GT Biopharma, Inc. SEC filings GTBP
GT Biopharma, Inc. has 883 filings in SEC EDGAR's recent list, going back to May 12, 1995. Its latest annual report, Form 10-K, was filed on Mar 2, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 14, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Sep 25, 2026 (other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| EFFECT | Filing | Oct 20, 2026 | — |
| 424B3 | Prospectus | Oct 20, 2026 | — |
| DEF 14A | Proxy statement | Oct 13, 2026 | Oct 13, 2026 |
| S-1 | Registration statement | Oct 9, 2026 | — |
| PRE 14A | Preliminary proxy statement | Oct 2, 2026 | Oct 2, 2026 |
| D | Filing | Sep 29, 2026 | — |
| 8-K |
Current report
Other events
|
Sep 25, 2026 | Sep 22, 2026 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Change to shareholder rights, Bylaw or fiscal year change
|
Sep 21, 2026 | Sep 18, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 15, 2026 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Change to shareholder rights, Bylaw or fiscal year change
|
Sep 15, 2026 | Sep 14, 2026 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Sep 3, 2026 | Sep 2, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Aug 14, 2026 | Aug 14, 2026 |
| 10-Q | Quarterly report | Aug 14, 2026 | Jun 30, 2026 |
| DEF 14A | Proxy statement | Jul 2, 2026 | Jul 2, 2026 |
| PRE 14A | Preliminary proxy statement | Jun 18, 2026 | Jun 18, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Jun 12, 2026 | Jun 8, 2026 |
| 8-K |
Current report
Listing notice
|
May 22, 2026 | May 20, 2026 |
| 10-Q | Quarterly report | May 15, 2026 | Mar 31, 2026 |
| EFFECT | Filing | May 13, 2026 | — |
| 424B3 | Prospectus | May 13, 2026 | — |
| CORRESP | Letter to the SEC | May 11, 2026 | — |
| UPLOAD | Letter from the SEC | May 6, 2026 | — |
| S-1 | Registration statement | Apr 30, 2026 | — |
| 8-K |
Current report
Material agreement
|
Apr 7, 2026 | Apr 3, 2026 |
| 10-Q/A | Amended quarterly report | Mar 6, 2026 | Jun 30, 2025 |
| 10-Q/A | Amended quarterly report | Mar 6, 2026 | Sep 30, 2025 |
| 10-K | Annual report | Mar 2, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Restatement
|
Mar 2, 2026 | Mar 1, 2026 |
| EFFECT | Filing | Jan 30, 2026 | — |
| 424B3 | Prospectus | Jan 30, 2026 | — |
| CORRESP | Letter to the SEC | Jan 28, 2026 | — |
| UPLOAD | Letter from the SEC | Jan 27, 2026 | — |
| S-1 | Registration statement | Jan 21, 2026 | — |
| 424B3 | Prospectus | Jan 8, 2026 | — |
| EFFECT | Filing | Dec 2, 2025 | — |
| 424B3 | Prospectus | Dec 2, 2025 | — |
| CORRESP | Letter to the SEC | Dec 2, 2025 | — |
| 8-K |
Current report
Listing notice
|
Nov 26, 2025 | Nov 20, 2025 |
| 10-Q | Quarterly report | Nov 14, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 14, 2025 | Nov 14, 2025 |
| S-1 | Registration statement | Oct 24, 2025 | — |
| 8-K |
Current report
Change to shareholder rights
|
Sep 26, 2025 | Sep 25, 2025 |
| 8-K |
Current report
Change to shareholder rights
|
Sep 23, 2025 | Sep 17, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 4, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 4, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 4, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 4, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 4, 2025 |
| 8-K |
Current report
Officer or director change
|
Aug 29, 2025 | Aug 26, 2025 |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
| 3 | Initial insider ownership | Jul 30, 2025 | Jun 10, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jul 24, 2025 | Jul 24, 2025 |
| 424B3 | Prospectus | Jul 3, 2025 | — |
| EFFECT | Filing | Jul 2, 2025 | — |
| CORRESP | Letter to the SEC | Jul 1, 2025 | — |
| S-1/A | Amended registration statement | Jun 27, 2025 | — |
| CORRESP | Letter to the SEC | Jun 27, 2025 | — |
| UPLOAD | Letter from the SEC | Jun 20, 2025 | — |
| S-1 | Registration statement | Jun 11, 2025 | — |
| DEFA14A | Additional proxy material | Jun 11, 2025 | — |
| DEF 14A | Proxy statement | Jun 11, 2025 | Jun 11, 2025 |
| 8-K |
Current report
Material agreement, Officer or director change
|
Jun 11, 2025 | Jun 10, 2025 |
| 3 | Initial insider ownership | Jun 3, 2025 | May 7, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jun 2, 2025 | — |
| PRE 14A | Preliminary proxy statement | May 30, 2025 | May 30, 2025 |
| 3 | Initial insider ownership | May 29, 2025 | May 8, 2025 |
