Assembly Biosciences, Inc. SEC filings ASMB
Assembly Biosciences, Inc. has 901 filings in SEC EDGAR's recent list, going back to Feb 7, 2008. 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 Aug 13, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 13, 2026 (acquisition or sale of assets). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 4 | Insider transaction | Nov 3, 2026 | Oct 30, 2026 |
| 144 | Notice of proposed sale | Nov 2, 2026 | — |
| 144 | Notice of proposed sale | Nov 2, 2026 | — |
| 144 | Notice of proposed sale | Nov 2, 2026 | — |
| S-8 | Employee stock plan registration | Aug 20, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| 8-K/A |
Amended current report
Results of operations
|
Aug 14, 2026 | Aug 13, 2026 |
| 10-Q | Quarterly report | Aug 13, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Acquisition or sale of assets
|
Aug 13, 2026 | Aug 13, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 4, 2026 | — |
| 4 | Insider transaction | Jun 18, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Mar 29, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 5, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | May 27, 2026 | May 26, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 27, 2026 | — |
| 8-K |
Current report
Material agreement, Other events
|
May 26, 2026 | May 21, 2026 |
| 424B5 | Prospectus supplement | May 26, 2026 | — |
| 424B5 | Prospectus supplement | May 22, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
May 22, 2026 | May 22, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 11, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| DEFA14A | Additional proxy material | Apr 22, 2026 | — |
| DEF 14A | Proxy statement | Apr 22, 2026 | Jun 4, 2026 |
| ARS | Annual report to shareholders | Apr 22, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 29, 2026 |
| 4 | Insider transaction | Mar 31, 2026 | Mar 29, 2026 |
| 8-K |
Current report
Officer or director change
|
Mar 30, 2026 | Mar 24, 2026 |
| EFFECT | Filing | Mar 27, 2026 | — |
| CORRESP | Letter to the SEC | Mar 25, 2026 | — |
| UPLOAD | Letter from the SEC | Mar 24, 2026 | — |
| S-3 | Shelf registration | Mar 19, 2026 | — |
| S-8 | Employee stock plan registration | Mar 19, 2026 | — |
| 10-K | Annual report | Mar 19, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 19, 2026 | Mar 19, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 9, 2026 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Dec 8, 2025 | Dec 8, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 8, 2025 | — |
| EFFECT | Filing | Nov 21, 2025 | — |
| 424B3 | Prospectus | Nov 21, 2025 | — |
| CORRESP | Letter to the SEC | Nov 19, 2025 | — |
| 10-Q | Quarterly report | Nov 10, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 10, 2025 | Nov 10, 2025 |
| S-3 | Shelf registration | Oct 14, 2025 | — |
| 4 | Insider transaction | Oct 3, 2025 | Aug 8, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 18, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 18, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 15, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 15, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 12, 2025 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Aug 12, 2025 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Other events
|
Aug 11, 2025 | Aug 8, 2025 |
| 424B5 | Prospectus supplement | Aug 11, 2025 | — |
| 424B5 | Prospectus supplement | Aug 11, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Aug 8, 2025 | Aug 8, 2025 |
| S-3MEF | Filing | Aug 7, 2025 | — |
| S-8 | Employee stock plan registration | Aug 6, 2025 | — |
| 10-Q | Quarterly report | Aug 6, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Other events
|
Aug 6, 2025 | Aug 6, 2025 |
| 8-K |
Current report
Other events
|
Jun 25, 2025 | Jun 25, 2025 |
| 4 | Insider transaction | Jun 17, 2025 | Jun 16, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 4 | Insider transaction | Jun 9, 2025 | Jun 5, 2025 |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 2025 |
| DEFA14A | Additional proxy material | Apr 23, 2025 | — |
| DEF 14A | Proxy statement | Apr 23, 2025 | Jun 5, 2025 |
| ARS | Annual report to shareholders | Apr 23, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Apr 15, 2025 | Mar 31, 2025 |
| EFFECT | Filing | Apr 1, 2025 | — |
| 4 | Insider transaction | Apr 1, 2025 | Mar 29, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 29, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 29, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 29, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Mar 29, 2025 |
| CORRESP | Letter to the SEC | Mar 28, 2025 | — |
| UPLOAD | Letter from the SEC | Mar 26, 2025 | — |
| S-3 | Shelf registration | Mar 20, 2025 | — |
| 10-K | Annual report | Mar 20, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 20, 2025 | Mar 20, 2025 |
| 8-K |
Current report
Other events
|
Feb 20, 2025 | Feb 20, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| 8-K |
Current report
Material agreement, New debt
|
Jan 3, 2025 | Dec 30, 2024 |
| 4 | Insider transaction | Dec 31, 2024 | Dec 30, 2024 |
| 8-K |
Current report
Other events
|
Dec 26, 2024 | Dec 26, 2024 |
