Verastem, Inc. (VSTM) Ownership
VSTM ownership summary
as of October 18, 2026- Institutions
- 82.5% of shares outstanding
- Insiders
- 0.81% of shares outstanding
- Shares outstanding
- 90.6M
- Float
- 70.5M shares available to trade
- Short interest
- 16.62% 15.0M shares short
- Days to cover
- 6.19 short interest down 17.0% vs prior month
- Institutions 82.49%
- Insiders 0.81%
- Other investors 16.70%
VSTM top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 10.16% | 9.2M | $79.5M | +3.0M (+48.4%) | June 30, 2026 |
| 2 | Nantahala Capital Management, LLC | 7.92% | 7.2M | $62.0M | +3.6M (+100.0%) | June 30, 2026 |
| 3 | Armistice Capital, LLC | 7.76% | 7.0M | $60.8M | +2.4M (+53.0%) | June 30, 2026 |
| 4 | RTW INVESTMENTS, LLC | 7.33% | 6.6M | $57.4M | +59,487 (+0.9%) | June 30, 2026 |
| 5 | Deep Track Capital, LP | 6.34% | 5.7M | $49.7M | — | June 30, 2026 |
| 6 | State Street Corp | 5.67% | 5.1M | $44.4M | +1.6M (+46.0%) | June 30, 2026 |
| 7 | Rosalind Advisors, Inc. | 4.41% | 4.0M | $34.5M | +1.8M (+86.4%) | June 30, 2026 |
| 8 | Vanguard Capital Management, LLC | 4.26% | 3.9M | $33.3M | +528,738 (+15.9%) | June 30, 2026 |
| 9 | Stonepine Capital Management Llc | 3.70% | 3.3M | $29.0M | +47,327 (+1.4%) | June 30, 2026 |
| 10 | Vanguard Portfolio Management, LLC | 3.61% | 3.3M | $28.3M | +2.5M (+331.6%) | June 30, 2026 |
| 11 | Foresite Capital Management VI LLC | 3.48% | 3.1M | $27.2M | — | June 30, 2026 |
| 12 | The Goldman Sachs Group Inc | 3.01% | 2.7M | $23.5M | +1.2M (+83.4%) | June 30, 2026 |
| 13 | Baker Bros Advisors LP | 2.76% | 2.5M | $21.6M | +1.9M (+327.4%) | June 30, 2026 |
| 14 | Alyeska Investment Group, L.P. | 2.53% | 2.3M | $19.8M | +239,625 (+11.7%) | June 30, 2026 |
| 15 | Millennium Management LLC | 2.30% | 2.1M | $18.0M | −333,962 (−13.8%) | June 30, 2026 |
| 16 | Geode Capital Management, LLC | 2.29% | 2.1M | $17.9M | +356,588 (+20.8%) | June 30, 2026 |
| 17 | AIGH Capital Management, LLC | 2.13% | 1.9M | $16.7M | −73,000 (−3.6%) | June 30, 2026 |
| 18 | Opaleye Management Inc | 1.99% | 1.8M | $15.6M | +1.8M (0.0%) | June 30, 2026 |
| 19 | Balyasny Asset Management LLC | 1.86% | 1.7M | $14.6M | +1.3M (+311.6%) | June 30, 2026 |
| 20 | Qube Research & Technologies | 1.80% | 1.6M | $14.1M | +152,460 (+10.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 16 holders added 22.6M shares and 2 cut 407K.
