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.
13F holders, Q4 2025
Institutional positions in Korro Bio, Inc. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 83
- −8 vs. Q3 2025
- Shares held
- 7.56M
- −1.83M (−19.5%) vs. Q3 2025
- Total value
- $60.6M
- −$387.3M (−86.5%) vs. Q3 2025
- New holders
- 22
- 24 more added
- Sold out
- 30
- 22 more reduced
1 institution that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting KRRO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 106 | $190.1M |
| Q1 2026 | 99 | $144.8M |
| Q4 2025 | 83 | $60.6M |
| Q3 2025 | 92 | $465.5M |
| Q2 2025 | 71 | $114.8M |
| Q1 2025 | 75 | $169.0M |
| Q4 2024 | 84 | $359.6M |
| Q3 2024 | 71 | $285.3M |
| Q2 2024 | 64 | $285.7M |
| Q1 2024 | 49 | $618.6M |
| Q4 2023 | 40 | $301.5M |
| Q3 2023 | 42 | $2.58M |
| Q2 2023 | 41 | $1.67M |
| Q1 2023 | 43 | $2.52M |
| Q4 2022 | 50 | $28.3M |
| Q3 2022 | 55 | $14.1M |
| Q2 2022 | 58 | $13.0M |
| Q1 2022 | 86 | $33.1M |
| Q4 2021 | 84 | $90.2M |
| Q3 2021 | 88 | $130.4M |
| Q2 2021 | 91 | $193.9M |
| Q1 2021 | 115 | $186.6M |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Korro Bio, Inc.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Atlas Venture Life Science Advisors, LLC | 1,137,149 | $9.11M | 1.05% | 00.0% | Unchanged |
| NEA Management Company, LLC | 1,090,793 | $8.74M | 0.45% | 00.0% | Unchanged |
| Lynx1 Capital Management LP | 677,915 | $5.43M | 1.10% | +677,915 | New |
| Nantahala Capital Management, LLC | 600,000 | $4.81M | 0.29% | +600,000 | New |
| Vanguard Group Inc | 489,639 | $3.92M | 0.00% | +93,980+23.8% | Added |
| BlackRock, Inc. | 457,399 | $3.66M | 0.00% | +10,701+2.4% | Added |
| TCG Crossover Management, LLC | 416,301 | $3.33M | 0.11% | 00.0% | Unchanged |
| Siren, L.L.C. | 347,718 | $2.79M | 0.08% | −71,115−17.0% | Reduced |
| Jane Street Group, LLC | 288,457 | $2.31M | 0.00% | +288,457 | New |
| 72 Investment Holdings, LLC | 276,831 | $2.22M | 4.38% | 00.0% | Unchanged |
| Susquehanna International Group, LLP | 196,827 | $1.58M | 0.00% | +196,827 | New |
| Geode Capital Management, LLC | 162,760 | $1.30M | 0.00% | −172−0.1% | Reduced |
| Millennium Management LLC | 161,092 | $1.29M | 0.00% | −99,241−38.1% | Reduced |
| State Street Corp | 146,221 | $1.17M | 0.00% | +21,652+17.4% | Added |
| Two Sigma Investments, LP | 78,984 | $632.7K | 0.00% | +14,529+22.5% | Added |
| Renaissance Technologies LLC | 74,900 | $599.9K | 0.00% | +34,500+85.4% | Added |
| Morgan Stanley | 69,728 | $558.5K | 0.00% | −97,766−58.4% | Reduced |
| Emerald Mutual Fund Advisers Trust | 65,548 | $525.0K | 0.03% | +6,637+11.3% | Added |
| F/M Investments LLC | 65,548 | $525.0K | 0.02% | +10,303+18.6% | Added |
| Citadel Advisors LLC | 58,329 | $467.2K | 0.00% | −95,599−62.1% | Reduced |
| XTX Topco Ltd | 57,067 | $457.1K | 0.01% | +13,529+31.1% | Added |
| Northern Trust Corp | 55,640 | $445.7K | 0.00% | −1,633−2.9% | Reduced |
