Korro Bio, Inc.
KRRO- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001703647
In the last 90 days, Korro Bio, Inc. insiders filed 1 open-market purchase and 8 sales; 106 institutions reported holding it in 13F filings for Q2 2026, worth $190.1M in total; no superinvestor holds it.
Open-market trades, last 90 days
Open-market purchases (P) and sales (S) by Korro Bio, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.
- Open-market buys
- 1 filing
- 1 insider, $78.8K in total
- Open-market sells
- 8 filings
- 3 insiders, $2.82M in total
- Insiders trading
- 4
- Net value
- −$2.75M
- Purchases minus sales
Insider roster
Directors, officers and 10% owners who have filed a Form 4 for Korro Bio, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.
| Name | Title | Last reported holding | Last filing | Filings, past year |
|---|---|---|---|---|
| Formela Jean Francois | Director | 132,650Indirect | Sep 15, 2026 | 8 |
| Dolan Oliver | Senior Vice President, Finance | 16,241 | Sep 14, 2026 | 6 |
| Nichols Weston | 10% Owner | 1,544,980Indirect | Aug 13, 2026 | 2 |
| Lynx1 Capital Management LP | 10% Owner | 1,544,980Indirect | Aug 13, 2026 | 2 |
| Aiyar Ram | President and CEO | 69,046 | Aug 5, 2026 | 4 |
| Vincent Loic A | Chief Scientific Officer | 25,797 | Jul 17, 2026 | 4 |
| Cerio Jeffrey | General Counsel | 41,793 | Jul 17, 2026 | 4 |
| Chappell Todd | Chief Operating Officer | 24,464 | Jul 17, 2026 | 4 |
| Bermingham Nessan | Director | 35,114 | Jun 11, 2026 | 1 |
| Pearson Timothy R | Director | – | Jun 11, 2026 | 1 |
| Behbahani Ali | Director | 1,297,893Indirect | Jun 11, 2026 | 2 |
| Knobil Katharine | Director | – | Jun 11, 2026 | 1 |
| Meyers Rachel | Director | – | Jun 11, 2026 | 1 |
| New Enterprise Associates 17, L.P. | 10% Owner | 1,297,893 | Mar 12, 2026 | 1 |
| NEA Partners 17, L.P. | 10% Owner | 1,297,893 | Mar 12, 2026 | 1 |
| Nea 17 GP, LLC | 10% Owner | 1,297,893 | Mar 12, 2026 | 1 |
| Sandell Scott D | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Baskett Forest | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Mathers Edward T | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Walker Paul Edward | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Florence Anthony A. Jr. | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Makhzoumi Mohamad | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Chang Carmen | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Yang Rick | 10% Owner | 1,297,893Indirect | Mar 12, 2026 | 1 |
| Agarwal Vineet | Chief Financial Officer | 0 | Feb 5, 2025 | 0 |
| Olugemo Olukemi | Chief Medical Officer | – | Feb 5, 2025 | 0 |
| Lucchino David L. | Director | 22,150 | Jun 12, 2024 | 0 |
| Atlas Venture Opportunity Fund II, L.P. | 10% Owner | 195,074 | Apr 23, 2024 | 0 |
| Atlas Venture Associates Opportunity II, LLC | 10% Owner | 195,074 | Apr 23, 2024 | 0 |
| Atlas Venture Associates Opportunity II, LP | 10% Owner | 195,074 | Apr 23, 2024 | 0 |
| Colletti Steve | Chief Scientific Officer | – | Nov 7, 2023 | 0 |
| Walker Shelby J. | See Remarks | – | Nov 7, 2023 | 0 |
| Mitrano Richard J. | VP Finance & Operations | 48,457 | Aug 22, 2023 | 0 |
| Loose Christopher R. | Chief Scientific Officer | 183,650 | Jul 31, 2023 | 0 |
| LeBel Carl | Chief Development Officer | 26,343 | Jan 27, 2023 | 0 |
| Arnold Wendy S | Chief People Officer | 21,186 | Jan 27, 2023 | 0 |
| McCubbin Quentin | Chief Manufacturing Officer | 38,340 | Jan 27, 2023 | 0 |
| Barberich Timothy J | Director | – | Aug 19, 2022 | 0 |
| Marcus Joel S | Director | – | Aug 19, 2022 | 0 |
| Langer Robert | Director | – | Aug 19, 2022 | 0 |
| Feldmann Cynthia L | Director | – | Aug 19, 2022 | 0 |
| Huang Michael | Director | – | Aug 19, 2022 | 0 |
| Cohen Marc A | Director | – | Jun 23, 2022 | 0 |
| Pfreundschuh Peter P. | Chief Financial Officer | 8,927 | Feb 23, 2022 | 0 |
Insider trades
Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jun 17, 2026 (view filing) | Jun 16 | 1 day | Vincent Loic AChief Scientific Officer | SSale | −3.42K | $10.83 | −$37.0K | −15.7%18.3K after | |
| Jun 17, 2026 (view filing) | Jun 16 | 1 day | Chappell ToddChief Operating Officer | SSale | −3.17K | $10.83 | −$34.3K | −15.7%17.0K after | |
| Jun 24, 2026 (view filing) | Jun 22-24 | 2 days | Formela Jean FrancoisDirector | SSale | −171.4K | $14.34 | −$2.46M | −50.3%169.6K after | 8 lots10b5-1 |
| Jul 7, 2026 (view filing)6:04 PM ET | Jul 2-6 | 5 days | Formela Jean FrancoisDirector | SSale | −110.0K | $14.02 | −$1.54M | −42.9%146.3K after | 4 lots10b5-1 |
| Aug 5, 2026 (view filing)4:05 PM ET | Aug 4 | 1 day | Aiyar RamPresident and CEO | SSale | −5.80K | $10.84 | −$62.9K | −7.8%69.0K after | |
| Aug 13, 2026 (view filing)9:54 AM ET | Aug 6-10 | 7 daysLate | Nichols Weston and 1 other10% Owner | PPurchaseCommon stock, $0.001 par value per share | +6.68K | $11.79 | +$78.8K | +0.4%1.54M after | 2 lots |
| Aug 13, 2026 (view filing)5:04 PM ET | Aug 11 | 2 days | Formela Jean FrancoisDirector | SSale | −2.14K | $13.96 | −$29.9K | −1.4%145.9K after | 2 lots10b5-1 |
| Aug 21, 2026 (view filing)4:20 PM ET | Aug 19 | 2 days | Formela Jean FrancoisDirector | SSale | −28.5K | $14.00 | −$398.6K | −16.8%141.1K after | 2 lots10b5-1 |
| Aug 28, 2026 (view filing)4:30 PM ET | Aug 26 | 2 days | Formela Jean FrancoisDirector | SSale | −300 | $13.96 | −$4.19K | −0.2%141.0K after | 2 lots10b5-1 |
| Sep 10, 2026 (view filing)4:05 PM ET | Sep 8-9 | 2 days | Dolan OliverSenior Vice President, Finance | SSale | −7.35K | $13.51 | −$99.4K | −31.2%16.2K after | 2 lots10b5-1 |
| Sep 14, 2026 (view filing)4:05 PM ET | Sep 11 | 3 days | Dolan OliverSenior Vice President, Finance | SSale | −5 | $13.72 | −$68.58 | 0.0%16.2K after | 10b5-1 |
| Sep 15, 2026 (view filing)4:15 PM ET | Sep 11-14 | 4 days | Formela Jean FrancoisDirector | SSale | −48.7K | $14.09 | −$686.2K | −26.9%132.7K after | 4 lots10b5-1 |