Korro Bio, Inc. (KRRO) Insider Trading
Over the last 3 months, KRRO insiders made 19 open-market buys and 3 sales, a net purchase of $20.5M (SEC Form 4). Multiple insiders bought within days of each other (cluster buying). Over the last 6 months, 66 institutions increased and 42 reduced their position (13F).
Insider Activity
Sentiment
98/100
Buys (3m)
19
Sells (3m)
3
Net (3m)
$20.5M
Insiders buyingCluster buying
Insider trades by month Buys Sells
Apr
Oct
Nov
Mar
Apr
Jun
Context3-month price -0.6%Institutions accumulating (13F)
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Jun 2, 2026 | Aiyar Ramdirector, officer: President and CEO | Sell | 15,152 | $12.98 |
| Jun 1, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 2,441 | $13.95 |
| Jun 1, 2026 | FORMELA JEAN FRANCOISdirector | Sell | 419 | $13.95 |
| May 28, 2026 | Aiyar Ramdirector, officer: President and CEO | Grant | 50,000 | $12.33 |
| Apr 2, 2026 | Lynx1 Capital Management LP10 percent owner | Buy | 520 | $10.60 |
| Mar 12, 2026 | Yang Rick10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | Chang Carmen10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | New Enterprise Associates 17, L.P.10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | SANDELL SCOTT D10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | SANDELL SCOTT D10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | Yang Rick10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | Makhzoumi Mohamad10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | Makhzoumi Mohamad10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | Mathers Edward T10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | Mathers Edward T10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | BASKETT FOREST10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | BASKETT FOREST10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | Behbahani Alidirector, 10 percent owner: | Grant | 242,945 | $0.00 |
| Mar 12, 2026 | Behbahani Alidirector, 10 percent owner: | Grant | 207,100 | $11.11 |
| Mar 12, 2026 | Chang Carmen10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | New Enterprise Associates 17, L.P.10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | Florence Anthony A. Jr.10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | Florence Anthony A. Jr.10 percent owner | Buy | 207,100 | $11.11 |
| Mar 12, 2026 | Walker Paul Edward10 percent owner | Buy | 242,945 | $0.00 |
| Mar 12, 2026 | Walker Paul Edward10 percent owner | Buy | 207,100 | $11.11 |
| Feb 3, 2026 | Aiyar Ramdirector, officer: President and CEO | Grant | 40,000 | — |
| Feb 3, 2026 | Vincent Loic Aofficer: Chief Scientific Officer | Grant | 35,000 | $13.05 |
| Feb 3, 2026 | Dolan Oliverofficer: Senior Vice President, Finance | Grant | 15,000 | $13.05 |
| Feb 3, 2026 | Cerio Jeffreyofficer: General Counsel | Grant | 23,000 | $13.05 |
| Feb 3, 2026 | Chappell Toddofficer: Chief Operating Officer | Grant | 38,000 | $13.05 |
Source: KRRO SEC Form 4 filings, latest Jun 2, 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
66
New positions
48
Reduced
42
Sold out
41
Largest moves
| Institution | Action | Shares | Filed |
|---|---|---|---|
| LYNX1 CAPITAL MANAGEMENT LP | Increased | 1.5M | May 4, 2026 |
| NEA MANAGEMENT COMPANY, LLC | Increased | 1.3M | May 15, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 1.1M | May 14, 2026 |
| ATLAS VENTURE LIFE SCIENCE ADVISORS, LLC | Unchanged | 1.1M | Feb 13, 2026 |
| NEA MANAGEMENT COMPANY, LLC | Unchanged | 1.1M | Feb 17, 2026 |
| BALYASNY ASSET MANAGEMENT L.P. | New Position | 1.0M | May 15, 2026 |
| VR ADVISER, LLC | New Position | 1.0M | May 15, 2026 |
| AFFINITY ASSET ADVISORS, LLC | New Position | 707K | May 14, 2026 |
| LYNX1 CAPITAL MANAGEMENT LP | New Position | 678K | Feb 17, 2026 |
| NANTAHALA CAPITAL MANAGEMENT, LLC | Increased | 660K | May 15, 2026 |
| NANTAHALA CAPITAL MANAGEMENT, LLC | New Position | 600K | Feb 13, 2026 |
| ADAR1 CAPITAL MANAGEMENT, LLC | Increased | 540K | May 18, 2026 |
| VANGUARD GROUP INC | Increased | 490K | Jan 29, 2026 |
| BLACKROCK, INC. | Increased | 460K | May 13, 2026 |
| BLACKROCK, INC. | Increased | 457K | Feb 12, 2026 |
Source: SEC Form 13F filings. For informational purposes only — not investment advice.