 8-K |
Current report
Results of operations
|
Mar 13, 2025 | Mar 13, 2025 |
| 10-K | Annual report | Mar 13, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Other events
|
Feb 19, 2025 | Feb 19, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2024 | Nov 7, 2024 |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Listing notice
|
Sep 13, 2024 | Sep 11, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2024 | Aug 12, 2024 |
| 10-Q | Quarterly report | Aug 12, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Other events
|
Jul 18, 2024 | Jul 18, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2024 | Jun 6, 2024 |
| 8-K |
Current report
Listing notice
|
May 24, 2024 | May 22, 2024 |
| 8-K |
Current report
Results of operations
|
May 7, 2024 | May 7, 2024 |
| 10-Q | Quarterly report | May 7, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Material agreement, Agreement ended, Unregistered share sale, Other events
|
May 6, 2024 | May 3, 2024 |
| ARS | Annual report to shareholders | Apr 26, 2024 | Apr 26, 2024 |
| DEFA14A | Additional proxy material | Apr 24, 2024 | — |
| DEF 14A | Proxy statement | Apr 24, 2024 | Apr 16, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 12, 2024 | Mar 11, 2024 |
| S-8 | Employee stock plan registration | Mar 5, 2024 | — |
| 10-K | Annual report | Mar 5, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 5, 2024 | Mar 5, 2024 |
| 8-K |
Current report
Other events
|
Mar 4, 2024 | Mar 4, 2024 |
| 8-K |
Current report
Officer or director change
|
Nov 29, 2023 | Nov 28, 2023 |
| 8-K |
Current report
Officer or director change, Bylaw or fiscal year change
|
Nov 27, 2023 | Nov 20, 2023 |
| 10-Q | Quarterly report | Nov 9, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2023 | Nov 9, 2023 |
| 8-K |
Current report
Listing notice
|
Oct 20, 2023 | Oct 19, 2023 |
| 8-K |
Current report
Officer or director change
|
Sep 7, 2023 | Sep 6, 2023 |
| EFFECT | Filing | Aug 28, 2023 | — |
| 424B3 | Prospectus | Aug 28, 2023 | — |
| UPLOAD | Letter from the SEC | Aug 24, 2023 | — |
| CORRESP | Letter to the SEC | Aug 24, 2023 | — |
| DEL AM | Filing | Aug 21, 2023 | — |
| S-3 | Shelf registration | Aug 18, 2023 | — |
| RW | Filing | Aug 18, 2023 | — |
| S-3ASR | Automatic shelf registration | Aug 17, 2023 | — |
| 10-Q | Quarterly report | Aug 8, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2023 | Aug 8, 2023 |
| D | Filing | Aug 7, 2023 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Jul 20, 2023 | Jul 19, 2023 |
| 8-K |
Current report
Other events
|
Jul 20, 2023 | Jul 20, 2023 |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 9, 2023 | Jun 8, 2023 |
| DEFA14A | Additional proxy material | May 9, 2023 | — |
| 8-K |
Current report
Results of operations
|
May 9, 2023 | May 9, 2023 |
| 10-Q | Quarterly report | May 9, 2023 | Mar 31, 2023 |
| ARS | Annual report to shareholders | Apr 28, 2023 | Apr 28, 2023 |
| DEFA14A | Additional proxy material | Apr 28, 2023 | — |
| DEF 14A | Proxy statement | Apr 28, 2023 | — |
| PRE 14A | Preliminary proxy statement | Apr 17, 2023 | — |
| 8-K |
Current report
Other events
|
Apr 3, 2023 | Apr 3, 2023 |
| 10-K | Annual report | Mar 17, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Mar 17, 2023 | Mar 17, 2023 |
| 8-K |
Current report
Other events
|
Dec 6, 2022 | Dec 6, 2022 |
| 10-Q | Quarterly report | Nov 3, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2022 | Nov 3, 2022 |
| S-3ASR | Automatic shelf registration | Aug 9, 2022 | — |
| 10-Q | Quarterly report | Aug 9, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2022 | Aug 9, 2022 |
| D | Filing | Jul 18, 2022 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure
|
Jul 13, 2022 | Jul 13, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 10, 2022 | Jun 9, 2022 |
| 10-Q | Quarterly report | May 10, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 10, 2022 | May 10, 2022 |
| DEFA14A | Additional proxy material | Apr 27, 2022 | — |
| DEF 14A | Proxy statement | Apr 27, 2022 | Jun 9, 2022 |
| 8-K |
Current report
Results of operations, Other events
|
Apr 25, 2022 | Apr 25, 2022 |
| S-8 | Employee stock plan registration | Mar 3, 2022 | — |
| S-3ASR | Automatic shelf registration | Mar 3, 2022 | — |
| 10-K | Annual report | Mar 3, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Mar 3, 2022 | Mar 3, 2022 |
| 10-Q | Quarterly report | Nov 8, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2021 | Nov 8, 2021 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Oct 12, 2021 | Oct 11, 2021 |
| 8-K |
Current report
Officer or director change
|
Sep 21, 2021 | Sep 16, 2021 |
