Who owns LEGN
Which tracked institutional funds hold LEGN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See LEGN 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
36 tracked funds added or opened LEGN while 72 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
LEGN’s largest tracked holder by dollar value, FMR LLC, 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 LEGN 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 190 tracked filers holding LEGN, 113 increased or opened the position and 92 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 LEGN 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 12
- First Beijing Investment Ltd$42M
- Kynam Capital Management, LP$29M
- Patient Square Capital LP$18M
- Y-Intercept (Hong Kong) Ltd$4M
- XTX Topco Ltd$4M
- Trexquant Investment LP$3M
Full exits 22
- ALLIANCEBERNSTEIN L.P.$33M
- BRAIDWELL LP$28M
- TWO SIGMA ADVISERS, LP$15M
- Eagle Health Investments LP$9M
- Balyasny Asset Management L.P.$7M
- JANE STREET GROUP, LLC$5M
Largest adds
- TWO SIGMA INVESTMENTS, LP$23M
- ACADIAN ASSET MANAGEMENT LLC$15M
- DEERFIELD MANAGEMENT COMPANY, L.P.$10M
- Point72 Asset Management, L.P.$10M
- Triata Capital Ltd$6M
- CITADEL ADVISORS LLC$5M
Largest trims
- FMR LLC$77M
- WESTFIELD CAPITAL MANAGEMENT CO LP$30M
- HHLR ADVISORS, LTD.$22M
- GOLDMAN SACHS GROUP INC$21M
- JPMORGAN CHASE & CO$16M
- MARSHALL WACE, LLP$11M
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 | 24,921,230 | $451M | 21.5% | 2026-Q1 |
| DEERFIELD MANAGEMENT COMPANY, L.P. added | 7,687,638 | $139M | 6.6% | 2026-Q1 |
| SUVRETTA CAPITAL MANAGEMENT, LLC added | 7,581,029 | $137M | 6.5% | 2026-Q1 |
| HHLR ADVISORS, LTD. | 5,984,550 | $108M | 5.2% | 2026-Q1 |
| WESTFIELD CAPITAL MANAGEMENT CO LP trimmed | 5,763,475 | $104M | 5.0% | 2026-Q1 |
| BlackRock, Inc. added | 4,684,543 | $85M | 4.0% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 3,886,017 | $70M | 3.4% | 2026-Q1 |
| First Beijing Investment Ltd new | 2,296,335 | $42M | 2.0% | 2026-Q1 |
| Artisan Partners Limited Partnership trimmed | 2,254,488 | $41M | 1.9% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,890,396 | $34M | 1.6% | 2026-Q1 |
| Kynam Capital Management, LP added | 1,576,295 | $29M | 1.4% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC added | 1,527,336 | $28M | 1.3% | 2026-Q1 |
| STATE STREET CORP trimmed | 1,498,372 | $27M | 1.3% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 1,464,112 | $26M | 1.3% | 2026-Q1 |
| Davern Capital Partners, LP added | 1,314,748 | $24M | 1.1% | 2026-Q1 |
| Patient Square Capital LP new | 990,000 | $18M | 0.9% | 2026-Q1 |
| MATTHEWS INTERNATIONAL CAPITAL MANAGEMENT LLC trimmed | 925,920 | $17M | 0.8% | 2026-Q1 |
| Hudson Bay Capital Management LP added | 876,351 | $16M | 0.8% | 2026-Q1 |
| JOHNSON & JOHNSON | 814,586 | $15M | 0.7% | 2026-Q1 |
| IvyRock Asset Management (HK) Ltd | 804,000 | $15M | 0.7% | 2026-Q1 |
| ArrowMark Colorado Holdings LLC added | 727,144 | $13M | 0.6% | 2026-Q1 |
| Capital International Investors trimmed | 647,850 | $12M | 0.6% | 2026-Q1 |
| Triata Capital Ltd added | 629,914 | $11M | 0.5% | 2026-Q1 |
| MORGAN STANLEY added | 603,247 | $11M | 0.5% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 574,898 | $10M | 0.5% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 550,051 | $10M | 0.5% | 2026-Q1 |
| SG Americas Securities, LLC added | 535,658 | $10M | 0.5% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 521,800 | $9M | 0.4% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 516,980 | $9M | 0.4% | 2026-Q1 |
| Jump Financial, LLC trimmed | 516,633 | $9M | 0.4% | 2026-Q1 |
| Squarepoint Ops LLC added | 479,480 | $9M | 0.4% | 2026-Q1 |
| Candriam S.C.A. added | 470,292 | $9M | 0.4% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 406,901 | $7M | 0.4% | 2026-Q1 |
| SEI INVESTMENTS CO added | 324,921 | $6M | 0.3% | 2026-Q1 |
| Empire Life Investments Inc. trimmed | 300,958 | $6M | 0.3% | 2026-Q1 |
| UBS Group AG added | 305,214 | $6M | 0.3% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 284,911 | $5M | 0.2% | 2026-Q1 |
| NORTHERN TRUST CORP added | 280,226 | $5M | 0.2% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 277,523 | $5M | 0.2% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 288,103 | $5M | 0.2% | 2026-Q1 |
| Walleye Capital LLC trimmed | 235,415 | $4M | 0.2% | 2026-Q1 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 234,533 | $4M | 0.2% | 2026-Q1 |
