Korsana Biosciences, Inc. SEC filings KRSA
Korsana Biosciences, Inc. has 389 filings in SEC EDGAR's recent list, going back to Oct 9, 2018. Its latest annual report, Form 10-K, was filed on Mar 30, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 4, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Sep 11, 2026 (material agreement, acquisition or sale of assets, results of operations, unregistered share sale, change to shareholder rights, change in control, officer or director change, bylaw or fiscal year change, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 144 | Notice of proposed sale | Oct 22, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 15, 2026 | — |
| DEF 14A | Proxy statement | Oct 15, 2026 | Nov 13, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 7, 2026 | — |
| PRE 14A | Preliminary proxy statement | Oct 5, 2026 | Oct 5, 2026 |
| 144 | Notice of proposed sale | Sep 23, 2026 | — |
| 144 | Notice of proposed sale | Sep 22, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 18, 2026 | — |
| 144 | Notice of proposed sale | Sep 18, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Sep 16, 2026 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Sep 15, 2026 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Sep 11, 2026 | — |
| 8-K |
Current report
Material agreement, Acquisition or sale of assets, Results of operations, Unregistered share sale, Change to shareholder rights, Change in control, Officer or director change, Bylaw or fiscal year change, Regulation FD disclosure
|
Sep 11, 2026 | Sep 8, 2026 |
| 4 | Insider transaction | Sep 10, 2026 | Sep 9, 2026 |
| 4 | Insider transaction | Sep 10, 2026 | Sep 9, 2026 |
| 4 | Insider transaction | Sep 10, 2026 | Sep 9, 2026 |
| 4 | Insider transaction | Sep 10, 2026 | Sep 9, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 3 | Initial insider ownership | Sep 10, 2026 | Sep 8, 2026 |
| 8-K |
Current report
Shareholder vote results, Other events
|
Aug 27, 2026 | Aug 26, 2026 |
| 425 | Filing | Aug 25, 2026 | — |
| 8-K |
Current report
Other events
|
Aug 25, 2026 | Aug 25, 2026 |
| 4 | Insider transaction | Aug 18, 2026 | Aug 14, 2026 |
| 4 | Insider transaction | Aug 18, 2026 | Aug 14, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 14, 2026 | — |
| 425 | Filing | Aug 12, 2026 | — |
| 425 | Filing | Aug 10, 2026 | — |
| 425 | Filing | Aug 6, 2026 | — |
| 10-Q | Quarterly report | Aug 4, 2026 | Jun 30, 2026 |
| 425 | Filing | Aug 3, 2026 | — |
| EFFECT | Filing | Jul 24, 2026 | — |
| 424B3 | Prospectus | Jul 24, 2026 | — |
| S-4/A | Filing | Jul 22, 2026 | — |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Jul 20, 2026 | — |
| 4 | Insider transaction | Jul 20, 2026 | Jul 16, 2026 |
| 425 | Filing | Jul 10, 2026 | — |
| S-4/A | Filing | Jul 10, 2026 | — |
| S-4/A | Filing | Jun 9, 2026 | — |
| 10-Q | Quarterly report | May 12, 2026 | Mar 31, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 7, 2026 | — |
| 10-K/A | Amended annual report | Apr 30, 2026 | Dec 31, 2025 |
| S-4 | Registration for a merger or exchange | Apr 20, 2026 | — |
| 425 | Filing | Apr 1, 2026 | — |
| 8-K |
Current report
Material agreement, Change in control, Officer or director change, Regulation FD disclosure
|
Apr 1, 2026 | Apr 1, 2026 |
| 10-K | Annual report | Mar 30, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Feb 17, 2026 | Feb 17, 2026 |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Jan 6, 2026 | Jan 3, 2026 |
| 8-K |
Current report
Other events
|
Dec 1, 2025 | Dec 1, 2025 |
| 10-Q | Quarterly report | Nov 12, 2025 | Sep 30, 2025 |
| 10-K/A | Amended annual report | Nov 12, 2025 | Dec 31, 2024 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 17, 2025 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Sep 23, 2025 | Sep 19, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 4 | Insider transaction | Aug 11, 2025 | Aug 7, 2025 |
| 10-Q | Quarterly report | Aug 5, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 18, 2025 | Jun 16, 2025 |
