Who owns Summit Therapeutics (SMMT)
Which tracked institutional funds hold SMMT, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See SMMT company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
55 tracked funds added or opened SMMT while 65 trimmed or exited it between 2026-Q1 and 2026-Q2 — 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
SMMT’s largest tracked holder by dollar value, BAKER BROS. ADVISORS LP, sizes it at 2.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 2.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in SMMT 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 2026-Q1 and 2026-Q2, across 232 tracked filers holding SMMT, 145 increased or opened the position and 102 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases. A multi-insider buy cluster also fired inside the quarter.
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 SMMT between the 2026-Q1 and 2026-Q2 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 20
- ADAGE CAPITAL PARTNERS GP, L.L.C.$29M
- Logos Global Management LP$20M
- Octagon Capital Advisors LP$18M
- Kynam Capital Management, LP$17M
- Elmind Capital, LP$7M
- Ghisallo Capital Management LLC$5M
Full exits 13
- SUPERSTRING CAPITAL MANAGEMENT LP$17M
- TUDOR INVESTMENT CORP ET AL$7M
- ExodusPoint Capital Management, LP$5M
- Y-Intercept (Hong Kong) Ltd$2M
- Jefferies Financial Group Inc.$2M
- CANADA PENSION PLAN INVESTMENT BOARD$2M
Largest adds
- GOLDMAN SACHS GROUP INC$60M
- Point72 Asset Management, L.P.$39M
- MILLENNIUM MANAGEMENT LLC$32M
- CITADEL ADVISORS LLC$19M
- BALYASNY ASSET MANAGEMENT L.P.$17M
- Aberdeen Group plc$12M
Largest trims
- BAKER BROS. ADVISORS LP$212M
- PRICE T ROWE ASSOCIATES INC /MD/$100M
- FMR LLC$59M
- BlackRock, Inc.$44M
- VANGUARD PORTFOLIO MANAGEMENT LLC$26M
- VANGUARD CAPITAL MANAGEMENT LLC$25M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BAKER BROS. ADVISORS LP trimmed | 32,786,348 | $478M | 24.5% | 2026-Q2 |
| FMR LLC trimmed | 10,043,947 | $146M | 7.5% | 2026-Q2 |
| STATE STREET CORP added | 9,536,796 | $139M | 7.1% | 2026-Q2 |
| BlackRock, Inc. trimmed | 9,529,041 | $139M | 7.1% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 5,734,484 | $84M | 4.3% | 2026-Q2 |
| UBS Group AG added | 5,233,798 | $76M | 3.9% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC trimmed | 5,042,190 | $73M | 3.8% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 4,513,399 | $66M | 3.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 3,893,820 | $57M | 2.9% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 3,697,803 | $54M | 2.8% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 3,427,263 | $50M | 2.6% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 2,349,081 | $34M | 1.8% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 1,989,591 | $29M | 1.5% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,904,254 | $28M | 1.4% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 1,725,716 | $25M | 1.3% | 2026-Q2 |
| Aberdeen Group plc added | 1,693,626 | $25M | 1.3% | 2026-Q2 |
| Squarepoint Ops LLC added | 1,590,736 | $23M | 1.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,450,019 | $21M | 1.1% | 2026-Q2 |
| NORGES BANK added | 1,382,519 | $20M | 1.0% | 2026-Q2 |
| Logos Global Management LP new | 1,350,000 | $20M | 1.0% | 2026-Q2 |
| Octagon Capital Advisors LP new | 1,250,000 | $18M | 0.9% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 1,243,556 | $18M | 0.9% | 2026-Q2 |
| Kynam Capital Management, LP new | 1,200,000 | $17M | 0.9% | 2026-Q2 |
| Pictet Asset Management Holding SA trimmed | 1,134,299 | $16M | 0.8% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 976,851 | $14M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 966,585 | $14M | 0.7% | 2026-Q2 |
| APEIRON CAPITAL Ltd trimmed | 961,866 | $14M | 0.7% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 864,983 | $13M | 0.6% | 2026-Q2 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 835,963 | $12M | 0.6% | 2026-Q2 |
| Rock Springs Capital Management LP added | 715,000 | $10M | 0.5% | 2026-Q2 |
| CITIGROUP INC added | 714,000 | $10M | 0.5% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP trimmed | 696,714 | $10M | 0.5% | 2026-Q2 |
| NORTHERN TRUST CORP added | 633,794 | $9M | 0.5% | 2026-Q2 |
| MARSHALL WACE, LLP added | 577,190 | $8M | 0.4% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 542,178 | $8M | 0.4% | 2026-Q2 |
| Candriam S.C.A. trimmed | 532,432 | $8M | 0.4% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 521,339 | $8M | 0.4% | 2026-Q2 |
