Sionna Therapeutics, Inc. SEC filings SION
Sionna Therapeutics, Inc. has 231 filings in SEC EDGAR's recent list, going back to Sep 12, 2024. Its latest annual report, Form ARS, was filed on Apr 27, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 6, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Sep 14, 2026 (exit or restructuring costs, officer or director change, other events). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Sep 21, 2026 | — |
| 4 | Insider transaction | Sep 21, 2026 | Sep 17, 2026 |
| 4 | Insider transaction | Sep 18, 2026 | Sep 17, 2026 |
| 4 | Insider transaction | Sep 18, 2026 | Sep 17, 2026 |
| 4 | Insider transaction | Sep 18, 2026 | Sep 17, 2026 |
| 4 | Insider transaction | Sep 18, 2026 | Sep 17, 2026 |
| 144 | Notice of proposed sale | Sep 17, 2026 | — |
| 8-K |
Current report
Exit or restructuring costs, Officer or director change, Other events
|
Sep 14, 2026 | Sep 9, 2026 |
| 8-K |
Current report
Other events
|
Aug 10, 2026 | Aug 10, 2026 |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 6, 2026 | Aug 6, 2026 |
| 4 | Insider transaction | Jul 9, 2026 | Jul 7, 2026 |
| 4 | Insider transaction | Jul 9, 2026 | Jul 7, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 6, 2026 |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Jun 18, 2026 | Jun 17, 2026 |
| 144/A | Filing | Jun 1, 2026 | — |
| 4 | Insider transaction | May 29, 2026 | May 27, 2026 |
| 4 | Insider transaction | May 29, 2026 | May 27, 2026 |
| 144 | Notice of proposed sale | May 29, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | 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 |
| 4 | Insider transaction | May 11, 2026 | May 7, 2026 |
| 4 | Insider transaction | May 11, 2026 | May 7, 2026 |
| ARS | Annual report to shareholders | Apr 27, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 27, 2026 | — |
| DEF 14A | Proxy statement | Apr 27, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Apr 21, 2026 | Apr 17, 2026 |
| 4 | Insider transaction | Apr 21, 2026 | Apr 17, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Apr 20, 2026 | — |
| 4 | Insider transaction | Apr 16, 2026 | Apr 14, 2026 |
| 4 | Insider transaction | Apr 16, 2026 | Apr 14, 2026 |
| 4 | Insider transaction | Mar 6, 2026 | Mar 5, 2026 |
| 144 | Notice of proposed sale | Mar 5, 2026 | — |
| S-8 | Employee stock plan registration | Mar 2, 2026 | — |
| S-3ASR | Automatic shelf registration | Mar 2, 2026 | — |
| 10-K | Annual report | Mar 2, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 2, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Feb 4, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Feb 4, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Jan 26, 2026 | Jan 22, 2026 |
| 144 | Notice of proposed sale | Jan 22, 2026 | — |
| 144 | Notice of proposed sale | Jan 22, 2026 | — |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Jan 6, 2026 | Jan 2, 2026 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 24, 2025 |
| 4 | Insider transaction | Dec 29, 2025 | Dec 24, 2025 |
| 4 | Insider transaction | Dec 19, 2025 | Dec 17, 2025 |
| 4 | Insider transaction | Dec 19, 2025 | Dec 17, 2025 |
| 4 | Insider transaction | Dec 9, 2025 | Dec 5, 2025 |
| 144 | Notice of proposed sale | Dec 5, 2025 | — |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 4 | Insider transaction | Nov 26, 2025 | Nov 24, 2025 |
| 144 | Notice of proposed sale | Nov 24, 2025 | — |
| 4 | Insider transaction | Nov 24, 2025 | Nov 20, 2025 |
| 144 | Notice of proposed sale | Nov 21, 2025 | — |
| 144 | Notice of proposed sale | Nov 21, 2025 | — |
| 144 | Notice of proposed sale | Nov 21, 2025 | — |
| 144 | Notice of proposed sale | Nov 21, 2025 | — |
| 144 | Notice of proposed sale | Nov 20, 2025 | — |
| 144 | Notice of proposed sale | Nov 20, 2025 | — |
| 144 | Notice of proposed sale | Nov 20, 2025 | — |
| 144 | Notice of proposed sale | Nov 20, 2025 | — |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 144 | Notice of proposed sale | Nov 19, 2025 | — |
| 144 | Notice of proposed sale | Nov 19, 2025 | — |
| 144 | Notice of proposed sale | Nov 19, 2025 | — |
| 144 | Notice of proposed sale | Nov 19, 2025 | — |
| 144 | Notice of proposed sale | Nov 18, 2025 | — |
| 144 | Notice of proposed sale | Nov 18, 2025 | — |
| 144 | Notice of proposed sale | Nov 18, 2025 | — |
| 144 | Notice of proposed sale | Nov 18, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| 144 | Notice of proposed sale | Nov 17, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Nov 7, 2025 | — |
| 10-Q | Quarterly report | Nov 5, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 5, 2025 | Nov 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 31, 2025 | — |
| 4 | Insider transaction | Oct 28, 2025 | Oct 24, 2025 |
| 144 | Notice of proposed sale | Oct 28, 2025 | — |
| 144 | Notice of proposed sale | Oct 28, 2025 | — |
| 144 | Notice of proposed sale | Oct 28, 2025 | — |
