Syndax Pharmaceuticals Inc SEC filings SNDX
Syndax Pharmaceuticals Inc has 657 filings in SEC EDGAR's recent list, going back to Apr 6, 2007. Its latest annual report, Form ARS, was filed on Apr 30, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 2, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 2, 2026 (results of operations, officer or director change). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 2, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Nov 2, 2026 | Nov 2, 2026 |
| 4 | Insider transaction | Oct 30, 2026 | Oct 29, 2026 |
| 144 | Notice of proposed sale | Oct 29, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 7, 2026 | — |
| 10-Q | Quarterly report | Aug 4, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2026 | Aug 4, 2026 |
| 8-K |
Current report
Other events
|
Jul 14, 2026 | Jul 14, 2026 |
| 4 | Insider transaction | Jul 9, 2026 | Jul 8, 2026 |
| 144 | Notice of proposed sale | Jul 8, 2026 | — |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 144 | Notice of proposed sale | Jun 12, 2026 | — |
| 144 | Notice of proposed sale | Jun 11, 2026 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale
|
Jun 10, 2026 | Jun 10, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 10, 2026 | Jun 10, 2026 |
| DEFA14A | Additional proxy material | Jun 4, 2026 | — |
| 8-K |
Current report
Material agreement, New debt, Unregistered share sale, Other events
|
Jun 4, 2026 | Jun 3, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | Jun 1, 2026 |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| 144 | Notice of proposed sale | Jun 1, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| ARS | Annual report to shareholders | Apr 30, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 30, 2026 | — |
| DEF 14A | Proxy statement | Apr 30, 2026 | Apr 30, 2026 |
| 10-Q | Quarterly report | Apr 30, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 30, 2026 | Apr 30, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| S-8 | Employee stock plan registration | Feb 26, 2026 | — |
| 10-K | Annual report | Feb 26, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 26, 2026 | Feb 26, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 9, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 9, 2026 |
| 144 | Notice of proposed sale | Feb 9, 2026 | — |
| 144 | Notice of proposed sale | Feb 9, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 9, 2026 | — |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 4 | Insider transaction | Feb 6, 2026 | Feb 4, 2026 |
| 144 | Notice of proposed sale | Feb 6, 2026 | — |
| 144 | Notice of proposed sale | Feb 6, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2026 | — |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jan 12, 2026 | Jan 12, 2026 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Dec 19, 2025 | Dec 18, 2025 |
| 4 | Insider transaction | Dec 1, 2025 | Dec 1, 2025 |
| 10-Q | Quarterly report | Nov 3, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 3, 2025 | Nov 3, 2025 |
| 8-K |
Current report
Other events
|
Oct 24, 2025 | Oct 24, 2025 |
| 4 | Insider transaction | Sep 8, 2025 | Sep 8, 2025 |
| 144 | Notice of proposed sale | Sep 8, 2025 | — |
| 4 | Insider transaction | Aug 18, 2025 | Aug 14, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 18, 2025 | — |
| 144 | Notice of proposed sale | Aug 18, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 144 | Notice of proposed sale | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| 4 | Insider transaction | Aug 7, 2025 | Jul 31, 2025 |
| 10-Q | Quarterly report | Aug 4, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 4, 2025 | Aug 4, 2025 |
| 4 | Insider transaction | Jul 18, 2025 | Jul 16, 2025 |
| 4 | Insider transaction | Jul 18, 2025 | Jul 16, 2025 |
| 144 | Notice of proposed sale | Jul 16, 2025 | — |
| 144 | Notice of proposed sale | Jul 16, 2025 | — |
| 144 | Notice of proposed sale | Jul 10, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Jun 26, 2025 | Jun 24, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 16, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 19, 2025 |
| 4 | Insider transaction | May 19, 2025 | May 19, 2025 |
| 3 | Initial insider ownership | May 16, 2025 | May 12, 2025 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
May 16, 2025 | May 12, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 9, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 7, 2025 | — |
| 10-Q | Quarterly report | May 5, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
May 5, 2025 | May 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| ARS | Annual report to shareholders | Apr 1, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 1, 2025 | — |
| DEF 14A | Proxy statement | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Mar 17, 2025 | Mar 14, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 7, 2025 | — |
| 4 | Insider transaction | Mar 6, 2025 | Mar 4, 2025 |
| 144 | Notice of proposed sale | Mar 4, 2025 | — |
| S-8 | Employee stock plan registration | Mar 4, 2025 | — |
| 10-K | Annual report | Mar 3, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations, Other events
|