| Goldman Sachs Group Inc | 51,950 | $416.1K | 0.00% | +36,269+231.3% | Added |
| Graham Capital Management, L.P. | 40,766 | $326.5K | 0.01% | +40,766 | New |
| AQR Capital Management LLC | 40,647 | $325.6K | 0.00% | −7,760−16.0% | Reduced |
| FMR LLC | 37,857 | $303.2K | 0.00% | −525,824−93.3% | Reduced |
| Acadian Asset Management LLC | 33,790 | $270.0K | 0.00% | +33,790 | New |
| AIHC Capital Management Ltd | 30,265 | $242.4K | 0.23% | +30,265 | New |
| Simplex Trading, LLC | 28,247 | $226.3K | 0.01% | +28,247 | New |
| Quantinno Capital Management LP | 27,597 | $221.1K | 0.00% | +21,454+349.2% | Added |
| Algert Global LLC | 27,065 | $216.8K | 0.00% | +19,957+280.8% | Added |
| Quadrature Capital Ltd | 27,064 | $216.8K | 0.00% | +27,064 | New |
| Engineers Gate Manager LP | 26,885 | $215.3K | 0.00% | +26,885 | New |
| Raymond James Financial Inc | 23,031 | $184.5K | 0.00% | −125,940−84.5% | Reduced |
| UBS Group AG | 19,995 | $160.2K | 0.00% | −33,108−62.3% | Reduced |
| Marshall Wace, LLP | 19,772 | $158.4K | 0.00% | +19,772 | New |
| Bank of New York Mellon Corp | 18,855 | $151.0K | 0.00% | −458−2.4% | Reduced |
| Charles Schwab Investment Management Inc | 16,329 | $130.8K | 0.00% | −6,772−29.3% | Reduced |
| Deutsche Bank AG | 12,758 | $102.2K | 0.00% | +9,027+241.9% | Added |
| Two Sigma Advisers, LP | 11,237 | $90.0K | 0.00% | −172−1.5% | Reduced |
| American Century Companies Inc | 10,590 | $84.8K | 0.00% | +1,833+20.9% | Added |
| Jain Global LLC | 10,574 | $84.7K | 0.00% | +10,574 | New |
| Guggenheim Capital LLC | 10,439 | $83.6K | 0.00% | +10,439 | New |
| Rhumbline Advisers | 10,250 | $82.1K | 0.00% | +907+9.7% | Added |
| Quest Partners LLC | 7,703 | $61.7K | 0.00% | +5,235+212.1% | Added |
| Wells Fargo & Company | 7,522 | $60.3K | 0.00% | +2,352+45.5% | Added |
| Bank of America Corp | 5,896 | $47.2K | 0.00% | +1,192+25.3% | Added |
| Group One Trading, L.P. | 4,000 | $32.0K | 0.00% | +4,000 | New |
| Mirae Asset Global ETFs Holdings Ltd. | 3,146 | $25.2K | 0.00% | +8+0.3% | Added |
| New York State Common Retirement Fund | 3,000 | $24.0K | 0.00% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 2,838 | $22.7K | 0.00% | −196,411−98.6% | Reduced |
| Russell Investments Group, Ltd. | 1,930 | $15.5K | 0.00% | +1,115+136.8% | Added |
| North Star Investment Management Corp. | 1,800 | $14.4K | 0.00% | 00.0% | Unchanged |
| Steward Partners Investment Advisory, LLC | 1,500 | $12.0K | 0.00% | −250−14.3% | Reduced |
| BNP Paribas Arbitrage, SA | 1,487 | $11.9K | 0.00% | +173+13.2% | Added |
| Advisor Group Holdings, Inc. | 1,417 | $11.3K | 0.00% | +1,137+406.1% | Added |
| Tower Research Capital LLC (TRC) | 1,391 | $11.1K | 0.00% | +353+34.0% | Added |
| Police & Firemen's Retirement System of New Jersey | 1,373 | $11.0K | 0.00% | −913−39.9% | Reduced |
| TD Waterhouse Canada Inc. | 800 | $6.40K | 0.00% | +800 | New |
