Who owns Verastem (VSTM)
Which tracked institutional funds hold VSTM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See VSTM company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 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
24 tracked funds added or opened VSTM while 55 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
VSTM’s largest tracked holder by dollar value, BlackRock, Inc., 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 gap the other way — the median holder sizes VSTM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in VSTM 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 156 tracked filers holding VSTM, 110 increased or opened the position and 55 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 VSTM 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
- VANGUARD CAPITAL MANAGEMENT LLC$18M
- Alyeska Investment Group, L.P.$11M
- AIGH Capital Management LLC$11M
- Longaeva Partners L.P.$4M
- VANGUARD PORTFOLIO MANAGEMENT LLC$4M
- BAKER BROS. ADVISORS LP$3M
Full exits 13
- VANGUARD GROUP INC$32M
- Polar Capital Holdings Plc$30M
- SymBiosis Capital Partners, LLC$15M
- FARALLON CAPITAL MANAGEMENT LLC$15M
- Vivo Capital, LLC$9M
- TANG CAPITAL MANAGEMENT LLC$8M
Largest adds
- Nantahala Capital Management, LLC$15M
- MILLENNIUM MANAGEMENT LLC$8M
- Qube Research & Technologies Ltd$6M
- Ishara Investments LP$2M
- CANTOR FITZGERALD, L. P.$2M
- J. Goldman & Co LP$2M
Largest trims
- BALYASNY ASSET MANAGEMENT L.P.$22M
- RTW INVESTMENTS, LP$16M
- Deep Track Capital, LP$14M
- CITADEL ADVISORS LLC$10M
- Logos Global Management LP$8M
- Point72 Asset Management, L.P.$8M
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 |
|---|---|---|---|---|
| BlackRock, Inc. added | 9,192,447 | $35M | 5.7% | 2026-Q2 |
| RTW INVESTMENTS, LP | 6,576,306 | $35M | 5.7% | 2026-Q1 |
| Deep Track Capital, LP | 5,740,850 | $30M | 5.0% | 2026-Q1 |
| ARMISTICE CAPITAL, LLC added | 4,592,000 | $24M | 4.0% | 2026-Q1 |
| STATE STREET CORP added | 5,133,859 | $20M | 3.2% | 2026-Q2 |
| Nantahala Capital Management, LLC added | 3,584,820 | $19M | 3.1% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 3,322,770 | $18M | 2.9% | 2026-Q1 |
| Stonepine Capital Management, LLC added | 3,302,300 | $18M | 2.8% | 2026-Q1 |
| Foresite Capital Management VI LLC added | 3,146,631 | $17M | 2.7% | 2026-Q1 |
| MORGAN STANLEY added | 2,247,273 | $12M | 1.9% | 2026-Q1 |
| Rosalind Advisors, Inc. added | 2,138,475 | $11M | 1.8% | 2026-Q1 |
| Alyeska Investment Group, L.P. added | 2,050,000 | $11M | 1.8% | 2026-Q1 |
| AIGH Capital Management LLC trimmed | 2,000,000 | $11M | 1.7% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,717,557 | $9M | 1.5% | 2026-Q1 |
| J. Goldman & Co LP added | 1,680,752 | $9M | 1.5% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 1,615,058 | $9M | 1.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 2,078,003 | $8M | 1.3% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 1,484,003 | $8M | 1.3% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 1,476,028 | $8M | 1.3% | 2026-Q1 |
| ACORN CAPITAL ADVISORS, LLC | 1,469,153 | $8M | 1.3% | 2026-Q1 |
| NEXTBio Capital Management LP trimmed | 1,306,800 | $7M | 1.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,686,575 | $6M | 1.0% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 1,105,885 | $6M | 1.0% | 2026-Q1 |
| Logos Global Management LP trimmed | 1,000,000 | $5M | 0.9% | 2026-Q1 |
| Ishara Investments LP added | 820,000 | $4M | 0.7% | 2026-Q1 |
| Longaeva Partners L.P. new | 807,755 | $4M | 0.7% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 756,875 | $4M | 0.7% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 934,565 | $4M | 0.6% | 2026-Q2 |
| Exome Asset Management LLC added | 636,700 | $3M | 0.5% | 2026-Q1 |
| BAKER BROS. ADVISORS LP new | 584,757 | $3M | 0.5% | 2026-Q1 |
| JANE STREET GROUP, LLC added | 570,618 | $3M | 0.5% | 2026-Q1 |
| Jefferies Financial Group Inc. trimmed | 556,016 | $3M | 0.5% | 2026-Q1 |
| UBS Group AG added | 543,689 | $3M | 0.5% | 2026-Q1 |
| NORTHERN TRUST CORP added | 515,786 | $3M | 0.4% | 2026-Q1 |
| Pinnacle Financial Partners, Inc. added | 495,266 | $3M | 0.4% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 494,694 | $3M | 0.4% | 2026-Q1 |
| TORONTO DOMINION BANK | 460,413 | $2M | 0.4% | 2026-Q1 |
| FMR LLC added | 626,298 | $2M | 0.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 416,985 | $2M | 0.4% | 2026-Q1 |
