Tenax Therapeutics, Inc. SEC filings TENX
Tenax Therapeutics, Inc. has 995 filings in SEC EDGAR's recent list, going back to Aug 2, 1996. Its latest annual report, Form ARS, was filed on Apr 22, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 5, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 5, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 27, 2026 | — |
| 4 | Insider transaction | Oct 21, 2026 | Oct 19, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 9, 2026 | — |
| 4 | Insider transaction | Sep 17, 2026 | Sep 16, 2026 |
| 4 | Insider transaction | Sep 15, 2026 | Sep 11, 2026 |
| 4 | Insider transaction | Sep 15, 2026 | Sep 11, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 11, 2026 | — |
| 4 | Insider transaction | Sep 8, 2026 | Sep 3, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 8, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 8, 2026 | — |
| 4 | Insider transaction | Sep 2, 2026 | Aug 31, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 27, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 27, 2026 | — |
| 4 | Insider transaction | Aug 24, 2026 | Aug 20, 2026 |
| 3 | Initial insider ownership | Aug 24, 2026 | Aug 20, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 18, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 12, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jul 31, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 30, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jul 17, 2026 | — |
| 4 | Insider transaction | Jul 14, 2026 | Jul 13, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 8, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jun 5, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 20, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 4 | Insider transaction | May 13, 2026 | May 11, 2026 |
| 3 | Initial insider ownership | May 13, 2026 | May 11, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 8, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 7, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 7, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 4, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 8, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 7, 2026 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Mar 10, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 9, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2026 | — |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| 4 | Insider transaction | Jan 13, 2026 | Jan 9, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 23, 2025 | — |
| 4 | Insider transaction | Dec 10, 2025 | Dec 8, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 8, 2025 | — |
| 4 | Insider transaction | Dec 5, 2025 | Dec 2, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Dec 5, 2025 | — |
| 4 | Insider transaction | Nov 20, 2025 | Nov 18, 2025 |
| 4/A | Primary document | Nov 20, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 5, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 29, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 7, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 2, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| 4 | Insider transaction | Jul 3, 2025 | Jul 1, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 30, 2025 | — |
| 4 | Insider transaction | May 20, 2025 | May 16, 2025 |
| 4 | Insider transaction | May 20, 2025 | May 16, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 4, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 18, 2025 | — |
| 4 | Insider transaction | Mar 12, 2025 | Mar 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 15, 2025 | — |
| 3 | Initial insider ownership | Jan 10, 2025 | Jan 8, 2025 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 4 | Insider transaction | Dec 12, 2024 | Dec 10, 2024 |
| 3 | Initial insider ownership | Dec 6, 2024 | Dec 2, 2024 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 5, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 13, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Sep 10, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 19, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 19, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 15, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Aug 14, 2024 | — |
| 4 | Insider transaction | Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | May 21, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 21, 2024 | May 17, 2024 |