| Elmind Capital, LP new | 493,820 | $7M | 0.4% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 441,934 | $6M | 0.3% | 2026-Q2 |
| Bank of New York Mellon Corp added | 431,299 | $6M | 0.3% | 2026-Q2 |
| WORLDQUANT MILLENNIUM ADVISORS LLC added | 431,028 | $6M | 0.3% | 2026-Q2 |
| TD Asset Management Inc trimmed | 426,084 | $6M | 0.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 416,847 | $6M | 0.3% | 2026-Q2 |
| Jump Financial, LLC added | 389,618 | $6M | 0.3% | 2026-Q2 |
| QVT Financial LP | 360,524 | $5M | 0.3% | 2026-Q2 |
| Ghisallo Capital Management LLC new | 350,000 | $5M | 0.3% | 2026-Q2 |
| HOHIMER WEALTH MANAGEMENT, LLC new | 339,100 | $5M | 0.3% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE trimmed | 298,000 | $4M | 0.2% | 2026-Q2 |
| Nuveen, LLC added | 294,867 | $4M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 274,894 | $4M | 0.2% | 2026-Q2 |
| DARK FOREST CAPITAL MANAGEMENT LP added | 243,607 | $4M | 0.2% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 239,347 | $3M | 0.2% | 2026-Q2 |
| Polymer Capital Management (HK) LTD added | 224,853 | $3M | 0.2% | 2026-Q2 |
| SECTORAL ASSET MANAGEMENT INC added | 220,180 | $3M | 0.2% | 2026-Q2 |
| Woodline Partners LP | 214,507 | $3M | 0.2% | 2026-Q2 |
| BARCLAYS PLC added | 210,207 | $3M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 208,413 | $3M | 0.2% | 2026-Q2 |
| Rafferty Asset Management, LLC trimmed | 206,625 | $3M | 0.2% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 199,390 | $3M | 0.1% | 2026-Q2 |
| GRIFFIN ASSET MANAGEMENT, INC. added | 193,582 | $3M | 0.1% | 2026-Q2 |
| ADAR1 Capital Management, LLC added | 191,869 | $3M | 0.1% | 2026-Q2 |
| Trexquant Investment LP new | 184,013 | $3M | 0.1% | 2026-Q2 |
| Focus Partners Wealth added | 170,338 | $2M | 0.1% | 2026-Q2 |
| China Universal Asset Management Co., Ltd. trimmed | 133,527 | $2M | 0.1% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 127,978 | $2M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS trimmed | 126,895 | $2M | 0.1% | 2026-Q2 |
| Tema ETFs LLC added | 121,097 | $2M | 0.1% | 2026-Q2 |
| Tidal Investments LLC added | 121,097 | $2M | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 120,560 | $2M | 0.1% | 2026-Q2 |
| Cerity Partners LLC added | 114,505 | $2M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 113,452 | $2M | 0.1% | 2026-Q2 |
| NOMURA HOLDINGS INC trimmed | 112,359 | $2M | 0.1% | 2026-Q2 |
| BANK OF MONTREAL /CAN/ trimmed | 104,625 | $2M | 0.1% | 2026-Q2 |
| PROFUND ADVISORS LLC trimmed | 100,549 | $1M | 0.1% | 2026-Q2 |
| Caption Management, LLC added | 100,000 | $1M | 0.1% | 2026-Q2 |
| Beacon Pointe Advisors, LLC added | 98,114 | $1M | 0.1% | 2026-Q2 |
| LMR Partners LLP added | 96,177 | $1M | 0.1% | 2026-Q2 |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM trimmed | 94,229 | $1M | 0.1% | 2026-Q2 |
| AXQ CAPITAL, LP added | 93,624 | $1M | 0.1% | 2026-Q2 |
| Schonfeld Strategic Advisors LLC added | 91,557 | $1M | 0.1% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 90,338 | $1M | 0.1% | 2026-Q2 |
| Wealth Management Partners, LLC added | 89,274 | $1M | 0.1% | 2026-Q2 |
| XTX Topco Ltd added | 81,402 | $1M | 0.1% | 2026-Q2 |
| Seven Fleet Capital Management LP new | 73,300 | $1M | 0.1% | 2026-Q2 |
| NICOLET BANKSHARES INC new | 72,593 | $1M | 0.1% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 68,169 | $1M | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 67,871 | $989K | 0.1% | 2026-Q2 |
| GUGGENHEIM CAPITAL LLC added | 67,835 | $988K | 0.1% | 2026-Q2 |
| VARCOV Co. added | 63,957 | $932K | 0.0% | 2026-Q2 |
| Illinois Municipal Retirement Fund trimmed | 62,734 | $914K | 0.0% | 2026-Q2 |
| Bridgefront Capital, LLC new | 60,416 | $880K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey added | 60,337 | $879K | 0.0% | 2026-Q2 |
| DIADEMA PARTNERS LP added | 60,000 | $874K | 0.0% | 2026-Q2 |
| Assenagon Asset Management S.A. | 59,621 | $869K | 0.0% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 59,105 | $861K | 0.0% | 2026-Q2 |
| Entropy Technologies, LP added | 57,017 | $831K | 0.0% | 2026-Q2 |
| Hudson Bay Capital Management LP added | 54,950 | $801K | 0.0% | 2026-Q2 |
| Machina Capital S.A.S. added | 54,875 | $800K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND | 53,777 | $784K | 0.0% | 2026-Q2 |
| DNB Asset Management AS trimmed | 49,305 | $718K | 0.0% | 2026-Q2 |
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.