| 4 | Insider transaction | Dec 23, 2024 | Dec 19, 2024 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 23, 2024 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Dec 23, 2024 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 23, 2024 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Dec 19, 2024 | Dec 19, 2024 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Dec 13, 2024 | Dec 12, 2024 |
| 4 | Insider transaction | Nov 26, 2024 | Nov 22, 2024 |
| 4 | Insider transaction | Nov 19, 2024 | Nov 18, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| 8-K |
Current report
Material agreement
|
Nov 7, 2024 | Nov 7, 2024 |
| 424B5 | Prospectus supplement | Nov 7, 2024 | — |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2024 | Nov 7, 2024 |
| 4 | Insider transaction | Oct 9, 2024 | Oct 8, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Oct 3, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Oct 3, 2024 |
| 8-K |
Current report
Other events
|
Sep 23, 2024 | Sep 23, 2024 |
| S-8 | Employee stock plan registration | Aug 8, 2024 | — |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Aug 2, 2024 |
| 4 | Insider transaction | Aug 5, 2024 | Aug 2, 2024 |
| 4 | Insider transaction | Jul 8, 2024 | Jul 3, 2024 |
| SC 13D/A | Amended ownership over 5% (active) | Jun 24, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Jun 20, 2024 | — |
| 4 | Insider transaction | Jun 20, 2024 | Jun 17, 2024 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Jun 18, 2024 | Jun 16, 2024 |
| 424B5 | Prospectus supplement | Jun 18, 2024 | — |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 3, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 30, 2024 | May 29, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 23, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 23, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 23, 2024 |
| 4 | Insider transaction | May 24, 2024 | May 23, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| 4 | Insider transaction | May 1, 2024 | Apr 29, 2024 |
| 4 | Insider transaction | May 1, 2024 | Apr 29, 2024 |
| 4 | Insider transaction | May 1, 2024 | Apr 29, 2024 |
| DEFA14A | Additional proxy material | Apr 17, 2024 | — |
| DEF 14A | Proxy statement | Apr 17, 2024 | May 29, 2024 |
| ARS | Annual report to shareholders | Apr 17, 2024 | Dec 31, 2023 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Mar 29, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Mar 29, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Mar 29, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Mar 29, 2024 |
| 4 | Insider transaction | Mar 29, 2024 | Mar 27, 2024 |
| 10-K | Annual report | Mar 28, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Mar 28, 2024 | Mar 28, 2024 |
| 3 | Initial insider ownership | Mar 15, 2024 | Mar 13, 2024 |
| 8-K |
Current report
Officer or director change
|
Mar 15, 2024 | Mar 12, 2024 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Other events
|
Feb 13, 2024 | Feb 8, 2024 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Feb 2, 2024 | Jan 31, 2024 |
| 4 | Insider transaction | Jan 19, 2024 | Jan 17, 2024 |
| 8-K |
Current report
Agreement ended
|
Jan 17, 2024 | Jan 11, 2024 |
| DEFA14A | Additional proxy material | Dec 21, 2023 | — |
| DEF 14A | Proxy statement | Dec 21, 2023 | Jan 31, 2024 |
| PRE 14A | Preliminary proxy statement | Dec 11, 2023 | Jan 31, 2024 |
| 3 | Initial insider ownership | Dec 11, 2023 | Dec 7, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Dec 7, 2023 | Dec 1, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Nov 22, 2023 | — |
| 4 | Insider transaction | Nov 22, 2023 | Nov 20, 2023 |
| 4 | Insider transaction | Nov 21, 2023 | Nov 17, 2023 |
| 4 | Insider transaction | Nov 13, 2023 | Nov 8, 2023 |
| 3 | Initial insider ownership | Nov 13, 2023 | Nov 8, 2023 |
| 10-Q | Quarterly report | Nov 8, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 8, 2023 | Nov 8, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Nov 3, 2023 | — |
| SC 13D | Ownership over 5% (active) | Oct 31, 2023 | — |
| 3 | Initial insider ownership | Oct 31, 2023 | Oct 23, 2023 |
| 3 | Initial insider ownership | Oct 25, 2023 | Oct 16, 2023 |
| SC 13D | Ownership over 5% (active) | Oct 25, 2023 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Oct 17, 2023 | Oct 15, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 4 | Insider transaction | Oct 4, 2023 | Oct 2, 2023 |
| 144 | Notice of proposed sale | Oct 3, 2023 | — |
| 144 | Notice of proposed sale | Oct 3, 2023 | — |
| 8-K |
Current report
Listing notice
|
Sep 29, 2023 | Sep 27, 2023 |
| 3 | Initial insider ownership | Sep 18, 2023 | Sep 13, 2023 |
| S-8 | Employee stock plan registration | Aug 9, 2023 | — |
| 10-Q | Quarterly report | Aug 9, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2023 | Aug 9, 2023 |
| 8-K |
Current report
Material agreement, New debt
|
Aug 7, 2023 | Aug 4, 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
- ASMB (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- South San Francisco, CA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1426800
- Former names
- VENTRUS BIOSCIENCES INC (until Jul 11, 2014)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.