Who owns KYMR (KYMR)
Which tracked institutional funds hold KYMR, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See KYMR 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
92 tracked funds added or opened KYMR while 58 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
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
KYMR’s largest tracked holder by dollar value, FMR LLC, sizes it at 0.1% 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 KYMR 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 257 tracked filers holding KYMR, 138 increased or opened the position and 115 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 KYMR 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 16
- VANGUARD CAPITAL MANAGEMENT LLC$240M
- VANGUARD PORTFOLIO MANAGEMENT LLC$239M
- VANGUARD FIDUCIARY TRUST CO$36M
- Freestone Grove Partners LP$13M
- Connor, Clark & Lunn Investment Management Ltd.$9M
- FIFTH THIRD BANCORP$4M
Full exits 24
- VANGUARD GROUP INC$481M
- TWO SIGMA ADVISERS, LP$29M
- Point72 Asset Management, L.P.$13M
- Logos Global Management LP$10M
- PERCEPTIVE ADVISORS LLC$5M
- Verition Fund Management LLC$4M
Largest adds
- T. Rowe Price Investment Management, Inc.$448M
- FMR LLC$280M
- BAKER BROS. ADVISORS LP$47M
- Avoro Capital Advisors LLC$41M
- BVF INC/IL$30M
- UBS Group AG$28M
Largest trims
- BlackRock, Inc.$29M
- WELLINGTON MANAGEMENT GROUP LLP$20M
- FEDERATED HERMES, INC.$15M
- Squarepoint Ops LLC$11M
- BARCLAYS PLC$10M
- Deer Management Co. LLC$7M
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 |
|---|---|---|---|---|
| FMR LLC added | 11,698,810 | $974M | 11.5% | 2026-Q1 |
| BAKER BROS. ADVISORS LP | 8,657,242 | $721M | 8.5% | 2026-Q1 |
| Avoro Capital Advisors LLC | 7,474,747 | $623M | 7.4% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 6,060,847 | $505M | 6.0% | 2026-Q1 |
| BVF INC/IL | 5,502,710 | $458M | 5.4% | 2026-Q1 |
| T. Rowe Price Investment Management, Inc. added | 5,464,997 | $455M | 5.4% | 2026-Q1 |
| Atlas Venture Life Science Advisors, LLC trimmed | 4,578,008 | $381M | 4.5% | 2026-Q1 |
| BlackRock, Inc. trimmed | 4,321,403 | $360M | 4.3% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 3,880,963 | $323M | 3.8% | 2026-Q1 |
| Siren, L.L.C. trimmed | 3,186,830 | $265M | 3.1% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,880,324 | $240M | 2.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,874,056 | $239M | 2.8% | 2026-Q1 |
| STATE STREET CORP added | 2,389,767 | $199M | 2.4% | 2026-Q1 |
| Capital Research Global Investors added | 1,673,275 | $139M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,645,350 | $137M | 1.6% | 2026-Q1 |
| Driehaus Capital Management LLC trimmed | 1,043,583 | $87M | 1.0% | 2026-Q1 |
| UBS Group AG added | 1,023,852 | $85M | 1.0% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 888,409 | $74M | 0.9% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 875,872 | $73M | 0.9% | 2026-Q1 |
| Holocene Advisors, LP added | 836,759 | $70M | 0.8% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 888,035 | $69M | 0.8% | 2026-Q1 |
| Merck & Co., Inc. | 772,165 | $64M | 0.8% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 759,848 | $63M | 0.7% | 2026-Q1 |
| Commodore Capital LP | 750,000 | $62M | 0.7% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 626,925 | $52M | 0.6% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 592,879 | $49M | 0.6% | 2026-Q1 |
| DEERFIELD MANAGEMENT COMPANY, L.P. | 561,170 | $47M | 0.6% | 2026-Q1 |
| FEDERATED HERMES, INC. trimmed | 536,680 | $45M | 0.5% | 2026-Q1 |
| JENNISON ASSOCIATES LLC added | 508,999 | $42M | 0.5% | 2026-Q1 |
| Rock Springs Capital Management LP | 496,871 | $41M | 0.5% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 495,262 | $41M | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 494,439 | $41M | 0.5% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 468,728 | $39M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 427,382 | $36M | 0.4% | 2026-Q1 |
| Octagon Capital Advisors LP trimmed | 425,000 | $35M | 0.4% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 361,772 | $30M | 0.4% | 2026-Q1 |
| Alyeska Investment Group, L.P. trimmed | 342,698 | $29M | 0.3% | 2026-Q1 |
| BRAIDWELL LP trimmed | 337,559 | $28M | 0.3% | 2026-Q1 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. trimmed | 335,000 | $28M | 0.3% | 2026-Q1 |