| The PNC Financial Services Group, Inc. | 740 | $5.93K | 0.00% | −2,174−74.6% | Reduced |
| Citigroup Inc | 607 | $4.86K | 0.00% | +270+80.1% | Added |
| Ameritas Investment Partners, Inc. | 598 | $4.79K | 0.00% | 00.0% | Unchanged |
| Legal & General Group Plc | 526 | $4.21K | 0.00% | 00.0% | Unchanged |
| Sterling Capital Management LLC | 458 | $3.67K | 0.00% | 00.0% | Unchanged |
| Duncker Streett & Co Inc | 437 | $3.50K | 0.00% | 00.0% | Unchanged |
| California State Teachers Retirement System | 408 | $3.27K | 0.00% | −8−1.9% | Reduced |
| Federated Hermes, Inc. | 302 | $2.42K | 0.00% | +302 | New |
| Royal Bank of Canada | 224 | $2.00K | 0.00% | −5,768−96.3% | Reduced |
| CWM, LLC | 288 | $2.00K | 0.00% | −2,405−89.3% | Reduced |
| Amalgamated Bank | 208 | $2.00K | 0.00% | −3−1.4% | Reduced |
| Optiver Holding B.V. | 116 | $929 | 0.00% | 00.0% | Unchanged |
| GAMMA Investing LLC | 102 | $817 | 0.00% | +13+14.6% | Added |
| UBS Asset Management Americas Inc | 91 | $729 | 0.00% | +91 | New |
| Keating Financial Advisory Services, Inc. | 63 | $505 | 0.00% | +63 | New |
| IFP Advisors, Inc | 40 | $320 | 0.00% | 00.0% | Unchanged |
| Global Retirement Partners, LLC | 35 | $280 | 0.00% | +35 | New |
| Rothschild Investment LLC | 6 | $48 | 0.00% | +6 | New |
| MAI Capital Management | 5 | $41 | 0.00% | 00.0% | Unchanged |
| Northwestern Mutual Wealth Management Co | 2 | $16 | 0.00% | 00.0% | Unchanged |
| Allworth Financial LP | 1 | $9 | 0.00% | −91−98.9% | Reduced |
| SBI Securities Co., Ltd. | 1 | $8 | 0.00% | 00.0% | Unchanged |
| Sunbelt Securities, Inc. | 1 | $8 | 0.00% | +1 | New |
| Los Angeles Capital Management LLC | 110 | – | – | +110 | New |
| Driehaus Capital Management LLC | 0 | $0 | 0.00% | −671,981−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −531,969−100.0% | Sold out |
| Cormorant Asset Management, LP | 0 | $0 | 0.00% | −465,000−100.0% | Sold out |
| Tri Locum Partners LP | 0 | $0 | 0.00% | −337,764−100.0% | Sold out |
| Polar Capital Holdings Plc | 0 | $0 | 0.00% | −264,694−100.0% | Sold out |
| Blue Owl Capital Holdings LP | 0 | $0 | 0.00% | −105,000−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −90,186−100.0% | Sold out |
| DAFNA Capital Management LLC | 0 | $0 | 0.00% | −60,804−100.0% | Sold out |
| Standard Life Aberdeen plc | 0 | $0 | 0.00% | −57,983−100.0% | Sold out |
| Woodline Partners LP | 0 | $0 | 0.00% | −50,094−100.0% | Sold out |
| ADAR1 Capital Management, LLC | 0 | $0 | 0.00% | −40,235−100.0% | Sold out |
| Trexquant Investment LP | 0 | $0 | 0.00% | −38,260−100.0% | Sold out |
| Rock Springs Capital Management LP | 0 | $0 | 0.00% | −35,719−100.0% | Sold out |
| OrbiMed Advisors LLC | 0 | $0 | 0.00% | −32,400−100.0% | Sold out |
| Eversept Partners, LP | 0 | $0 | 0.00% | −20,856−100.0% | Sold out |
| Emerald Advisers, LLC | 0 | $0 | 0.00% | −16,469−100.0% | Sold out |
| Blair William & Co | 0 | $0 | 0.00% | −9,750−100.0% | Sold out |