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 |
|---|---|---|---|
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 15, 2026 | — |
| 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 |
| 3 | Initial insider ownership | Jul 30, 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 | — |
| 3 | Initial insider ownership | May 29, 2025 | May 8, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 14, 2025 | — |
| 4 | Insider transaction | Oct 21, 2024 | Oct 17, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 17, 2024 | — |
| 3 | Initial insider ownership | Jun 13, 2024 | Jun 3, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | May 23, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Sep 19, 2023 | — |
| 4 | Insider transaction | Aug 15, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Aug 15, 2023 | Aug 11, 2023 |
| 4 | Insider transaction | Jun 21, 2023 | Jun 16, 2023 |
| 3 | Initial insider ownership | May 4, 2023 | May 1, 2023 |
| 4 | Insider transaction | Apr 11, 2023 | Apr 11, 2023 |
| 4 | Insider transaction | Apr 10, 2023 | Apr 6, 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 |
| 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 |
| SC 13G/A | Amended ownership over 5% (passive) | Mar 3, 2022 | — |
| 3 | Initial insider ownership | 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 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 18, 2022 | — |
| 4 | Insider transaction | Nov 12, 2021 | Feb 16, 2021 |
| 3 | Initial insider ownership | Nov 12, 2021 | Jan 13, 2021 |
| 4 | Insider transaction | Oct 7, 2021 | Nov 16, 2020 |
| 3 | Initial insider ownership | Oct 7, 2021 | Nov 11, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 16, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Feb 17, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2021 | — |
| 4 | Insider transaction | Dec 23, 2020 | Dec 21, 2020 |
| 4 | Insider transaction | Dec 18, 2020 | Dec 16, 2020 |
| 4 | Insider transaction | Dec 15, 2020 | Dec 11, 2020 |
| SC 13G | Ownership over 5% (passive) | Jun 10, 2020 | — |
| 4 | Insider transaction | Jun 4, 2020 | Jun 2, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | May 18, 2020 | — |
| 4 | Insider transaction | May 14, 2020 | May 13, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 4, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 16, 2020 | — |
| 4 | Insider transaction | Aug 16, 2019 | Aug 14, 2019 |
| 4 | Insider transaction | Aug 16, 2019 | Aug 14, 2019 |
| 4 | Insider transaction | Mar 19, 2019 | Feb 1, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2019 | — |
| 4 | Insider transaction | Feb 13, 2019 | Feb 6, 2019 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 12, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2019 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 29, 2019 | — |
| 3 | Initial insider ownership | Mar 16, 2018 | Nov 16, 2017 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 7, 2018 | — |
| SC 13G | Ownership over 5% (passive) | Dec 4, 2017 | — |
| 4 | Insider transaction | Dec 1, 2017 | Sep 1, 2017 |
| 3 | Initial insider ownership | Dec 1, 2017 | Sep 1, 2017 |
| 3 | Initial insider ownership | Dec 1, 2017 | Sep 1, 2017 |
| 4 | Insider transaction | Dec 1, 2017 | Sep 1, 2017 |
| 3 | Initial insider ownership | Dec 1, 2017 | Sep 1, 2017 |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 10, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Sep 20, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2017 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2017 | — |