| Boxer Capital Management, LLC | 329,100 | $27M | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 289,416 | $24M | 0.3% | 2026-Q1 |
| TD Asset Management Inc added | 287,100 | $24M | 0.3% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS added | 285,871 | $24M | 0.3% | 2026-Q1 |
| Nextech Invest, Ltd. | 278,896 | $23M | 0.3% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP trimmed | 256,501 | $21M | 0.3% | 2026-Q1 |
| First Turn Management, LLC added | 254,672 | $21M | 0.3% | 2026-Q1 |
| RTW INVESTMENTS, LP | 240,000 | $20M | 0.2% | 2026-Q1 |
| GILDER GAGNON HOWE & CO LLC trimmed | 235,433 | $20M | 0.2% | 2026-Q1 |
| Polar Capital Holdings Plc added | 215,200 | $18M | 0.2% | 2026-Q1 |
| MORGAN STANLEY trimmed | 212,702 | $18M | 0.2% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 209,005 | $17M | 0.2% | 2026-Q1 |
| Woodline Partners LP | 203,585 | $17M | 0.2% | 2026-Q1 |
| Candriam S.C.A. | 201,672 | $17M | 0.2% | 2026-Q1 |
| VOYA INVESTMENT MANAGEMENT LLC added | 198,808 | $17M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 193,200 | $16M | 0.2% | 2026-Q1 |
| TimesSquare Capital Management, LLC trimmed | 168,846 | $14M | 0.2% | 2026-Q1 |
| Freestone Grove Partners LP new | 156,763 | $13M | 0.2% | 2026-Q1 |
| Foresite Capital Management VI LLC | 146,332 | $12M | 0.1% | 2026-Q1 |
| Eagle Health Investments LP added | 145,816 | $12M | 0.1% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC added | 152,381 | $12M | 0.1% | 2026-Q1 |
| Nuveen, LLC added | 128,091 | $11M | 0.1% | 2026-Q1 |
| Deer Management Co. LLC trimmed | 125,895 | $10M | 0.1% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 120,151 | $10M | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 125,419 | $10M | 0.1% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 118,597 | $10M | 0.1% | 2026-Q1 |
| Ensign Peak Advisors, Inc added | 113,842 | $9M | 0.1% | 2026-Q1 |
| Connor, Clark & Lunn Investment Management Ltd. new | 104,279 | $9M | 0.1% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH trimmed | 103,200 | $9M | 0.1% | 2026-Q1 |
| Patient Square Capital LP trimmed | 100,000 | $8M | 0.1% | 2026-Q1 |
| Swiss National Bank added | 94,500 | $8M | 0.1% | 2026-Q1 |
| FIRST TRUST ADVISORS LP added | 93,617 | $8M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 91,882 | $8M | 0.1% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC added | 83,876 | $7M | 0.1% | 2026-Q1 |
| Invesco Ltd. trimmed | 77,920 | $6M | 0.1% | 2026-Q1 |
| Burkehill Global Management, LP | 75,000 | $6M | 0.1% | 2026-Q1 |
| Yiheng Capital Management, L.P. | 73,440 | $6M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 71,678 | $6M | 0.1% | 2026-Q1 |
| NEUBERGER BERMAN GROUP LLC added | 71,116 | $6M | 0.1% | 2026-Q1 |
| VICTORY CAPITAL MANAGEMENT INC added | 67,995 | $6M | 0.1% | 2026-Q1 |
| ALPS ADVISORS INC added | 66,457 | $6M | 0.1% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 64,467 | $5M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 56,282 | $5M | 0.1% | 2026-Q1 |
| Rafferty Asset Management, LLC trimmed | 55,331 | $5M | 0.1% | 2026-Q1 |
| FIFTH THIRD BANCORP new | 51,238 | $4M | 0.1% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 48,812 | $4M | 0.0% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 44,990 | $4M | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 6,185,965 | $481M | 5.7% | 2025-Q4 stale |
| Redmile Group, LLC trimmed | 803,289 | $35M | 0.4% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP added | 373,800 | $29M | 0.3% | 2025-Q4 stale |
| Point72 Asset Management, L.P. trimmed | 173,147 | $13M | 0.2% | 2025-Q4 stale |
| SUVRETTA CAPITAL MANAGEMENT, LLC added | 275,000 | $12M | 0.1% | 2025-Q2 stale |
| Logos Global Management LP trimmed | 130,000 | $10M | 0.1% | 2025-Q4 stale |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC added | 162,315 | $7M | 0.1% | 2025-Q2 stale |
| PERCEPTIVE ADVISORS LLC trimmed | 69,935 | $5M | 0.1% | 2025-Q4 stale |
| Atika Capital Management LLC trimmed | 81,300 | $5M | 0.1% | 2025-Q3 stale |
| AXA Investment Managers S.A. new | 80,534 | $5M | 0.1% | 2025-Q3 stale |
| Verition Fund Management LLC added | 54,319 | $4M | 0.1% | 2025-Q4 stale |
| AXA S.A. trimmed | 90,971 | $4M | 0.0% | 2025-Q2 stale |
| COMERICA BANK trimmed | 49,812 | $4M | 0.0% | 2025-Q4 stale |
| Aquilo Capital Management, LLC trimmed | 138,521 | $4M | 0.0% | 2025-Q1 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.