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 |
|---|---|---|---|
| 10-Q | Quarterly report | Nov 5, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Agreement ended, Results of operations
|
Nov 5, 2026 | Nov 3, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Oct 27, 2026 | — |
| 4 | Insider transaction | Oct 26, 2026 | Oct 22, 2026 |
| 8-K |
Current report
Other events
|
Oct 22, 2026 | Oct 22, 2026 |
| 8-K |
Current report
Other events
|
Oct 5, 2026 | Oct 5, 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 | — |
| 8-K |
Current report
Other events
|
Aug 19, 2026 | 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 | — |
| 10-Q | Quarterly report | Aug 6, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Material agreement, Results of operations, Unregistered share sale
|
Aug 6, 2026 | Aug 5, 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 |
| 8-K |
Current report
Shareholder vote results
|
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 |
| 8-K |
Current report
Other events
|
May 19, 2026 | May 19, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| 424B3 | Prospectus | May 12, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 7, 2026 | May 7, 2026 |
| ARS | Annual report to shareholders | Apr 16, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 16, 2026 | — |
| DEF 14A | Proxy statement | Apr 16, 2026 | Jun 10, 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 | — |
| EFFECT | Filing | Mar 20, 2026 | — |
| 424B5 | Prospectus supplement | Mar 20, 2026 | — |
| CORRESP | Letter to the SEC | Mar 18, 2026 | — |
| UPLOAD | Letter from the SEC | Mar 18, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 17, 2026 | — |
| S-3 | Shelf registration | Mar 13, 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 | — |
| 10-K | Annual report | Mar 12, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 12, 2026 | Mar 12, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Mar 11, 2026 | — |
| 8-K |
Current report
Material agreement, Results of operations, Unregistered share sale, Regulation FD disclosure
|
Mar 9, 2026 | Mar 9, 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 | — |
| S-8 | Employee stock plan registration | Jan 27, 2026 | — |
| 8-K |
Current report
Other events
|
Jan 27, 2026 | Jan 27, 2026 |
| 8-K |
Current report
Other events
|
Jan 15, 2026 | Jan 15, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jan 5, 2026 | — |
| 8-K |
Current report
Officer or director change
|
Dec 18, 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 |
| 4 | Insider transaction | Dec 16, 2025 | Dec 15, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| 10-Q | Quarterly report | Nov 12, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Material agreement, Results of operations, Exit or restructuring costs, Officer or director change
|
Nov 12, 2025 | Nov 7, 2025 |
| 8-K |
Current report
Officer or director change
|
Oct 8, 2025 | Oct 7, 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 | — |
| 10-Q | Quarterly report | Aug 12, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2025 | Aug 12, 2025 |
| 8-K/A |
Amended current report
Shareholder vote results
|
Jun 18, 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 | Jun 12, 2025 | Jun 11, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 11, 2025 | Jun 11, 2025 |
| 10-Q | Quarterly report | May 7, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Exit or restructuring costs
|
May 7, 2025 | May 7, 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 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 |
| 8-K |
Current report
Officer or director change
|
Mar 27, 2025 | Mar 27, 2025 |
| S-8 | Employee stock plan registration | Mar 18, 2025 | — |
| 10-K | Annual report | Mar 18, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 18, 2025 | Mar 18, 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 |
| 8-K |
Current report
Officer or director change
|
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 |
| 8-K |
Current report
Other events
|
Jan 13, 2025 | Jan 13, 2025 |
| 424B3 | Prospectus | Dec 10, 2024 | — |
| 424B3 | Prospectus | Dec 10, 2024 | — |
| EFFECT | Filing | Dec 9, 2024 | — |
| EFFECT | Filing | Dec 9, 2024 | — |
| EFFECT | Filing | Dec 6, 2024 | — |
| 424B5 | Prospectus supplement | Dec 6, 2024 | — |
| CORRESP | Letter to the SEC | Dec 6, 2024 | — |
| UPLOAD | Letter from the SEC | Dec 6, 2024 | — |
| POS AM | Filing | Dec 2, 2024 | — |
| POS AM | Filing | Dec 2, 2024 | — |
| S-3 | Shelf registration | Dec 2, 2024 | — |
| 424B3 | Prospectus | Nov 21, 2024 | — |
| 424B3 | Prospectus | Nov 21, 2024 | — |
| 8-K |
Current report
Other events
|
Nov 21, 2024 | Nov 21, 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 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 12, 2024 | Nov 11, 2024 |
| 424B3 | Prospectus | Nov 12, 2024 | — |
| 424B3 | Prospectus | Nov 12, 2024 | — |
| 10-Q | Quarterly report | Nov 12, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Nov 12, 2024 | Nov 12, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| 144 | Notice of proposed sale | Nov 12, 2024 | — |
| 424B3 | Prospectus | Nov 4, 2024 | — |
| 424B3 | Prospectus | Nov 4, 2024 | — |
| 8-K |
Current report
Other events
|
Nov 4, 2024 | Nov 4, 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 | — |
| 424B3 | Prospectus | Sep 16, 2024 | — |
| 424B3 | Prospectus | Sep 16, 2024 | — |
| 8-K |
Current report
Material agreement
|
Sep 16, 2024 | Sep 13, 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 |
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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.