Who owns KRRO (KRRO)
Which tracked institutional funds hold KRRO, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See KRRO company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on KRRO is one-sided between 2025-Q4 and 2026-Q1: 25 added or opened and 5 trimmed or exited — on balance accumulating.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
KRRO’s largest tracked holder by dollar value, Point72 Asset Management, L.P., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in KRRO divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 98 tracked filers holding KRRO, 65 increased or opened the position and 37 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in KRRO between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 10
- BALYASNY ASSET MANAGEMENT L.P.$12M
- Venrock Adviser, LLC$11M
- Affinity Asset Advisors, LLC$8M
- ADAR1 Capital Management, LLC$6M
- Driehaus Capital Management LLC$5M
- VANGUARD CAPITAL MANAGEMENT LLC$4M
Full exits 3
- VANGUARD GROUP INC$4M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP$2M
- NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO$1M
Largest adds
- Lynx1 Capital Management LP$12M
- NEA Management Company, LLC$6M
- Atlas Venture Life Science Advisors, LLC$4M
- Nantahala Capital Management, LLC$3M
- AQR CAPITAL MANAGEMENT LLC$3M
- BlackRock, Inc.$2M
Largest trims
- JANE STREET GROUP, LLC$1M
- MILLENNIUM MANAGEMENT LLC$570K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Lynx1 Capital Management LP added | 1,538,296 | $17M | 6.3% | 2026-Q1 |
| NEA Management Company, LLC added | 1,297,893 | $15M | 5.3% | 2026-Q1 |
| Atlas Venture Life Science Advisors, LLC | 1,137,149 | $13M | 4.6% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,040,054 | $12M | 4.2% | 2026-Q1 |
| Venrock Adviser, LLC new | 1,009,500 | $11M | 4.1% | 2026-Q1 |
| Affinity Asset Advisors, LLC new | 706,904 | $8M | 2.9% | 2026-Q1 |
| Nantahala Capital Management, LLC added | 660,036 | $7M | 2.7% | 2026-Q1 |
| ADAR1 Capital Management, LLC added | 540,054 | $6M | 2.2% | 2026-Q1 |
| BlackRock, Inc. added | 460,006 | $5M | 1.9% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 450,045 | $5M | 1.8% | 2026-Q1 |
| TCG Crossover Management, LLC | 416,301 | $5M | 1.7% | 2026-Q1 |
| Siren, L.L.C. | 347,718 | $4M | 1.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 310,913 | $4M | 1.3% | 2026-Q1 |
| 72 Investment Holdings, LLC | 276,831 | $3M | 1.1% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 261,547 | $3M | 1.1% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 228,400 | $3M | 0.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 173,643 | $2M | 0.7% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 165,472 | $2M | 0.7% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 148,559 | $2M | 0.6% | 2026-Q1 |
| STATE STREET CORP trimmed | 140,341 | $2M | 0.6% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 136,227 | $2M | 0.6% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 115,704 | $1M | 0.5% | 2026-Q1 |
| Kalehua Capital Management LLC new | 109,376 | $1M | 0.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 63,606 | $720K | 0.3% | 2026-Q1 |
| F/m Investments LLC trimmed | 62,855 | $712K | 0.3% | 2026-Q1 |
| EMERALD MUTUAL FUND ADVISERS TRUST trimmed | 62,855 | $712K | 0.3% | 2026-Q1 |
| JPMORGAN CHASE & CO added | 68,500 | $704K | 0.3% | 2026-Q1 |
| XTX Topco Ltd added | 60,472 | $685K | 0.2% | 2026-Q1 |
| NORTHERN TRUST CORP added | 57,702 | $653K | 0.2% | 2026-Q1 |
| Trexquant Investment LP added | 56,208 | $636K | 0.2% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 50,541 | $572K | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC added | 42,838 | $485K | 0.2% | 2026-Q1 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 42,000 | $475K | 0.2% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 41,825 | $471K | 0.2% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 41,541 | $470K | 0.2% | 2026-Q1 |
| MORGAN STANLEY trimmed | 41,123 | $466K | 0.2% | 2026-Q1 |
| FMR LLC added | 38,900 | $440K | 0.2% | 2026-Q1 |
| Quantinno Capital Management LP added | 35,978 | $407K | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 30,914 | $350K | 0.1% | 2026-Q1 |
| MARSHALL WACE, LLP added | 30,336 | $343K | 0.1% | 2026-Q1 |
| AIHC Capital Management Ltd | 30,265 | $343K | 0.1% | 2026-Q1 |