| Legal & General Group Plc added | 233,868 | $4M | 0.2% | 2026-Q1 |
| iA Global Asset Management Inc. added | 230,587 | $4M | 0.2% | 2026-Q1 |
| Ikarian Capital, LLC | 226,888 | $4M | 0.2% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd added | 223,296 | $4M | 0.2% | 2026-Q1 |
| HSBC HOLDINGS PLC trimmed | 221,475 | $4M | 0.2% | 2026-Q1 |
| XTX Topco Ltd added | 208,207 | $4M | 0.2% | 2026-Q1 |
| Woodline Partners LP added | 205,870 | $4M | 0.2% | 2026-Q1 |
| CenterBook Partners LP trimmed | 204,603 | $4M | 0.2% | 2026-Q1 |
| Trexquant Investment LP added | 191,993 | $3M | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 193,522 | $3M | 0.2% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 182,364 | $3M | 0.2% | 2026-Q1 |
| BARCLAYS PLC trimmed | 179,900 | $3M | 0.2% | 2026-Q1 |
| Tidal Investments LLC new | 179,453 | $3M | 0.2% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 177,862 | $3M | 0.2% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. | 166,590 | $3M | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 165,020 | $3M | 0.1% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND | 163,148 | $3M | 0.1% | 2026-Q1 |
| Swiss National Bank trimmed | 142,794 | $3M | 0.1% | 2026-Q1 |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC added | 138,046 | $2M | 0.1% | 2026-Q1 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 136,489 | $2M | 0.1% | 2026-Q1 |
| Raiffeisen Bank International AG added | 140,000 | $2M | 0.1% | 2026-Q1 |
| Pictet Asset Management Holding SA trimmed | 98,721 | $2M | 0.1% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 97,613 | $2M | 0.1% | 2026-Q1 |
| JANUS HENDERSON GROUP PLC added | 2,125,085 | $69M | 3.3% | 2025-Q3 stale |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 1,857,268 | $63M | 3.0% | 2025-Q1 stale |
| ALLIANCEBERNSTEIN L.P. trimmed | 1,517,067 | $33M | 1.6% | 2025-Q4 stale |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 800,220 | $28M | 1.4% | 2025-Q2 stale |
| BRAIDWELL LP trimmed | 1,298,142 | $28M | 1.3% | 2025-Q4 stale |
| TANG CAPITAL MANAGEMENT LLC | 830,000 | $27M | 1.3% | 2025-Q3 stale |
| CANADA PENSION PLAN INVESTMENT BOARD trimmed | 444,900 | $16M | 0.8% | 2025-Q2 stale |
| TWO SIGMA ADVISERS, LP trimmed | 689,600 | $15M | 0.7% | 2025-Q4 stale |
| FRANKLIN RESOURCES INC trimmed | 286,319 | $9M | 0.4% | 2025-Q3 stale |
| Eagle Health Investments LP new | 408,652 | $9M | 0.4% | 2025-Q4 stale |
| Logos Global Management LP new | 250,000 | $9M | 0.4% | 2025-Q2 stale |
| Bridgewater Associates, LP added | 225,449 | $8M | 0.4% | 2025-Q1 stale |
| Balyasny Asset Management L.P. added | 343,785 | $7M | 0.4% | 2025-Q4 stale |
| NATIONAL BANK OF CANADA /FI/ added | 210,100 | $7M | 0.3% | 2025-Q1 stale |
| Boxer Capital Management, LLC trimmed | 200,000 | $7M | 0.3% | 2025-Q1 stale |
| Rakuten Investment Management, Inc. added | 232,468 | $7M | 0.3% | 2025-Q3 stale |
| READYSTATE ASSET MANAGEMENT LP added | 178,012 | $6M | 0.3% | 2025-Q2 stale |
| Tri Locum Partners LP trimmed | 173,260 | $6M | 0.3% | 2025-Q2 stale |
| Capital International, Inc./CA/ trimmed | 157,896 | $6M | 0.3% | 2025-Q2 stale |
| LOS ANGELES CAPITAL MANAGEMENT LLC trimmed | 161,780 | $5M | 0.3% | 2025-Q1 stale |
| SUPERSTRING CAPITAL MANAGEMENT LP added | 160,442 | $5M | 0.3% | 2025-Q1 stale |
| Polymer Capital Management (HK) LTD added | 162,420 | $5M | 0.3% | 2025-Q3 stale |
| UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC added | 146,322 | $5M | 0.2% | 2025-Q2 stale |
| JANE STREET GROUP, LLC added | 238,123 | $5M | 0.2% | 2025-Q4 stale |
| Casdin Capital, LLC added | 215,000 | $5M | 0.2% | 2025-Q4 stale |
| Point72 Europe (London) LLP added | 122,274 | $4M | 0.2% | 2025-Q2 stale |
| Polar Asset Management Partners Inc. added | 107,700 | $4M | 0.2% | 2025-Q2 stale |
| GREAT POINT PARTNERS LLC trimmed | 113,460 | $4M | 0.2% | 2025-Q3 stale |
| TD Asset Management Inc added | 103,392 | $4M | 0.2% | 2025-Q2 stale |
| Taikang Asset Management (Hong Kong) Co Ltd | 100,475 | $3M | 0.2% | 2025-Q1 stale |
| VANGUARD GROUP INC added | 149,619 | $3M | 0.2% | 2025-Q4 stale |
| Greenwoods Asset Management Hong Kong Ltd. added | 90,109 | $3M | 0.1% | 2025-Q1 stale |
| PANAGORA ASSET MANAGEMENT INC added | 139,893 | $3M | 0.1% | 2025-Q4 stale |
| NEOS Investment Management LLC added | 92,017 | $2M | 0.1% | 2025-Q4 stale |
| TEMA ETFS LLC trimmed | 54,543 | $2M | 0.1% | 2025-Q3 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.