| EFFECT | Filing | May 15, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| CORRESP | Letter to the SEC | May 13, 2025 | — |
| UPLOAD | Letter from the SEC | May 12, 2025 | — |
| 8-K |
Current report
Material agreement
|
May 7, 2025 | May 7, 2025 |
| 424B5 | Prospectus supplement | May 7, 2025 | — |
| S-3 | Shelf registration | May 6, 2025 | — |
| 10-Q | Quarterly report | May 6, 2025 | Mar 31, 2025 |
| DEFA14A | Additional proxy material | Apr 29, 2025 | — |
| DEF 14A | Proxy statement | Apr 29, 2025 | Jun 16, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 28, 2025 | — |
| 4 | Insider transaction | Mar 27, 2025 | Mar 25, 2025 |
| 4 | Insider transaction | Mar 27, 2025 | Mar 25, 2025 |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Mar 25, 2025 | Mar 21, 2025 |
| 10-K | Annual report | Mar 4, 2025 | Dec 31, 2024 |
| EFFECT | Filing | Feb 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2025 | — |
| CORRESP | Letter to the SEC | Feb 10, 2025 | — |
| UPLOAD | Letter from the SEC | Feb 7, 2025 | — |
| S-3 | Shelf registration | Feb 4, 2025 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Dec 17, 2024 | Dec 13, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Dec 6, 2024 | — |
| 4 | Insider transaction | Nov 25, 2024 | Nov 21, 2024 |
| 10-Q | Quarterly report | Nov 14, 2024 | Sep 30, 2024 |
| 4 | Insider transaction | Aug 7, 2024 | Aug 5, 2024 |
| 8-K |
Current report
Regulation FD disclosure
|
Aug 7, 2024 | Aug 7, 2024 |
| 10-Q | Quarterly report | Aug 7, 2024 | Jun 30, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 12, 2024 | — |
| 8-K |
Current report
Shareholder vote results
|
Jun 14, 2024 | Jun 14, 2024 |
| 10-Q | Quarterly report | May 7, 2024 | Mar 31, 2024 |
| DEFA14A | Additional proxy material | Apr 29, 2024 | — |
| DEF 14A | Proxy statement | Apr 29, 2024 | Jun 14, 2024 |
| 8-K |
Current report
Other events
|
Apr 18, 2024 | Apr 18, 2024 |
| 3 | Initial insider ownership | Mar 11, 2024 | Mar 4, 2024 |
| 10-K | Annual report | Mar 5, 2024 | Dec 31, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2024 | — |
| 4 | Insider transaction | Jan 26, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 26, 2024 | Jan 1, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2024 | — |
| UPLOAD | Letter from the SEC | Dec 28, 2023 | — |
| CORRESP | Letter to the SEC | Dec 12, 2023 | — |
| 3 | Initial insider ownership | Dec 11, 2023 | Nov 30, 2023 |
| 3 | Initial insider ownership | Dec 7, 2023 | Nov 30, 2023 |
| 3/A | Filing | Dec 7, 2023 | Dec 1, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Dec 5, 2023 | — |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 4, 2023 | Dec 1, 2023 |
| 3 | Initial insider ownership | Dec 4, 2023 | Dec 1, 2023 |
| 4 | Insider transaction | Dec 4, 2023 | Nov 30, 2023 |
| 4 | Insider transaction | Dec 4, 2023 | Nov 30, 2023 |
| 4 | Insider transaction | Dec 4, 2023 | Nov 30, 2023 |
| 4 | Insider transaction | Dec 4, 2023 | Nov 30, 2023 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Dec 1, 2023 | Nov 30, 2023 |
| UPLOAD | Letter from the SEC | Nov 28, 2023 | — |
| 8-K |
Current report
Officer or director change
|
Nov 24, 2023 | Nov 19, 2023 |
| 10-Q | Quarterly report | Nov 13, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Officer or director change
|
Oct 23, 2023 | Oct 17, 2023 |
| SC 13G | Ownership over 5% (passive) | Sep 5, 2023 | — |
| 4 | Insider transaction | Aug 11, 2023 | Aug 9, 2023 |
| S-8 | Employee stock plan registration | Jul 31, 2023 | — |
| 10-Q | Quarterly report | Jul 28, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Shareholder vote results
|
Jul 19, 2023 | Jul 19, 2023 |
| 8-K |
Current report
Other events
|
Jul 12, 2023 | Jul 12, 2023 |
| 8-K |
Current report
Officer or director change
|
Jun 27, 2023 | Jun 27, 2023 |
| DEFM14A | Filing | Jun 20, 2023 | — |
| PREM14A | Filing | Jun 9, 2023 | Jun 9, 2023 |
| 8-K |
Current report
Other events
|
Jun 1, 2023 | Jun 1, 2023 |
| D | Filing | May 25, 2023 | — |
| 8-K |
Current report
Unregistered share sale, Bylaw or fiscal year change
|
May 25, 2023 | May 19, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | May 23, 2023 | — |