| 10-Q | Quarterly report | Aug 9, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2021 | Aug 9, 2021 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 14, 2021 | Jun 9, 2021 |
| 10-Q | Quarterly report | May 6, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations
|
May 6, 2021 | May 6, 2021 |
| DEFA14A | Additional proxy material | Apr 27, 2021 | — |
| DEF 14A | Proxy statement | Apr 27, 2021 | Jun 9, 2021 |
| 8-K |
Current report
Officer or director change
|
Apr 20, 2021 | Apr 17, 2021 |
| 10-K | Annual report | Feb 26, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations
|
Feb 25, 2021 | Feb 25, 2021 |
| 8-K |
Current report
Officer or director change
|
Nov 17, 2020 | Nov 16, 2020 |
| 10-Q | Quarterly report | Nov 10, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2020 | Nov 10, 2020 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Oct 13, 2020 | Oct 13, 2020 |
| 10-Q | Quarterly report | Aug 11, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2020 | Aug 11, 2020 |
| 8-K |
Current report
Material agreement, New debt
|
Jul 2, 2020 | Jul 2, 2020 |
| 8-K |
Current report
Shareholder vote results
|
Jun 18, 2020 | Jun 17, 2020 |
| 8-K |
Current report
Material agreement, New debt, Other events
|
May 21, 2020 | May 18, 2020 |
| 424B5 | Prospectus supplement | May 19, 2020 | — |
| 424B5 | Prospectus supplement | May 19, 2020 | — |
| FWP | Free writing prospectus | May 19, 2020 | — |
| FWP | Free writing prospectus | May 18, 2020 | — |
| 305B2 | Filing | May 18, 2020 | — |
| 424B5 | Prospectus supplement | May 18, 2020 | — |
| 424B5 | Prospectus supplement | May 18, 2020 | — |
| 10-Q | Quarterly report | May 12, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations
|
May 12, 2020 | May 12, 2020 |
| DEFA14A | Additional proxy material | Apr 27, 2020 | — |
| DEF 14A | Proxy statement | Apr 27, 2020 | Jun 17, 2020 |
| S-3ASR | Automatic shelf registration | Apr 10, 2020 | — |
| 10-K | Annual report | Mar 24, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations
|
Mar 24, 2020 | Mar 24, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 13, 2020 | Jan 13, 2020 |
| 10-Q | Quarterly report | Nov 12, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2019 | Nov 12, 2019 |
| 8-K |
Current report
Officer or director change
|
Sep 13, 2019 | Sep 12, 2019 |
| 10-Q | Quarterly report | Aug 8, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2019 | Aug 8, 2019 |
| 8-K |
Current report
Shareholder vote results
|
Jun 11, 2019 | Jun 10, 2019 |
| 8-K |
Current report
Officer or director change
|
May 30, 2019 | May 30, 2019 |
| 10-Q | Quarterly report | May 14, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 14, 2019 | May 14, 2019 |
| 8-K |
Current report
Material agreement, New debt
|
May 3, 2019 | May 2, 2019 |
| DEFA14A | Additional proxy material | Apr 30, 2019 | — |
| DEF 14A | Proxy statement | Apr 30, 2019 | Jun 10, 2019 |
| 10-K | Annual report | Mar 22, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations
|
Mar 22, 2019 | Mar 22, 2019 |
| 8-K |
Current report
Officer or director change
|
Mar 11, 2019 | Mar 7, 2019 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Feb 12, 2019 | Feb 12, 2019 |
| S-8 | Employee stock plan registration | Feb 8, 2019 | — |
| 424B4 | Prospectus | Feb 8, 2019 | — |
| CT ORDER | Filing | Feb 8, 2019 | — |
| EFFECT | Filing | Feb 7, 2019 | — |
| S-1MEF | Filing | Feb 7, 2019 | — |
| CORRESP | Letter to the SEC | Feb 5, 2019 | — |
| CORRESP | Letter to the SEC | Feb 5, 2019 | — |
| CERT | Filing | Feb 5, 2019 | — |
| 8-A12B | Filing | Feb 4, 2019 | — |
| FWP | Free writing prospectus | Jan 30, 2019 | — |
| S-1/A | Amended registration statement | Jan 30, 2019 | — |
| FWP | Free writing prospectus | Jan 24, 2019 | — |
| S-1/A | Amended registration statement | Jan 23, 2019 | — |
| CORRESP | Letter to the SEC | Dec 26, 2018 | — |
| CORRESP | Letter to the SEC | Dec 21, 2018 | — |
| S-1 | Registration statement | Dec 21, 2018 | — |
| UPLOAD | Letter from the SEC | Dec 14, 2018 | — |
| DRSLTR | Filing | Nov 29, 2018 | — |
| DRS/A | Filing | Nov 29, 2018 | — |
| UPLOAD | Letter from the SEC | Nov 9, 2018 | — |
| DRS | Filing | Oct 11, 2018 | — |
| D | Filing | Aug 1, 2018 | — |
| D | Filing | Jan 19, 2018 | — |
| D | Filing | Jan 19, 2018 | — |
Showing 198 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- GOSS (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- San Diego, CA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1728117
Other Pharmaceutical Preparations companies
- ELI LILLY & Co LLY
- Johnson & Johnson JNJ
- AbbVie Inc. ABBV
- Merck & Co., Inc. MRK
- Novartis AG NVS
- Astrazeneca PLC AZN
- Abbott Laboratories ABT
- Novo Nordisk A S NVO
Source: SEC EDGAR filings. This is company-reported data, not investment advice.