Mar 3, 2025 | Mar 3, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 4 | Insider transaction | Feb 12, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 12, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 12, 2025 | Feb 10, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 12, 2025 | — |
| 144 | Notice of proposed sale | Feb 10, 2025 | — |
| 144 | Notice of proposed sale | Feb 10, 2025 | — |
| 144 | Notice of proposed sale | Feb 10, 2025 | — |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| 4 | Insider transaction | Feb 7, 2025 | Feb 5, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 5, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jan 22, 2025 | — |
| 8-K |
Current report
Officer or director change
|
Dec 20, 2024 | Dec 20, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Dec 6, 2024 | — |
| 8-K |
Current report
Other events
|
Nov 18, 2024 | Nov 15, 2024 |
| 8-K |
Current report
Other events
|
Nov 12, 2024 | Nov 12, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 8, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 8, 2024 | — |
| 10-Q | Quarterly report | Nov 5, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2024 | Nov 5, 2024 |
| 8-K |
Current report
Material agreement
|
Nov 4, 2024 | Nov 4, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 21, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 18, 2024 | — |
| 10-Q | Quarterly report | Aug 1, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 1, 2024 | Aug 1, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | May 16, 2024 | May 15, 2024 |
| 3 | Initial insider ownership | May 16, 2024 | May 15, 2024 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Regulation FD disclosure
|
May 15, 2024 | May 14, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| ARS | Annual report to shareholders | Apr 2, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 2, 2024 | — |
| DEF 14A | Proxy statement | Apr 2, 2024 | Mar 27, 2024 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Mar 18, 2024 | Mar 15, 2024 |
| S-3ASR | Automatic shelf registration | Feb 27, 2024 | — |
| S-8 | Employee stock plan registration | Feb 27, 2024 | — |
| 10-K | Annual report | Feb 27, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 27, 2024 | Feb 27, 2024 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 13, 2024 | — |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| 4 | Insider transaction | Feb 9, 2024 | Feb 7, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 8, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2024 | — |
| 8-K |
Current report
Other events
|
Dec 20, 2023 | Dec 19, 2023 |
| 8-K |
Current report
Material agreement
|
Dec 15, 2023 | Dec 14, 2023 |
| 424B5 | Prospectus supplement | Dec 15, 2023 | — |
| 424B5 | Prospectus supplement | Dec 14, 2023 | — |
| 8-K |
Current report
Other events
|
Dec 12, 2023 | Dec 10, 2023 |
| UPLOAD | Letter from the SEC | Dec 7, 2023 | — |
| CORRESP | Letter to the SEC | Nov 28, 2023 | — |
| UPLOAD | Letter from the SEC | Nov 13, 2023 | — |
| 10-Q | Quarterly report | Nov 2, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 2, 2023 | Nov 2, 2023 |
| SC 13G | Ownership over 5% (passive) | Oct 31, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Oct 5, 2023 | — |
| 8-K |
Current report
Other events
|
Oct 2, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Aug 10, 2023 | Aug 9, 2023 |
| 144 | Notice of proposed sale | Aug 9, 2023 | — |
| 10-Q | Quarterly report | Aug 3, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 3, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Aug 3, 2023 | Aug 2, 2023 |
| 144 | Notice of proposed sale | Aug 2, 2023 | — |
| 8-K |
Current report
Other events
|
Jul 24, 2023 | Jul 24, 2023 |
| 4 | Insider transaction | Jul 11, 2023 | Jul 10, 2023 |
| 144 | Notice of proposed sale | Jul 10, 2023 | — |
| 4 | Insider transaction | Jun 14, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 9, 2023 | Jun 9, 2023 |
| 144 | Notice of proposed sale | Jun 9, 2023 | — |
| 8-K |
Current report
Agreement ended, Other events
|
May 26, 2023 | May 26, 2023 |
| 424B5 | Prospectus supplement | May 26, 2023 | — |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Shareholder vote results
|
May 18, 2023 | May 17, 2023 |
| 4 | Insider transaction | May 10, 2023 | May 9, 2023 |
| 144 | Notice of proposed sale | May 9, 2023 | — |
| 10-Q | Quarterly report | May 8, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations, Officer or director change
|
May 8, 2023 | May 5, 2023 |
| DEFA14A | Additional proxy material | Apr 18, 2023 | — |
| 4 | Insider transaction | Apr 12, 2023 | Apr 10, 2023 |
| 4 | Insider transaction | Apr 12, 2023 | Apr 10, 2023 |
| 3 | Initial insider ownership | Apr 12, 2023 | Apr 10, 2023 |
| ARS | Annual report to shareholders | Apr 7, 2023 | Dec 31, 2022 |
| DEFA14A | Additional proxy material | Apr 7, 2023 | — |
| DEF 14A | Proxy statement | Apr 7, 2023 | — |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Mar 30, 2023 | Mar 29, 2023 |
| PRE 14A | Preliminary proxy statement | Mar 28, 2023 | — |
| 4 | Insider transaction | Mar 14, 2023 | Mar 13, 2023 |
| S-8 | Employee stock plan registration | Feb 28, 2023 | — |
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
- SNDX (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- New York, NY
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1395937
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.