| D | Filing | May 28, 2025 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Change to shareholder rights, Bylaw or fiscal year change
|
May 27, 2025 | May 21, 2025 |
| D | Filing | May 27, 2025 | — |
| 10-Q | Quarterly report | May 15, 2025 | Mar 31, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 14, 2025 | — |
| 8-K |
Current report
Officer or director change
|
May 13, 2025 | May 7, 2025 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Change to shareholder rights, Bylaw or fiscal year change
|
May 13, 2025 | May 12, 2025 |
| 8-K |
Current report
Officer or director change
|
May 5, 2025 | Apr 29, 2025 |
| 10-K/A | Amended annual report | Apr 14, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Unregistered share sale
|
Apr 4, 2025 | Mar 31, 2025 |
| 424B3 | Prospectus | Mar 14, 2025 | — |
| EFFECT | Filing | Mar 13, 2025 | — |
| CORRESP | Letter to the SEC | Mar 11, 2025 | — |
| UPLOAD | Letter from the SEC | Mar 11, 2025 | — |
| D | Filing | Mar 7, 2025 | — |
| S-3 | Shelf registration | Mar 6, 2025 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Feb 26, 2025 | Feb 25, 2025 |
| RW | Filing | Feb 24, 2025 | — |
| 10-K | Annual report | Feb 21, 2025 | Dec 31, 2024 |
| S-1/A | Amended registration statement | Feb 7, 2025 | — |
| S-1/A | Amended registration statement | Jan 27, 2025 | — |
| 8-K |
Current report
Other events
|
Jan 27, 2025 | Jan 27, 2025 |
| S-1 | Registration statement | Dec 23, 2024 | — |
| 8-K |
Current report
Listing notice
|
Nov 27, 2024 | Nov 21, 2024 |
| 8-K |
Current report
Material agreement
|
Nov 21, 2024 | Nov 18, 2024 |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Oct 21, 2024 | Oct 17, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 17, 2024 | — |
| 8-K |
Current report
Officer or director change
|
Sep 16, 2024 | Sep 16, 2024 |
| 10-Q | Quarterly report | Aug 14, 2024 | Jun 30, 2024 |
| 424B3 | Prospectus | Jul 2, 2024 | — |
| EFFECT | Filing | Jun 28, 2024 | — |
| CORRESP | Letter to the SEC | Jun 27, 2024 | — |
| S-1/A | Amended registration statement | Jun 27, 2024 | — |
| 8-K |
Current report
Other events
|
Jun 27, 2024 | Jun 27, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 26, 2024 | Jun 25, 2024 |
| UPLOAD | Letter from the SEC | Jun 24, 2024 | — |
| S-1 | Registration statement | Jun 20, 2024 | — |
| DEFA14A | Additional proxy material | Jun 17, 2024 | — |
| 3 | Initial insider ownership | Jun 13, 2024 | Jun 3, 2024 |
| 8-K |
Current report
Officer or director change
|
Jun 7, 2024 | Jun 3, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | May 23, 2024 | — |
| 424B5 | Prospectus supplement | May 23, 2024 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
May 23, 2024 | May 21, 2024 |
| 10-Q | Quarterly report | May 15, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Material agreement
|
Apr 30, 2024 | Apr 25, 2024 |
| ARS | Annual report to shareholders | Apr 29, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 29, 2024 | — |
| DEF 14A | Proxy statement | Apr 29, 2024 | Apr 29, 2024 |
| 10-K | Annual report | Mar 26, 2024 | Dec 31, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Regulation FD disclosure
|
Feb 1, 2024 | Feb 1, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Dec 21, 2023 | Dec 18, 2023 |
| 8-K |
Current report
Other events
|
Dec 4, 2023 | Dec 4, 2023 |
| DEFA14A | Additional proxy material | Nov 6, 2023 | — |
| DEFA14A | Additional proxy material | Nov 6, 2023 | — |
| DEF 14A | Proxy statement | Nov 6, 2023 | Nov 6, 2023 |
| 10-Q | Quarterly report | Nov 1, 2023 | Sep 30, 2023 |
| PRE 14A | Preliminary proxy statement | Oct 27, 2023 | Oct 27, 2023 |
| SC 13G | Ownership over 5% (passive) | Sep 19, 2023 | — |
| 8-K |
Current report
Listing notice
|
Aug 22, 2023 | Aug 22, 2023 |
| 4 | Insider transaction | Aug 15, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 15, 2023 | Aug 11, 2023 |
| 10-Q | Quarterly report | Aug 7, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jul 5, 2023 | Jun 28, 2023 |
| 4 | Insider transaction | Jun 21, 2023 | Jun 16, 2023 |
| 10-Q | Quarterly report | May 15, 2023 | Mar 31, 2023 |
| DEFA14A | Additional proxy material | May 5, 2023 | — |
| DEFR14A | Filing | May 5, 2023 | — |
| 3 | Initial insider ownership | May 4, 2023 | May 1, 2023 |
| 8-K |
Current report
Officer or director change
|
May 4, 2023 | May 1, 2023 |