| Mariner, LLC new | 25,819 | $292K | 0.1% | 2026-Q1 |
| Engineers Gate Manager LP trimmed | 23,702 | $268K | 0.1% | 2026-Q1 |
| Bank of New York Mellon Corp added | 21,730 | $246K | 0.1% | 2026-Q1 |
| UBS Group AG added | 21,676 | $245K | 0.1% | 2026-Q1 |
| Quadrature Capital Ltd trimmed | 20,356 | $230K | 0.1% | 2026-Q1 |
| ALGERT GLOBAL LLC trimmed | 19,185 | $217K | 0.1% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC new | 19,125 | $216K | 0.1% | 2026-Q1 |
| GUGGENHEIM CAPITAL LLC added | 14,097 | $160K | 0.1% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 13,394 | $152K | 0.1% | 2026-Q1 |
| IEQ CAPITAL, LLC new | 12,777 | $145K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP added | 10,790 | $122K | 0.0% | 2026-Q1 |
| DEUTSCHE BANK AG\ trimmed | 10,544 | $119K | 0.0% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 9,850 | $111K | 0.0% | 2026-Q1 |
| CWM, LLC added | 9,772 | $111K | 0.0% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 3,214 | $36K | 0.0% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 3,000 | $34K | 0.0% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 2,589 | $29K | 0.0% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 2,354 | $27K | 0.0% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 2,115 | $24K | 0.0% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 1,929 | $22K | 0.0% | 2026-Q1 |
| North Star Investment Management Corp. | 1,800 | $20K | 0.0% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 531,969 | $25M | 9.1% | 2025-Q3 stale |
| Cormorant Asset Management, LP | 465,000 | $22M | 8.0% | 2025-Q3 stale |
| QIMING U.S. VENTURES MANAGEMENT, LLC | 368,085 | $18M | 6.3% | 2025-Q3 stale |
| Tri Locum Partners LP added | 337,764 | $16M | 5.8% | 2025-Q3 stale |
| Polar Capital Holdings Plc added | 264,694 | $13M | 4.6% | 2025-Q3 stale |
| Blue Owl Capital Holdings LP trimmed | 105,000 | $5M | 1.8% | 2025-Q3 stale |
| Schonfeld Strategic Advisors LLC added | 90,186 | $4M | 1.6% | 2025-Q3 stale |
| VANGUARD GROUP INC added | 489,639 | $4M | 1.4% | 2025-Q4 stale |
| Deep Track Capital, LP trimmed | 277,966 | $3M | 1.2% | 2025-Q2 stale |
| DAFNA Capital Management LLC added | 60,804 | $3M | 1.0% | 2025-Q3 stale |
| Aberdeen Group plc trimmed | 57,983 | $3M | 1.0% | 2025-Q3 stale |
| Woodline Partners LP | 50,094 | $2M | 0.9% | 2025-Q3 stale |
| Ally Bridge Group (NY) LLC added | 154,223 | $2M | 0.7% | 2025-Q2 stale |
| Rock Springs Capital Management LP | 35,719 | $2M | 0.6% | 2025-Q3 stale |
| FRANKLIN RESOURCES INC trimmed | 91,704 | $2M | 0.6% | 2025-Q1 stale |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 196,827 | $2M | 0.6% | 2025-Q4 stale |
| ORBIMED ADVISORS LLC | 32,400 | $2M | 0.6% | 2025-Q3 stale |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO added | 4,320 | $1M | 0.4% | 2025-Q4 stale |
| Eversept Partners, LP trimmed | 20,856 | $999K | 0.4% | 2025-Q3 stale |
| EMERALD ADVISERS, LLC new | 16,469 | $789K | 0.3% | 2025-Q3 stale |
| BLAIR WILLIAM & CO/IL trimmed | 9,750 | $467K | 0.2% | 2025-Q3 stale |
| Nuveen, LLC trimmed | 9,264 | $444K | 0.2% | 2025-Q3 stale |
| ALLIANCEBERNSTEIN L.P. trimmed | 7,700 | $369K | 0.1% | 2025-Q3 stale |
| Graham Capital Management, L.P. new | 40,766 | $327K | 0.1% | 2025-Q4 stale |
| D. E. Shaw & Co., Inc. added | 24,383 | $305K | 0.1% | 2025-Q2 stale |
| Wealth Forward, LLC new | 5,009 | $240K | 0.1% | 2025-Q3 stale |
| SIMPLEX TRADING, LLC trimmed | 28,247 | $226K | 0.1% | 2025-Q4 stale |
| Quarry LP trimmed | 4,375 | $210K | 0.1% | 2025-Q3 stale |
| Walleye Capital LLC trimmed | 16,060 | $201K | 0.1% | 2025-Q2 stale |
| MetLife Investment Management, LLC added | 3,945 | $189K | 0.1% | 2025-Q3 stale |
| BARCLAYS PLC trimmed | 7,241 | $126K | 0.0% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP trimmed | 11,237 | $90K | 0.0% | 2025-Q4 stale |
| AMERICAN CENTURY COMPANIES INC added | 10,590 | $85K | 0.0% | 2025-Q4 stale |
| Jain Global LLC new | 10,574 | $85K | 0.0% | 2025-Q4 stale |
| AlphaQuest LLC added | 7,703 | $62K | 0.0% | 2025-Q4 stale |
| Corebridge Financial, Inc. trimmed | 3,019 | $53K | 0.0% | 2025-Q1 stale |
| BANK OF AMERICA CORP /DE/ added | 5,896 | $47K | 0.0% | 2025-Q4 stale |
| GROUP ONE TRADING LLC added | 4,000 | $32K | 0.0% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.