New Positions
24 managers initiated
Top five by reported value
Korro Bio Inc NASDAQ NMS - GLOBAL MARKET:KRRO
Institutional holders, quarter-over-quarter share deltas, and new and closed positions disclosed in Form 13F. Period 2025-12-31 · prior 2025-09-30.
24 new25 added34 reduced30 exited
Total Institutional Holders
83
as of 2025-12-31
Top Holder
Atlas Venture Life Science Advisors, LLC
$9.1M
Largest QoQ Increase
Lynx1 Capital Management LP
+677,915 sh
Largest QoQ Decrease
DRIEHAUS CAPITAL MANAGEMENT LLC
-671,981 sh
New Positions(24)
Added To(25)
| Manager | Shares | Δ Shares | Value | Δ Value | % Δ |
|---|---|---|---|---|---|
| BlackRock, Inc. | 457,399 | +10,701 | $3.7M | -$17.7M | 2.4% |
| VANGUARD GROUP INC | 489,639 | +93,980 | $3.9M | -$15.0M | 23.8% |
| STATE STREET CORP | 146,221 | +21,652 | $1.2M | -$4.8M | 17.4% |
| CITADEL ADVISORS LLC | 352,029 | +198,101 | $2.8M | -$4.6M | 128.7% |
| TWO SIGMA INVESTMENTS, LP | 78,984 | +14,529 | $632.7K | -$2.5M | 22.5% |
| EMERALD MUTUAL FUND ADVISERS TRUST | 65,548 | +6,637 | $525.0K | -$2.3M | 11.3% |
| F/M Investments LLC | 65,548 | +10,303 | $525.0K | -$2.1M | 18.6% |
| RENAISSANCE TECHNOLOGIES LLC | 74,900 | +34,500 | $599.9K | -$1.3M | 85.4% |
| XTX Topco Ltd | 57,067 | +13,529 | $457.1K | +$457.1K | 31.1% |
| RHUMBLINE ADVISERS | 10,250 | +907 | $82.1K | -$365.3K | 9.7% |
| GOLDMAN SACHS GROUP INC | 51,950 | +36,269 | $416.1K | -$334.8K | 231.3% |
| AMERICAN CENTURY COMPANIES INC | 10,590 | +1,833 | $84.8K | -$334.5K | 20.9% |
| WELLS FARGO & COMPANY/MN | 7,522 | +2,352 | $60.3K | -$187.3K | 45.5% |
| BANK OF AMERICA CORP /DE/ | 5,896 | +1,192 | $47.2K | -$178.0K | 25.3% |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 3,146 | +8 | $25.2K | -$125.1K | 0.3% |
| DEUTSCHE BANK AG\ | 12,758 | +9,027 | $102.2K | -$76.5K | 241.9% |
| Quantinno Capital Management LP | 27,597 | +21,454 | $221.1K | -$73.1K | 349.2% |
| AlphaQuest LLC | 7,703 | +5,235 | $61.7K | -$56.5K | 212.1% |
| BNP PARIBAS ARBITRAGE, SNC | 1,487 | +173 | $11.9K | -$51.0K | 13.2% |
| Tower Research Capital LLC (TRC) | 1,391 | +353 | $11.1K | -$38.6K | 34.0% |
| Russell Investments Group, Ltd. | 1,930 | +1,115 | $15.5K | -$23.6K | 136.8% |
| CITIGROUP INC | 607 | +270 | $4.9K | -$11.3K | 80.1% |
| GAMMA Investing LLC | 102 | +13 | $817 | -$3.4K | 14.6% |
| ADVISOR GROUP HOLDINGS, INC. | 1,417 | +1,137 | $11.3K | -$635 | 406.1% |
| ALGERT GLOBAL LLC | 27,065 | +19,957 | $217 | -$123 | 280.8% |
Reduced(34)
Sold Out(30)
Top Holders by reported value
Ranked by the dollar value reported on the latest Form 13F. Share counts reflect long positions as of 2025-12-31.
| Manager | Shares | $ Value | Δ Shares | QoQ % |
|---|---|---|---|---|
| Atlas Venture Life Science Advisors, LLC | 1,137,149 | $9.1M | 0 | 0.0% |
| NEA Management Company, LLC | 1,090,793 | $8.7M | 0 | 0.0% |
| Lynx1 Capital Management LP | 677,915 | $5.4M | +677,915 | — |
| JANE STREET GROUP, LLC | 604,357 | $4.8M | +604,357 | — |
| Nantahala Capital Management, LLC | 600,000 | $4.8M | +600,000 | — |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 509,027 | $4.1M | +509,027 | — |
| VANGUARD GROUP INC | 489,639 | $3.9M | +93,980 | 23.8% |
| BlackRock, Inc. | 457,399 | $3.7M | +10,701 | 2.4% |
| TCG Crossover Management, LLC | 416,301 | $3.3M | 0 | 0.0% |
| CITADEL ADVISORS LLC | 352,029 | $2.8M | +198,101 | 128.7% |
| Siren, L.L.C. | 347,718 | $2.8M | -71,115 | -17.0% |
| 72 Investment Holdings, LLC | 276,831 | $2.2M | 0 | 0.0% |
| GEODE CAPITAL MANAGEMENT, LLC | 162,760 | $1.3M | -172 | -0.1% |
| MILLENNIUM MANAGEMENT LLC | 161,092 | $1.3M | -99,241 | -38.1% |
| STATE STREET CORP | 146,221 | $1.2M | +21,652 | 17.4% |
| TWO SIGMA INVESTMENTS, LP | 78,984 | $632.7K | +14,529 | 22.5% |
| RENAISSANCE TECHNOLOGIES LLC | 74,900 | $599.9K | +34,500 | 85.4% |
| MORGAN STANLEY | 69,728 | $558.5K | -97,766 | -58.4% |
| F/M Investments LLC | 65,548 | $525.0K | +10,303 | 18.6% |
| EMERALD MUTUAL FUND ADVISERS TRUST | 65,548 | $525.0K | +6,637 | 11.3% |
New & Closed Positions this quarter
Closed Positions
30 managers exited
Top five by prior-quarter value
Methodology
Form 13F is the SEC's quarterly disclosure for institutional investment managers exercising discretion over $100 million or more in qualifying U.S. equity securities. Managers must file within 45 days of each calendar quarter end, which is why holdings shown here reflect a snapshot at the period date — not real-time positioning.
Quarter-over-quarter deltas compare each manager's most recently reported share count for KRRO against its prior-quarter count. New positions are entries where the prior count was zero; closed positions are entries where the current count is zero. Amendments (13F-HR/A) replace prior filings for the same period.
Source: SEC EDGAR Form 13F (XML information tables). Dollar values are as reported by the manager and may use mid-quarter pricing conventions. CUSIP-to-ticker resolution is best-effort.