Korro Bio, Inc. (KRRO) Insider Trading
Over the last 3 months, KRRO insiders made 2 open-market buys and 23 sales, a net sale of -$4.6M (SEC Form 4). Over the last 6 months, 80 institutions increased and 42 reduced their position (13F).
Insider Activity
Sentiment
1/100
Buys (3m)
2
Sells (3m)
23
Net (3m)
-$4.6M
Insiders buying
Insider trades by month Buys Sells
Nov
Mar
Apr
Jun
Jul
Aug
Context3-month price -2.2%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 28, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 51 | $13.96 |
| Aug 28, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 249 | $13.96 |
| Aug 21, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 23,584 | $14.00 |
| Aug 21, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 4,884 | $14.00 |
| Aug 13, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 1,775 | $13.96 |
| Aug 13, 2026 | Lynx1 Capital Management LP10 percent owner | Buy | 1,462 | $13.19 |
| Aug 13, 2026 | Lynx1 Capital Management LP10 percent owner | Buy | 5,222 | $11.40 |
| Aug 13, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 368 | $13.96 |
| Aug 5, 2026 | Aiyar Ramdirector, officer: President and CEO | Sell | 5,802 | $10.84 |
| Jul 17, 2026 | Dolan Oliverofficer: Senior Vice President, Finance | Grant | 5,500 | — |
| Jul 17, 2026 | Chappell Toddofficer: Chief Operating Officer | Grant | 7,500 | — |
| Jul 17, 2026 | Cerio Jeffreyofficer: General Counsel | Grant | 6,500 | — |
| Jul 17, 2026 | Vincent Loic Aofficer: Chief Scientific Officer | Grant | 7,500 | — |
| Jul 7, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 14,745 | $14.03 |
| Jul 7, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 8,506 | $13.96 |
| Jul 7, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 817 | $13.96 |
| Jul 7, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 85,955 | $14.03 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 580 | $13.95 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 114 | $14.98 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 6,979 | $14.60 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 666 | $14.98 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 40,679 | $14.60 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 17,426 | $14.25 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 101,579 | $14.25 |
| Jun 24, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 3,382 | $13.95 |
| Jun 17, 2026 | Vincent Loic Aofficer: Chief Scientific Officer | Sell | 3,418 | $10.83 |
| Jun 17, 2026 | Dolan Oliverofficer: Senior Vice President, Finance | Sell | 3,383 | $10.83 |
| Jun 17, 2026 | Cerio Jeffreyofficer: General Counsel | Sell | 6,609 | $10.83 |
| Jun 17, 2026 | Chappell Toddofficer: Chief Operating Officer | Sell | 3,168 | $10.83 |
| Jun 11, 2026 | Behbahani Alidirector | Grant | 14,677 | $10.59 |
Source: KRRO SEC Form 4 filings, latest Aug 28, 2026. For informational purposes only — not investment advice.
Institutional activity (13F)
How institutions changed their KRRO positions over the last 6 months (SEC Form 13F).
Increased
80
New positions
54
Reduced
42
Sold out
11
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| Lynx1 Capital Management LP | Unchanged | 1.5M | Aug 13, 2026 |
| LYNX1 CAPITAL MANAGEMENT LP | Increased | 1.5M | May 4, 2026 |
| NEA Management Company, LLC | Unchanged | 1.3M | Aug 14, 2026 |
| NEA MANAGEMENT COMPANY, LLC | Increased | 1.3M | May 15, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 1.1M | May 14, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | New Position | 1.0M | May 15, 2026 |
| VR ADVISER, LLC | New Position | 1.0M | May 15, 2026 |
| VR Adviser, LLC | Unchanged | 1.0M | Aug 14, 2026 |
| Atlas Venture Life Science Advisors, LLC | Reduced | 963K | Aug 13, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | Reduced | 952K | Aug 14, 2026 |
| BlackRock, Inc. | Increased | 818K | Aug 7, 2026 |
| Affinity Asset Advisors, LLC | Unchanged | 707K | Aug 13, 2026 |
| AFFINITY ASSET ADVISORS, LLC | New Position | 707K | May 14, 2026 |
| NANTAHALA CAPITAL MANAGEMENT, LLC | Increased | 660K | May 15, 2026 |
| Nantahala Capital Management, LLC | Unchanged | 660K | Aug 19, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.