Korro Bio, Inc. (KRRO)
$12.91-$0.35 (-2.64%) Today
Korro Bio Inc is a biopharmaceutical company with a mission to discover, develop, and commercialize a new class of genetic medicines based on editing RNA, enabling the treatment of both rare and highly prevalent diseases. It is generating a portfolio of differentiated programs that are designed to harness the body's natural RNA editing process to effect a precise yet transient single base edit. By editing RNA instead of DNA, Korro Bio is expanding the reach of genetic medicines by delivering additional precision and tunability. The company operates and manages its business as one reportable segment and one operating segment, which is the business of discovering, developing and commercializing therapies derived from or incorporating its RNA-editing technology.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market purchase | 2 | 6,684 | $79K |
| Open-market sale | 24 | 349,871 | $4.87M |
| Grant or award | 10 | 115,062 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
47 Form 4 filings on record, the earliest from Oct 18, 2024, newest first. Filing history page 2 of 2.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Forest Baskett | Open-market purchase | Pre-Funded Warrants | 242,945 | $11.11 | $2.70M | |
| Forest Baskett | Open-market purchase | Common Stock | 207,100 | $11.11 | $2.30M | |
| Edward T. Mathers | Open-market purchase | Pre-Funded Warrants | 242,945 | $11.11 | $2.70M | |
| Edward T. Mathers | Open-market purchase | Common Stock | 207,100 | $11.11 | $2.30M | |
| Mohamad Makhzoumi | Open-market purchase | Common Stock | 207,100 | $11.11 | $2.30M | |
| Mohamad Makhzoumi | Open-market purchase | Pre-Funded Warrants | 242,945 | $11.11 | $2.70M | |
 Paul Edward Walker | Open-market purchase | Pre-Funded Warrants | 242,945 | $11.11 | $2.70M | |
| Paul Edward Walker | Open-market purchase | Common Stock | 207,100 | $11.11 | $2.30M | |
| Anthony A. Florence Jr. | Open-market purchase | Common Stock | 207,100 | $11.11 | $2.30M | |
| Anthony A. Florence Jr. | Open-market purchase | Pre-Funded Warrants | 242,945 | $11.11 | $2.70M | |
| Ram Aiyar - Officer | Grant or award | Common Stock | 40,000 | $0.00 | - | |
| Ram Aiyar - Officer | Grant or award | Stock Option (Right to Buy) | 80,000 | $0.00 | - | |
| Loic A. Vincent - Officer | Grant or award | Stock Option (Right to Buy) | 35,000 | $0.00 | - | |
| Oliver Dolan - Officer | Grant or award | Stock Option (Right to Buy) | 15,000 | $0.00 | - | |
| Jeffrey Cerio - Officer | Grant or award | Stock Option (Right to Buy) | 23,000 | $0.00 | - | |
| Todd Chappell - Officer | Grant or award | Stock Option (Right to Buy) | 38,000 | $0.00 | - | |
| Todd Chappell - Officer | Grant or award | Common Stock | 20,132 | $0.00 | - | |
| Loic A. Vincent - Officer | Grant or award | Common Stock | 21,715 | $0.00 | - | |
| Oliver Dolan - Officer | Grant or award | Common Stock | 21,482 | $0.00 | - | |
| Jeffrey Cerio - Officer | Grant or award | Common Stock | 41,902 | $0.00 | - | |
| Jean Francois Formela | Grant or award | Stock Option (Right to Buy) | 6,010 | $0.00 | - | |
| Vineet Agarwal - Officer | Option exercise | Common Stock | 800 | $11.68 | $9K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 800 | $70.00 | $56K | |
| Vineet Agarwal - Officer | Option exercise | Stock Option (Right to Buy) | 800 | $0.00 | - | |
| Vineet Agarwal - Officer | Option exercise | Common Stock | 9,263 | $11.68 | $108K | |
| Vineet Agarwal - Officer | Option exercise | Common Stock | 953 | $14.98 | $14K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 2,023 | $71.51 | $145K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 164 | $73.71 | $12K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 115 | $74.56 | $9K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 56 | $76.00 | $4K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 23 | $77.00 | $2K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 260 | $77.55 | $20K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 457 | $78.59 | $36K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 1,815 | $79.79 | $145K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 4,961 | $80.50 | $399K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 317 | $81.48 | $26K | |
| Vineet Agarwal - Officer | Open-market sale | Common Stock | 25 | $82.89 | $2K | |
| Vineet Agarwal - Officer | Option exercise | Stock Option (Right to Buy) | 9,263 | $0.00 | - | |
| Vineet Agarwal - Officer | Option exercise | Stock Option (Right to Buy) | 953 | $0.00 | - |
This is as far as the anonymous view goes. Create a free account for all 47 KRRO filings on record.
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| Atlas Venture Opportunity Fund II, L.P. | Shareholder | 51 | $700 | View on EDGAR | |
| Atlas Venture Fund XI, L.P. | Shareholder | 249 | $3K | View on EDGAR | |
| Atlas Venture Opportunity Fund II, L.P. | Shareholder | 4,884 | $65K | View on EDGAR |
Korro Bio, Inc. (KRRO) had 22 insider filings in the last 90 days, with the most recent on 2026-08-28. The full record for KRRO runs to 47 Form 4 filings, the earliest from 2024-10-18. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
2 insider purchases of KRRO were filed in the last 90 days, totaling $79K.
24 insider sales of KRRO were filed in the last 90 days, totaling $4.87M.
This page tracks KRRO Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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