| 4 | Insider transaction | Apr 5, 2016 | Apr 4, 2016 |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 5, 2016 | — |
| 3 | Initial insider ownership | Mar 2, 2016 | Feb 9, 2016 |
| 3 | Initial insider ownership | Feb 23, 2016 | Jan 25, 2016 |
| SC 13G | Ownership over 5% (passive) | Feb 18, 2016 | — |
| 3 | Initial insider ownership | Feb 12, 2016 | Jan 25, 2016 |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2016 | — |
| SC 13G | Ownership over 5% (passive) | Jan 26, 2016 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 26, 2016 | — |
| 3 | Initial insider ownership | Jan 25, 2016 | Jan 13, 2016 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2016 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2015 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2013 | — |
| 4 | Insider transaction | May 30, 2012 | Mar 1, 2012 |
| 4 | Insider transaction | Sep 1, 2011 | Aug 31, 2011 |
| 3 | Initial insider ownership | Jul 11, 2011 | Jun 30, 2011 |
| 3 | Initial insider ownership | Jul 7, 2011 | Jun 27, 2011 |
| 4 | Insider transaction | May 24, 2011 | May 20, 2011 |
| SC 13D/A | Amended ownership over 5% (active) | Mar 29, 2011 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 15, 2011 | — |
| 3 | Initial insider ownership | Feb 8, 2011 | Jul 1, 2010 |
| 4 | Insider transaction | Jan 19, 2011 | Dec 23, 2010 |
| 4 | Insider transaction | Jan 19, 2011 | Dec 23, 2010 |
| 3/A | Primary document | Jan 19, 2011 | Oct 13, 2009 |
| 3/A | Primary document | Jan 19, 2011 | Oct 13, 2009 |
| 4 | Insider transaction | Sep 2, 2010 | Aug 31, 2010 |
| 4 | Insider transaction | Aug 30, 2010 | Aug 26, 2010 |
| 4 | Insider transaction | Jul 12, 2010 | Jul 7, 2010 |
| 3 | Initial insider ownership | Apr 6, 2010 | Mar 29, 2010 |
| 4 | Insider transaction | Apr 6, 2010 | Jan 19, 2010 |
| 3 | Initial insider ownership | Mar 25, 2010 | Oct 13, 2009 |
| 3 | Initial insider ownership | Mar 25, 2010 | Oct 23, 2009 |
| 3 | Initial insider ownership | Mar 22, 2010 | Mar 11, 2010 |
| 3 | Initial insider ownership | Mar 22, 2010 | Mar 11, 2010 |
| SC 13D | Ownership over 5% (active) | Feb 22, 2010 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 16, 2010 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2009 | — |
| SC 13D/A | Amended ownership over 5% (active) | Oct 6, 2008 | — |
| 5 | Annual insider ownership | Feb 8, 2008 | Dec 31, 2007 |
| 4 | Insider transaction | Nov 13, 2007 | Nov 9, 2007 |
| 4 | Insider transaction | Nov 13, 2007 | Nov 9, 2007 |
| 4 | Insider transaction | Nov 13, 2007 | Nov 9, 2007 |
| 4 | Insider transaction | Nov 13, 2007 | Nov 9, 2007 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2007 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2007 | — |
| 4 | Insider transaction | Jan 19, 2007 | Jan 11, 2007 |
| 3 | Initial insider ownership | Jan 19, 2007 | Jan 11, 2007 |
| 4 | Insider transaction | Nov 8, 2006 | Nov 6, 2006 |
| 4 | Insider transaction | Nov 8, 2006 | Nov 6, 2006 |
| 4 | Insider transaction | Nov 8, 2006 | Nov 6, 2006 |
| 4 | Insider transaction | Nov 8, 2006 | Nov 6, 2006 |
| 4 | Insider transaction | Oct 16, 2006 | Oct 12, 2006 |
| 4 | Insider transaction | Oct 16, 2006 | Oct 12, 2006 |
| 4 | Insider transaction | Oct 16, 2006 | Oct 12, 2006 |
| 4 | Insider transaction | Aug 2, 2006 | Aug 1, 2006 |
| 4 | Insider transaction | Aug 2, 2006 | Aug 1, 2006 |
| 4 | Insider transaction | Aug 2, 2006 | Aug 1, 2006 |
| 4 | Insider transaction | Aug 2, 2006 | Aug 1, 2006 |