| XTX Topco Ltd added | 395,834 | $2M | 0.3% | 2026-Q1 |
| CANTOR FITZGERALD, L. P. added | 363,132 | $2M | 0.3% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd trimmed | 345,571 | $2M | 0.3% | 2026-Q1 |
| SPHERA FUNDS MANAGEMENT LTD. | 343,678 | $2M | 0.3% | 2026-Q1 |
| ALGERT GLOBAL LLC added | 305,246 | $2M | 0.3% | 2026-Q1 |
| Torray Investment Partners LLC added | 298,958 | $2M | 0.3% | 2026-Q1 |
| Squarepoint Ops LLC trimmed | 270,553 | $1M | 0.2% | 2026-Q1 |
| Palo Alto Investors LP new | 246,093 | $1M | 0.2% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC added | 244,103 | $1M | 0.2% | 2026-Q1 |
| Hennion & Walsh Asset Management, Inc. added | 221,323 | $1M | 0.2% | 2026-Q1 |
| SG Americas Securities, LLC trimmed | 215,004 | $1M | 0.2% | 2026-Q1 |
| Ikarian Capital, LLC | 213,865 | $1M | 0.2% | 2026-Q1 |
| Nuveen, LLC added | 206,096 | $1M | 0.2% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 199,003 | $1M | 0.2% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 196,501 | $1M | 0.2% | 2026-Q1 |
| Bank of New York Mellon Corp added | 161,707 | $857K | 0.1% | 2026-Q1 |
| Birchview Capital, LP | 150,000 | $795K | 0.1% | 2026-Q1 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 144,719 | $767K | 0.1% | 2026-Q1 |
| Seven Fleet Capital Management LP added | 123,400 | $654K | 0.1% | 2026-Q1 |
| Jump Financial, LLC new | 118,473 | $628K | 0.1% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC added | 114,891 | $609K | 0.1% | 2026-Q1 |
| ROYAL BANK OF CANADA added | 110,729 | $587K | 0.1% | 2026-Q1 |
| Rafferty Asset Management, LLC trimmed | 109,123 | $578K | 0.1% | 2026-Q1 |
| Knott David M Jr new | 104,000 | $551K | 0.1% | 2026-Q1 |
| Quarry LP added | 100,000 | $530K | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 67,270 | $519K | 0.1% | 2026-Q1 |
| Man Group plc new | 96,833 | $513K | 0.1% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 91,760 | $486K | 0.1% | 2026-Q1 |
| BARCLAYS PLC trimmed | 90,300 | $479K | 0.1% | 2026-Q1 |
| Invesco Ltd. added | 125,077 | $478K | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP new | 74,285 | $394K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS added | 71,973 | $381K | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 4,152,706 | $32M | 5.2% | 2025-Q4 stale |
| Polar Capital Holdings Plc added | 3,925,126 | $30M | 4.9% | 2025-Q4 stale |
| FARALLON CAPITAL MANAGEMENT LLC new | 2,000,000 | $15M | 2.5% | 2025-Q4 stale |
| SymBiosis Capital Partners, LLC new | 2,000,000 | $15M | 2.5% | 2025-Q4 stale |
| BVF INC/IL added | 3,404,425 | $14M | 2.3% | 2025-Q2 stale |
| MARSHALL WACE, LLP added | 1,055,389 | $9M | 1.5% | 2025-Q3 stale |
| SILVERARC CAPITAL MANAGEMENT, LLC new | 1,042,757 | $9M | 1.5% | 2025-Q3 stale |
| Vivo Capital, LLC trimmed | 1,106,524 | $9M | 1.4% | 2025-Q4 stale |
| Soleus Capital Management, L.P. | 935,909 | $8M | 1.3% | 2025-Q3 stale |
| TANG CAPITAL MANAGEMENT LLC added | 1,069,810 | $8M | 1.3% | 2025-Q4 stale |
| Octagon Capital Advisors LP new | 625,000 | $8M | 1.3% | 2025-Q1 stale |
| ORBIMED ADVISORS LLC trimmed | 887,561 | $8M | 1.3% | 2025-Q3 stale |
| Casdin Capital, LLC new | 600,000 | $4M | 0.6% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP added | 398,992 | $3M | 0.5% | 2025-Q4 stale |
| Integral Health Asset Management, LLC new | 500,000 | $3M | 0.5% | 2025-Q1 stale |
| NOMURA HOLDINGS INC added | 674,596 | $3M | 0.5% | 2025-Q2 stale |
| Woodline Partners LP added | 307,554 | $3M | 0.4% | 2025-Q3 stale |
| Polymer Capital Management (HK) LTD trimmed | 266,812 | $2M | 0.3% | 2025-Q4 stale |
| SUPERSTRING CAPITAL MANAGEMENT LP added | 336,363 | $2M | 0.3% | 2025-Q1 stale |
| Verition Fund Management LLC added | 141,832 | $1M | 0.2% | 2025-Q3 stale |
| Trexquant Investment LP trimmed | 154,768 | $1M | 0.2% | 2025-Q4 stale |
| ACUTA CAPITAL PARTNERS, LLC | 143,446 | $1M | 0.2% | 2025-Q4 stale |
| BURKEHILL GLOBAL MANAGEMENT, LP new | 125,000 | $965K | 0.2% | 2025-Q4 stale |
| JANUS HENDERSON GROUP PLC new | 88,851 | $686K | 0.1% | 2025-Q4 stale |
| TD Asset Management Inc new | 74,000 | $653K | 0.1% | 2025-Q3 stale |
| Atom Investors LP new | 67,042 | $592K | 0.1% | 2025-Q3 stale |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC trimmed | 63,411 | $560K | 0.1% | 2025-Q3 stale |
| Caption Management, LLC new | 70,405 | $544K | 0.1% | 2025-Q4 stale |
| RENAISSANCE TECHNOLOGIES LLC added | 98,600 | $409K | 0.1% | 2025-Q2 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.