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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2026 | Nov 5, 2026 |
| 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 | — |
| 8-K |
Current report
Other events
|
Oct 8, 2026 | Oct 8, 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 | — |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 9, 2026 | Sep 9, 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 | — |
| 8-K |
Current report
Other events
|
Aug 10, 2026 | Aug 10, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jul 31, 2026 | — |
| 10-Q | Quarterly report | Jul 31, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2026 | 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 | — |
| 8-K |
Current report
Other events
|
Jul 2, 2026 | Jul 2, 2026 |
| 8-K |
Current report
Material agreement
|
Jun 30, 2026 | Jun 29, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Jun 29, 2026 | Jun 26, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jun 5, 2026 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 4, 2026 | Jun 2, 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 |
| S-8 | Employee stock plan registration | May 12, 2026 | — |
| 10-Q | Quarterly report | May 12, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 12, 2026 | May 12, 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 | — |
| ARS | Annual report to shareholders | Apr 22, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 22, 2026 | — |
| DEF 14A | Proxy statement | Apr 22, 2026 | Apr 17, 2026 |
| 8-K |
Current report
Officer or director change, Other events
|
Apr 22, 2026 | Apr 22, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 8, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 7, 2026 | — |
| EFFECT | Filing | Apr 1, 2026 | — |
| CORRESP | Letter to the SEC | Mar 31, 2026 | — |
| UPLOAD | Letter from the SEC | Mar 27, 2026 | — |
| S-3 | Shelf registration | Mar 24, 2026 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Mar 10, 2026 | — |
| 10-K | Annual report | Mar 10, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 10, 2026 | 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 |
| 8-K |
Current report
Officer or director change
|
Jan 9, 2026 | Jan 6, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 23, 2025 | — |
| 8-K |
Current report
Other events
|
Dec 17, 2025 | Dec 17, 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 | — |
| 10-Q | Quarterly report | Nov 12, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2025 | Nov 12, 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 | — |
| 8-K |
Current report
Other events
|
Sep 16, 2025 | Sep 16, 2025 |
| 8-K |
Current report
Material agreement
|
Sep 9, 2025 | Sep 3, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 13, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2025 | Aug 13, 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 | — |
| 8-K |
Current report
Bylaw or fiscal year change, Shareholder vote results
|
Jun 17, 2025 | Jun 11, 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 | — |
| 10-Q | Quarterly report | May 14, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 14, 2025 | May 14, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 14, 2025 | — |
| ARS | Annual report to shareholders | Apr 25, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 25, 2025 | — |
| DEF 14A | Proxy statement | Apr 25, 2025 | Apr 24, 2025 |
| EFFECT | Filing | Apr 23, 2025 | — |
| 424B3 | Prospectus | Apr 23, 2025 | — |
| CORRESP | Letter to the SEC | Apr 21, 2025 | — |
| UPLOAD | Letter from the SEC | Apr 18, 2025 | — |
| S-3 | Shelf registration | Apr 15, 2025 | — |
| PRE 14A | Preliminary proxy statement | Apr 9, 2025 | Apr 9, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 4, 2025 | — |
| 10-K | Annual report | Mar 25, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 25, 2025 | Mar 25, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 18, 2025 | — |
| 4 | Insider transaction | Mar 12, 2025 | Mar 5, 2025 |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Mar 6, 2025 | Mar 4, 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 | — |
| 8-K |
Current report
Officer or director change
|
Dec 4, 2024 | Dec 2, 2024 |
| S-8 | Employee stock plan registration | Nov 26, 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 | — |
| 10-Q | Quarterly report | Nov 13, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2024 | Nov 13, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Oct 30, 2024 | Oct 25, 2024 |
| DEF 14A | Proxy statement | Sep 27, 2024 | Oct 25, 2024 |
| EFFECT | Filing | Sep 12, 2024 | — |
| 424B3 | Prospectus | Sep 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Sep 10, 2024 | — |
| CORRESP | Letter to the SEC | Sep 10, 2024 | — |
| UPLOAD | Letter from the SEC | Sep 5, 2024 | — |
| S-8 | Employee stock plan registration | Aug 30, 2024 | — |
| S-3 | Shelf registration | Aug 30, 2024 | — |
| D | Filing | Aug 23, 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 | — |
| 10-Q | Quarterly report | Aug 13, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2024 | Aug 13, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 12, 2024 | Aug 12, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 8, 2024 | Aug 8, 2024 |
| 8-K | Current report | Aug 6, 2024 | Aug 6, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 13, 2024 | Jun 7, 2024 |
| DEFA14A | Additional proxy material | May 24, 2024 | — |
| 4 | Insider transaction | May 21, 2024 | May 17, 2024 |
| 4 | Insider transaction | May 21, 2024 | May 17, 2024 |
| 10-Q | Quarterly report | May 14, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 14, 2024 | May 14, 2024 |
| ARS | Annual report to shareholders | Apr 26, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 26, 2024 | — |
| DEF 14A | Proxy statement | Apr 26, 2024 | Jun 7, 2024 |
| EFFECT | Filing | Apr 12, 2024 | — |
| EFFECT | Filing | Apr 12, 2024 | — |
| POS AM | Form pos am | Apr 11, 2024 | — |
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
- 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)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.