| SC 13G | Ownership over 5% (passive) | Feb 20, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 16, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 15, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| 3 | Initial insider ownership | Jan 12, 2024 | Jan 11, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2023 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 9, 2023 | — |
| SC 13D/A | Amended ownership over 5% (active) | Feb 9, 2023 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 6, 2023 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jan 6, 2023 | — |
| SC 13D/A | Amended ownership over 5% (active) | Sep 23, 2022 | — |
| 4 | Insider transaction | Sep 23, 2022 | Sep 21, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 12, 2022 | — |
| 4 | Insider transaction | Aug 12, 2022 | Aug 11, 2022 |
| SC 13G | Ownership over 5% (passive) | Jun 21, 2022 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jun 17, 2022 | — |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| 4 | Insider transaction | Jun 10, 2022 | Jun 9, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | May 20, 2022 | — |
| 4 | Insider transaction | May 19, 2022 | May 18, 2022 |
| 3 | Initial insider ownership | Apr 12, 2022 | Feb 25, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 4, 2022 | — |
| 3 | Initial insider ownership | Jan 31, 2022 | Jan 28, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Dec 6, 2021 | — |
| 4 | Insider transaction | Dec 6, 2021 | Oct 12, 2021 |
| 3 | Initial insider ownership | Nov 4, 2021 | Oct 29, 2021 |
| SC 13D/A | Amended ownership over 5% (active) | Aug 24, 2021 | — |
| 4 | Insider transaction | Aug 11, 2021 | Jun 30, 2021 |
| 3 | Initial insider ownership | Jul 15, 2021 | Jul 14, 2021 |
| 4 | Insider transaction | Jul 9, 2021 | Jul 8, 2021 |
| SC 13D/A | Amended ownership over 5% (active) | Jul 9, 2021 | — |
| 4 | Insider transaction | Jul 8, 2021 | Jul 6, 2021 |
| SC 13D | Ownership over 5% (active) | Jun 22, 2021 | — |
| SC 13D | Ownership over 5% (active) | Jun 22, 2021 | — |
| 4 | Insider transaction | Jun 15, 2021 | Jun 10, 2021 |
| 4 | Insider transaction | Jun 15, 2021 | Jun 10, 2021 |
| 4 | Insider transaction | Jun 15, 2021 | Jun 11, 2021 |
| 4 | Insider transaction | Jun 15, 2021 | Jun 10, 2021 |
| 4 | Insider transaction | Jun 15, 2021 | Jun 10, 2021 |
| 4 | Insider transaction | Jun 15, 2021 | Jun 11, 2021 |
| 3 | Initial insider ownership | Jun 15, 2021 | Feb 25, 2021 |
| 3 | Initial insider ownership | Jun 15, 2021 | Feb 25, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2021 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2021 | — |
| 4 | Insider transaction | Jan 27, 2021 | Jan 15, 2021 |
| 3 | Initial insider ownership | Jan 27, 2021 | Jan 15, 2021 |
| 4 | Insider transaction | Jan 12, 2021 | Jan 5, 2021 |
| 4 | Insider transaction | Jan 12, 2021 | Jan 5, 2021 |
| 4 | Insider transaction | Sep 9, 2020 | Sep 4, 2020 |
| 4 | Insider transaction | Sep 3, 2020 | Sep 1, 2020 |
| 4 | Insider transaction | Aug 31, 2020 | Aug 27, 2020 |
| 4 | Insider transaction | Aug 26, 2020 | Aug 24, 2020 |
| 4 | Insider transaction | Aug 21, 2020 | Aug 19, 2020 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 7, 2020 | — |
| 3 | Initial insider ownership | Jul 21, 2020 | Jul 20, 2020 |
| 3 | Initial insider ownership | Jul 16, 2020 | Jul 6, 2020 |
| SC 13D | Ownership over 5% (active) | Jul 16, 2020 | — |
| 4 | Insider transaction | Jun 15, 2020 | May 1, 2019 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 2, 2020 | — |
| 4 | Insider transaction | May 19, 2020 | May 18, 2020 |
| SC 13D | Ownership over 5% (active) | May 18, 2020 | — |
| 4 | Insider transaction | May 15, 2020 | Mar 1, 2020 |
| 4 | Insider transaction | May 15, 2020 | May 1, 2020 |
| 4 | Insider transaction | May 15, 2020 | May 1, 2020 |
| 4 | Insider transaction | May 15, 2020 | May 1, 2020 |
| 4 | Insider transaction | May 15, 2020 | Mar 1, 2020 |
| SC 13G | Ownership over 5% (passive) | Mar 23, 2020 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2020 | — |
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.
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
- TENX (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Chapel Hill, NC
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 34956
- Former names
- OXYGEN BIOTHERAPEUTICS, INC. (until Sep 15, 2014); SYNTHETIC BLOOD INTERNATIONAL INC (until Jun 30, 2008)
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.