| 144 | Notice of proposed sale | Oct 28, 2025 | — |
| 144 | Notice of proposed sale | Oct 24, 2025 | — |
| 144 | Notice of proposed sale | Oct 24, 2025 | — |
| 144 | Notice of proposed sale | Oct 24, 2025 | — |
| 144 | Notice of proposed sale | Oct 24, 2025 | — |
| 4 | Insider transaction | Oct 22, 2025 | Oct 21, 2025 |
| 4 | Insider transaction | Oct 21, 2025 | Oct 21, 2025 |
| 144 | Notice of proposed sale | Oct 21, 2025 | — |
| 144 | Notice of proposed sale | Oct 21, 2025 | — |
| 144 | Notice of proposed sale | Oct 21, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 20, 2025 | — |
| 4 | Insider transaction | Oct 20, 2025 | Oct 16, 2025 |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 144 | Notice of proposed sale | Oct 20, 2025 | — |
| 4 | Insider transaction | Oct 17, 2025 | Oct 15, 2025 |
| 144 | Notice of proposed sale | Oct 17, 2025 | — |
| 144 | Notice of proposed sale | Oct 17, 2025 | — |
| 144 | Notice of proposed sale | Oct 16, 2025 | — |
| 144 | Notice of proposed sale | Oct 16, 2025 | — |
| 144 | Notice of proposed sale | Oct 16, 2025 | — |
| 4 | Insider transaction | Oct 15, 2025 | Oct 10, 2025 |
| 144 | Notice of proposed sale | Oct 15, 2025 | — |
| 144 | Notice of proposed sale | Oct 14, 2025 | — |
| 144 | Notice of proposed sale | Oct 14, 2025 | — |
| 144 | Notice of proposed sale | Oct 10, 2025 | — |
| 144 | Notice of proposed sale | Oct 10, 2025 | — |
| 4 | Insider transaction | Oct 7, 2025 | Oct 3, 2025 |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
| 4 | Insider transaction | Oct 3, 2025 | Oct 1, 2025 |
| 3 | Initial insider ownership | Oct 3, 2025 | Oct 1, 2025 |
| 4 | Insider transaction | Oct 1, 2025 | Sep 29, 2025 |
| 144 | Notice of proposed sale | Oct 1, 2025 | — |
| 144 | Notice of proposed sale | Oct 1, 2025 | — |
| 144 | Notice of proposed sale | Sep 30, 2025 | — |
| 144 | Notice of proposed sale | Sep 30, 2025 | — |
| 4 | Insider transaction | Sep 30, 2025 | Sep 26, 2025 |
| 144 | Notice of proposed sale | Sep 29, 2025 | — |
| 144 | Notice of proposed sale | Sep 29, 2025 | — |
| 144 | Notice of proposed sale | Sep 26, 2025 | — |
| 4 | Insider transaction | Sep 5, 2025 | Sep 4, 2025 |
| 144 | Notice of proposed sale | Sep 4, 2025 | — |
| 4 | Insider transaction | Sep 3, 2025 | Aug 29, 2025 |
| 4 | Insider transaction | Aug 28, 2025 | Aug 26, 2025 |
| 4 | Insider transaction | Aug 28, 2025 | Aug 26, 2025 |
| 144 | Notice of proposed sale | Aug 26, 2025 | — |
| 144 | Notice of proposed sale | Aug 26, 2025 | — |
| 4 | Insider transaction | Aug 21, 2025 | Aug 20, 2025 |
| 4 | Insider transaction | Aug 21, 2025 | Aug 19, 2025 |
| 144 | Notice of proposed sale | Aug 20, 2025 | — |
| 144 | Notice of proposed sale | Aug 20, 2025 | — |
| 144 | Notice of proposed sale | Aug 19, 2025 | — |
| 10-Q | Quarterly report | Aug 11, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 11, 2025 | Aug 11, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 30, 2025 | — |
| 4 | Insider transaction | Jul 1, 2025 | Jun 27, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| 4 | Insider transaction | Jun 16, 2025 | Jun 12, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 16, 2025 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 13, 2025 | Jun 12, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 4, 2025 | Jun 4, 2025 |
| 10-Q | Quarterly report | May 12, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 12, 2025 | May 12, 2025 |
| ARS | Annual report to shareholders | Apr 29, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 29, 2025 | — |
| DEF 14A | Proxy statement | Apr 29, 2025 | Jun 12, 2025 |
| 3 | Initial insider ownership | Apr 1, 2025 | Apr 1, 2025 |
| 10-K | Annual report | Mar 20, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 20, 2025 | Mar 20, 2025 |
| SCHEDULE 13D | Ownership over 5% (active) | Feb 18, 2025 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Feb 18, 2025 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Feb 18, 2025 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Feb 18, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 14, 2025 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Feb 13, 2025 | — |
| 4 | Insider transaction | Feb 12, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 6, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 10, 2025 |
| 4 | Insider transaction | Feb 10, 2025 | Feb 6, 2025 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Feb 10, 2025 | Feb 6, 2025 |
| S-8 | Employee stock plan registration | Feb 7, 2025 | — |
| 424B4 | Prospectus | Feb 7, 2025 | — |
| SEC STAFF LETTER | Filing | Feb 6, 2025 | — |
| EFFECT | Filing | Feb 6, 2025 | — |
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
- SION (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Waltham, MA
- SEC filer status
- , Emerging growth company
- SEC CIK
- 2036042
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.