Korro Bio, Inc. SEC filings KRRO
Korro Bio, Inc. has 830 filings in SEC EDGAR's recent list, going back to Apr 14, 2017. Its latest annual report, Form ARS, was filed on Apr 16, 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 (agreement ended, results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 27, 2026 | — |
| 4 | Insider transaction | Oct 26, 2026 | Oct 22, 2026 |
| 4 | Insider transaction | Sep 15, 2026 | Sep 11, 2026 |
| 144 | Notice of proposed sale | Sep 14, 2026 | — |
| 144 | Notice of proposed sale | Sep 14, 2026 | — |
| 4 | Insider transaction | Sep 14, 2026 | Sep 11, 2026 |
| 144 | Notice of proposed sale | Sep 11, 2026 | — |
| 144 | Notice of proposed sale | Sep 11, 2026 | — |
| 144 | Notice of proposed sale | Sep 11, 2026 | — |
| 4 | Insider transaction | Sep 10, 2026 | Sep 8, 2026 |
| 144 | Notice of proposed sale | Sep 9, 2026 | — |
| 144 | Notice of proposed sale | Sep 8, 2026 | — |
| 4 | Insider transaction | Aug 28, 2026 | Aug 26, 2026 |
| 144 | Notice of proposed sale | Aug 26, 2026 | — |
| 144 | Notice of proposed sale | Aug 26, 2026 | — |
| 4 | Insider transaction | Aug 21, 2026 | Aug 19, 2026 |
| 144 | Notice of proposed sale | Aug 19, 2026 | — |
| 144 | Notice of proposed sale | Aug 19, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| 4 | Insider transaction | Aug 13, 2026 | Aug 11, 2026 |
| 4 | Insider transaction | Aug 13, 2026 | Aug 6, 2026 |
| 144 | Notice of proposed sale | Aug 11, 2026 | — |
| 144 | Notice of proposed sale | Aug 11, 2026 | — |
| 4 | Insider transaction | Aug 5, 2026 | Aug 4, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Aug 4, 2026 | — |
| 144 | Notice of proposed sale | Aug 4, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jul 29, 2026 | — |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 2026 |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 6, 2026 | — |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| 144 | Notice of proposed sale | Jun 24, 2026 | — |
| 144 | Notice of proposed sale | Jun 24, 2026 | — |
| 144 | Notice of proposed sale | Jun 23, 2026 | — |
| 144 | Notice of proposed sale | Jun 23, 2026 | — |
| 144 | Notice of proposed sale | Jun 22, 2026 | — |
| 144 | Notice of proposed sale | Jun 22, 2026 | — |
| 4 | Insider transaction | Jun 17, 2026 | Jun 16, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 16, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 16, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 16, 2026 |
| 144 | Notice of proposed sale | Jun 16, 2026 | — |
| 144 | Notice of proposed sale | Jun 16, 2026 | — |
| 144 | Notice of proposed sale | Jun 16, 2026 | — |
| 144 | Notice of proposed sale | Jun 16, 2026 | — |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Jun 2, 2026 | May 29, 2026 |
| 4 | Insider transaction | Jun 1, 2026 | May 28, 2026 |
| 144 | Notice of proposed sale | May 29, 2026 | — |
| 4 | Insider transaction | May 28, 2026 | May 26, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 2, 2026 | — |
| 4 | Insider transaction | Apr 2, 2026 | Mar 31, 2026 |
| 3 | Initial insider ownership | Apr 2, 2026 | Mar 31, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 17, 2026 | — |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| 4 | Insider transaction | Mar 12, 2026 | Mar 10, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Mar 12, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 11, 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 13, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2026 | — |
| 4 | Insider transaction | Feb 3, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Feb 2, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Feb 2, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jan 30, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jan 5, 2026 | — |
| 4 | Insider transaction | Dec 16, 2025 | Dec 15, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 15, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 15, 2025 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 15, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 13, 2025 | — |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 3 | Initial insider ownership | Apr 1, 2025 | Mar 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 14, 2025 | — |
| 3 | Initial insider ownership | Feb 11, 2025 | Feb 11, 2025 |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 5, 2025 | — |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| 4 | Insider transaction | Feb 5, 2025 | Feb 3, 2025 |
| 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 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 12, 2024 | Nov 11, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| 144 | Notice of proposed sale | Nov 12, 2024 | — |
| 4 | Insider transaction | Oct 18, 2024 | Oct 17, 2024 |
| 144 | Notice of proposed sale | Oct 17, 2024 | — |
| 144 | Notice of proposed sale | Oct 16, 2024 | — |
| 4 | Insider transaction | Sep 3, 2024 | Sep 3, 2024 |
| 3 | Initial insider ownership | Sep 3, 2024 | Aug 30, 2024 |
| 144 | Notice of proposed sale | Aug 30, 2024 | — |
| 4 | Insider transaction | Aug 28, 2024 | Aug 26, 2024 |
| 3 | Initial insider ownership | Aug 28, 2024 | Aug 26, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 12, 2024 | — |
| 4 | Insider transaction | Jun 12, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 12, 2024 | Jun 11, 2024 |
| 4 | Insider transaction | Jun 4, 2024 | Jun 3, 2024 |
| 3 | Initial insider ownership | May 14, 2024 | May 13, 2024 |
| SC 13G | Ownership over 5% (passive) | Apr 26, 2024 | — |
| SC 13D/A | Amended ownership over 5% (active) | Apr 24, 2024 | — |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 24, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Apr 22, 2024 |
| 4 | Insider transaction | Apr 23, 2024 | Apr 22, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Feb 9, 2024 | — |
| 4 | Insider transaction | Nov 29, 2023 | Nov 27, 2023 |
| 3 | Initial insider ownership | Nov 29, 2023 | Nov 27, 2023 |
| 4 | Insider transaction | Nov 27, 2023 | Nov 22, 2023 |
| 144 | Notice of proposed sale | Nov 22, 2023 | — |
| 4 | Insider transaction | Nov 22, 2023 | Nov 3, 2023 |
| 144 | Notice of proposed sale | Nov 20, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Nov 17, 2023 | — |
| SC 13D | Ownership over 5% (active) | Nov 17, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Nov 16, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Nov 13, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Nov 13, 2023 | — |
| SC 13D | Ownership over 5% (active) | Nov 13, 2023 | — |
| 144 | Notice of proposed sale | Nov 13, 2023 | — |
| 144 | Notice of proposed sale | Nov 13, 2023 | — |
| 144 | Notice of proposed sale | Nov 13, 2023 | — |
| 144 | Notice of proposed sale | Nov 13, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Nov 9, 2023 | — |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 2023 |
| 3 | Initial insider ownership | Nov 7, 2023 | Nov 3, 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
- KRRO (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Cambridge, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company
- SEC CIK
- 1703647
- Former names
- Frequency Therapeutics, Inc. (until Nov 6, 2023)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.