| 4 | Insider transaction | May 22, 2023 | May 19, 2023 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change, Shareholder vote results, Regulation FD disclosure, Other events
|
May 15, 2023 | May 15, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | May 12, 2023 | — |
| 10-Q | Quarterly report | May 12, 2023 | Mar 31, 2023 |
| DEFA14A | Additional proxy material | May 12, 2023 | — |
| 8-K |
Current report
Material agreement, Results of operations, Unregistered share sale, Regulation FD disclosure, Other events
|
May 12, 2023 | May 11, 2023 |
| DEFA14A | Additional proxy material | Apr 3, 2023 | — |
| DEF 14A | Proxy statement | Apr 3, 2023 | May 15, 2023 |
| 8-K |
Current report
Regulation FD disclosure
|
Apr 3, 2023 | Mar 31, 2023 |
| SC 13D/A | Amended ownership over 5% (active) | Apr 3, 2023 | — |
| PRE 14A | Preliminary proxy statement | Mar 22, 2023 | May 15, 2023 |
| 10-K | Annual report | Mar 22, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations
|
Mar 22, 2023 | Mar 22, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Jan 13, 2023 | — |
| 8-K |
Current report
Listing notice
|
Nov 29, 2022 | Nov 29, 2022 |
| 8-K |
Current report
Other events
|
Nov 22, 2022 | Nov 22, 2022 |
| SC 13D/A | Amended ownership over 5% (active) | Nov 21, 2022 | — |
| 10-Q | Quarterly report | Nov 3, 2022 | Sep 30, 2022 |
| SC 13D | Ownership over 5% (active) | Oct 21, 2022 | — |
| 8-K |
Current report
Exit or restructuring costs, Regulation FD disclosure
|
Oct 6, 2022 | Oct 6, 2022 |
| 8-K |
Current report
Officer or director change
|
Sep 30, 2022 | Sep 30, 2022 |
| S-8 | Employee stock plan registration | Aug 10, 2022 | — |
| 10-Q | Quarterly report | Aug 9, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations
|
Aug 9, 2022 | Aug 9, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jul 28, 2022 | Jul 28, 2022 |
| 4/A | Form 4/a | Jul 27, 2022 | Jul 25, 2022 |
| 4 | Insider transaction | Jul 26, 2022 | Jul 25, 2022 |
| 3 | Initial insider ownership | Jul 26, 2022 | Jul 25, 2022 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Jul 26, 2022 | Jul 26, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 4 | Insider transaction | Jun 16, 2022 | Jun 14, 2022 |
| 8-K |
Current report
Shareholder vote results
|
Jun 15, 2022 | Jun 15, 2022 |
| 8-K |
Current report
Regulation FD disclosure
|
Jun 10, 2022 | Jun 10, 2022 |
| 8-K |
Current report
Listing notice
|
Jun 3, 2022 | Jun 3, 2022 |
| 10-Q | Quarterly report | May 4, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations
|
May 4, 2022 | May 4, 2022 |
| DEFA14A | Additional proxy material | Apr 26, 2022 | — |
| DEF 14A | Proxy statement | Apr 26, 2022 | Jun 14, 2022 |
| 10-K | Annual report | Feb 24, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations
|
Feb 24, 2022 | Feb 24, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| 4 | Insider transaction | Jan 24, 2022 | Jan 20, 2022 |
| 4 | Insider transaction | Jan 24, 2022 | Jan 20, 2022 |
| 4 | Insider transaction | Jan 24, 2022 | Jan 3, 2022 |
| 4 | Insider transaction | Jan 24, 2022 | Jan 20, 2022 |
| 4 | Insider transaction | Dec 10, 2021 | Dec 9, 2021 |
| 4 | Insider transaction | Dec 10, 2021 | Dec 9, 2021 |
| 4 | Insider transaction | Dec 10, 2021 | Dec 9, 2021 |
| 10-Q | Quarterly report | Nov 9, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2021 | Nov 9, 2021 |
| 8-K |
Current report
Officer or director change
|
Oct 28, 2021 | Oct 27, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Sep 30, 2021 | Sep 30, 2021 |
| UPLOAD | Letter from the SEC | Sep 7, 2021 | — |
| 10-Q/A | Amended quarterly report | Aug 27, 2021 | Jun 30, 2021 |
| 10-Q/A | Amended quarterly report | Aug 27, 2021 | Mar 31, 2021 |
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
- KRSA (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- MA
- Headquarters
- Waltham, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1755237
- Former names
- Cyclerion Therapeutics, Inc. (until Aug 27, 2026)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.