| DEF 14A | Proxy statement | May 1, 2023 | May 1, 2023 |
| 4 | Insider transaction | Apr 11, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 10, 2023 | Apr 6, 2023 |
| 10-K | Annual report | Mar 30, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Listing notice
|
Feb 28, 2023 | Feb 22, 2023 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2023 | — |
| 4 | Insider transaction | Feb 1, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 27, 2023 |
| 4 | Insider transaction | Feb 1, 2023 | Jan 27, 2023 |
| 8-K |
Current report
Material agreement, Other events
|
Jan 4, 2023 | Dec 30, 2022 |
| 424B5 | Prospectus supplement | Jan 4, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Dec 13, 2022 | Dec 8, 2022 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Nov 9, 2022 | Nov 3, 2022 |
| 10-Q | Quarterly report | Oct 31, 2022 | Sep 30, 2022 |
| EFFECT | Filing | Oct 20, 2022 | — |
| UPLOAD | Letter from the SEC | Oct 19, 2022 | — |
| CORRESP | Letter to the SEC | Oct 18, 2022 | — |
| S-3 | Shelf registration | Oct 13, 2022 | — |
| 8-K |
Current report
Shareholder vote results
|
Oct 12, 2022 | Oct 10, 2022 |
| DEFA14A | Additional proxy material | Oct 4, 2022 | — |
| 8-K |
Current report
Other events
|
Oct 4, 2022 | Oct 4, 2022 |
| 8-K |
Current report
Material agreement
|
Aug 30, 2022 | Aug 24, 2022 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Aug 17, 2022 | Jun 8, 2022 |
| DEF 14A | Proxy statement | Aug 17, 2022 | Aug 17, 2022 |
| 10-Q | Quarterly report | Aug 15, 2022 | Jun 30, 2022 |
| S-8 | Employee stock plan registration | Jul 25, 2022 | — |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 4 | Insider transaction | Jul 19, 2022 | Jul 15, 2022 |
| 3 | Initial insider ownership | Jun 14, 2022 | Jun 9, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 14, 2022 | Jun 8, 2022 |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2022 | Jun 9, 2022 |
| 10-Q | Quarterly report | May 16, 2022 | Mar 31, 2022 |
| DEF 14A | Proxy statement | Apr 29, 2022 | Apr 29, 2022 |
| PRE 14A | Preliminary proxy statement | Apr 19, 2022 | Apr 19, 2022 |
| 10-K | Annual report | Mar 28, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Officer or director change
|
Mar 8, 2022 | Mar 2, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 3, 2022 | — |
| 3 | Initial insider ownership | Feb 18, 2022 | Feb 14, 2022 |
| 8-K |
Current report
Officer or director change
|
Feb 18, 2022 | Feb 14, 2022 |
| 4 | Insider transaction | Feb 14, 2022 | Feb 16, 2021 |
| 4 | Insider transaction | Feb 14, 2022 | Feb 16, 2021 |
| 4 | Insider transaction | Feb 14, 2022 | Dec 31, 2021 |
| 3 | Initial insider ownership | Feb 14, 2022 | Nov 11, 2020 |
| 3 | Initial insider ownership | Feb 14, 2022 | Nov 28, 2021 |
| 3 | Initial insider ownership | Feb 14, 2022 | Jan 13, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 28, 2022 | — |
| UPLOAD | Letter from the SEC | Jan 26, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 18, 2022 | — |
| CORRESP | Letter to the SEC | Dec 29, 2021 | — |
| 10-Q/A | Amended quarterly report | Dec 29, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Other events
|
Dec 23, 2021 | Dec 22, 2021 |
| 8-K |
Current report
Officer or director change
|
Dec 21, 2021 | Dec 15, 2021 |
| UPLOAD | Letter from the SEC | Dec 15, 2021 | — |
| 8-K |
Current report
Listing notice
|
Nov 26, 2021 | Nov 23, 2021 |
| 4 | Insider transaction | Nov 12, 2021 | Feb 16, 2021 |
| 3 | Initial insider ownership | Nov 12, 2021 | Jan 13, 2021 |
| 10-Q | Quarterly report | Nov 10, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Other events
|
Nov 1, 2021 | Nov 1, 2021 |
Showing 200 filings, the most recent 200. 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.
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Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- GTBP (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- San Francisco, CA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 109657
- Former names
- GT Biopharma, Inc. (until Oct 20, 2026); OXIS INTERNATIONAL INC (until Jul 25, 2017)
Other Pharmaceutical Preparations companies
- ELI LILLY & Co LLY
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- Astrazeneca PLC AZN
- Abbott Laboratories ABT
- Novo Nordisk A S NVO
Source: SEC EDGAR filings. This is company-reported data, not investment advice.