| 4 | Insider transaction | Aug 2, 2006 | Aug 1, 2006 |
| 4 | Insider transaction | May 23, 2006 | May 12, 2006 |
| 3 | Initial insider ownership | Mar 23, 2006 | Mar 15, 2006 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2006 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2006 | — |
| 3 | Initial insider ownership | Jan 10, 2006 | Jan 6, 2006 |
| 4 | Insider transaction | Dec 30, 2005 | Dec 28, 2005 |
| 4 | Insider transaction | Dec 30, 2005 | Dec 28, 2005 |
| 4 | Insider transaction | Dec 30, 2005 | Dec 28, 2005 |
| 4 | Insider transaction | Dec 30, 2005 | Dec 28, 2005 |
| 4 | Insider transaction | Dec 30, 2005 | Dec 28, 2005 |
| 4 | Insider transaction | Oct 7, 2005 | Oct 5, 2005 |
| 3 | Initial insider ownership | Oct 7, 2005 | Oct 5, 2005 |
| 4 | Insider transaction | Jun 23, 2005 | Jun 22, 2005 |
| 4 | Insider transaction | Jun 23, 2005 | Jun 22, 2005 |
| 4 | Insider transaction | Jun 23, 2005 | Jun 22, 2005 |
| 4 | Insider transaction | Mar 2, 2005 | Feb 28, 2005 |
| 3 | Initial insider ownership | Mar 2, 2005 | Feb 28, 2005 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2005 | — |
| SC 13G | Ownership over 5% (passive) | Jan 25, 2005 | — |
| SC 13G | Ownership over 5% (passive) | Jan 7, 2005 | — |
| 4 | Insider transaction | Dec 27, 2004 | Dec 24, 2004 |
| 4 | Insider transaction | Oct 13, 2004 | Oct 12, 2004 |
| 4 | Insider transaction | Oct 13, 2004 | Oct 12, 2004 |
| 4 | Insider transaction | Oct 13, 2004 | Oct 12, 2004 |
| 4 | Insider transaction | Oct 13, 2004 | Oct 12, 2004 |
| 4 | Insider transaction | Oct 13, 2004 | Oct 12, 2004 |
| 4 | Insider transaction | Oct 13, 2004 | Oct 12, 2004 |
| 3 | Initial insider ownership | Aug 23, 2004 | Aug 20, 2004 |
| 3 | Initial insider ownership | Jul 23, 2004 | Jun 22, 2004 |
| 4/A | Filing | Jun 30, 2004 | Jun 30, 2004 |
| 4/A | Filing | Jun 30, 2004 | Jun 30, 2004 |
| 4 | Insider transaction | Jun 29, 2004 | Jun 29, 2004 |
| 4 | Insider transaction | Jun 29, 2004 | Jun 29, 2004 |
| 3 | Initial insider ownership | Apr 26, 2004 | Apr 25, 2004 |
| 3 | Initial insider ownership | Apr 26, 2004 | Apr 25, 2004 |
| 3 | Initial insider ownership | Apr 26, 2004 | Apr 25, 2004 |
| 3 | Initial insider ownership | Apr 26, 2004 | Apr 25, 2004 |
| 4/A | Filing | Apr 26, 2004 | Apr 26, 2004 |
| 4/A | Filing | Apr 26, 2004 | Apr 26, 2004 |
| 4/A | Filing | Apr 26, 2004 | Apr 26, 2004 |
| 4 | Insider transaction | Apr 26, 2004 | Apr 26, 2004 |
| 4 | Insider transaction | Apr 26, 2004 | Apr 26, 2004 |
| 4 | Insider transaction | Apr 26, 2004 | Apr 26, 2004 |
| 4 | Insider transaction | Apr 26, 2004 | Apr 26, 2004 |
| SC 13D/A | Amended ownership over 5% (active) | Mar 10, 2004 | — |
| 3 | Initial insider ownership | Jan 20, 2004 | Jan 15, 2004 |
| SC 13D | Ownership over 5% (active) | Jan 16, 2004 | — |
| 4 | Insider transaction | Dec 30, 2003 | Dec 9, 2003 |
| 4 | Insider transaction | Dec 30, 2003 | Dec 9, 2003 |
| 4 | Insider transaction | Dec 11, 2003 | Dec 11, 2003 |
| 4/A | Filing | Dec 11, 2003 | Dec 8, 2003 |
| 4 | Insider transaction | Dec 11, 2003 | Dec 11, 2003 |
| 4 | Insider transaction | Dec 11, 2003 | Dec 11, 2003 |
| 4/A | Filing | Dec 9, 2003 | Dec 9, 2003 |
| 4/A | Filing | Dec 9, 2003 | Dec 9, 2003 |
| 4/A | Filing | Dec 8, 2003 | Dec 8, 2003 |
| 4/A | Filing | Dec 8, 2003 | Dec 8, 2003 |
| 4/A | Filing | Dec 8, 2003 | Dec 8, 2003 |
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)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.