VSTM top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 3.10% | 2.8M | $24.3M | — | August 31, 2026 |
| 2 | State Street® SPDR® S&P® Biotech ETF | 2.50% | 2.3M | $19.6M | −43,200 (−1.9%) | September 30, 2026 |
| 3 | iShares Russell 2000 ETF | 2.36% | 2.1M | $18.5M | −24,640 (−1.1%) | September 30, 2026 |
| 4 | RTW Biotech Opportunities Ord | 2.32% | 2.1M | $18.2M | +182,318 (+9.5%) | December 31, 2025 |
| 5 | Vanguard Explorer Inv | 1.54% | 1.4M | $12.1M | +1.2M (+734.1%) | June 30, 2026 |
| 6 | Fidelity Small Cap Index | 0.96% | 873K | $7.5M | +7,949 (+0.9%) | July 31, 2026 |
| 7 | Fidelity Enhanced Small Cap Core ETF | 0.91% | 822K | $7.1M | +1,722 (+0.2%) | September 30, 2026 |
| 8 | BlackRock Advantage Small Cap Core Instl | 0.90% | 812K | $7.0M | −127,752 (−13.6%) | August 31, 2026 |
| 9 | iShares Russell 2000 Growth ETF | 0.86% | 777K | $6.7M | −983 (−0.1%) | September 30, 2026 |
| 10 | Franklin Biotechnology Discv A(acc)USD | 0.78% | 703K | $6.1M | — | September 30, 2026 |
| 11 | Vanguard Strategic Small-Cap Equity Inv | 0.59% | 537K | $4.6M | +536,651 (0.0%) | June 30, 2026 |
| 12 | Vanguard Russell 2000 ETF | 0.54% | 485K | $4.2M | +25,599 (+5.6%) | September 30, 2026 |
| 13 | Fidelity Extended Market Index | 0.46% | 418K | $3.6M | +11,649 (+2.9%) | August 31, 2026 |
| 14 | Virtus LifeSci Biotech Products ETF | 0.45% | 411K | $3.6M | — | September 30, 2026 |
| 15 | Franklin Biotechnology Discovery A | 0.44% | 402K | $3.5M | — | August 31, 2026 |
| 16 | Vanguard VIF Small Co Gr | 0.36% | 330K | $2.9M | +261,805 (+381.6%) | June 30, 2026 |
| 17 | Vanguard Market Neutral I | 0.33% | 295K | $2.6M | +295,455 (0.0%) | June 30, 2026 |
| 18 | iShares Micro-Cap ETF | 0.29% | 262K | $2.3M | −1,810 (−0.7%) | September 30, 2026 |
| 19 | Columbia Small Cap Value Discv A | 0.29% | 262K | $2.3M | +1,700 (+0.7%) | August 31, 2026 |
| 20 | iShares Genomics Immnlgy & Hlthcr ETF | 0.24% | 220K | $1.9M | +6,056 (+2.8%) | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
VSTM insider transactions
latest 20| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-02-04 | Dan Paterson | Sell | $6.69 | 970 | $6,489 |
| 2026-01-12 | Dan Paterson | Sell | $7.16 | 10,321 | $73,898 |
| 2026-01-12 | Daniel Calkins | Sell | $7.16 | 5,039 | $36,079 |
| 2025-12-24 | Daniel Calkins | Sell | $7.86 | 80 | $629 |
| 2025-12-16 | Brian M Stuglik | Sell | $9.14 | 592 | $5,411 |
| 2025-12-16 | Dan Paterson | Sell | $9.14 | 393 | $3,592 |
| 2025-12-16 | Robert E Gagnon | Sell | $9.14 | 283 | $2,587 |
| 2025-12-10 | Dan Paterson | Sell | $10.07 | 2,000 | $20,140 |
| 2025-12-08 | Dan Paterson | Sell | $10.50 | 2,000 | $21,000 |
| 2025-12-05 | Dan Paterson | Sell | $10.61 | 2,000 | $21,220 |
| 2025-12-03 | Dan Paterson | Sell | $10.00 | 2,000 | $20,000 |
| 2025-12-01 | Dan Paterson | Sell | $10.39 | 2,000 | $20,780 |
| 2025-11-28 | Dan Paterson | Sell | $10.79 | 2,000 | $21,580 |
| 2025-11-26 | Dan Paterson | Sell | $10.32 | 2,000 | $20,640 |
| 2025-11-24 | Dan Paterson | Sell | $10.00 | 2,000 | $20,000 |
| 2025-11-21 | Paul A Bunn | Sell | $10.00 | 6,250 | $62,500 |
| 2025-11-21 | Dan Paterson | Sell | $10.00 | 2,000 | $20,000 |
| 2025-11-21 | Michael Kauffman | Sell | $10.00 | 8,550 | $85,500 |
| 2025-11-03 | Dan Paterson | Sell | $9.74 | 3,299 | $32,132 |
| 2025-10-09 | Paul A Bunn | Sell | $9.06 | 8,333 | $75,497 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
VSTM shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns VSTM
Institutional investors own 82.5% of Verastem's shares and insiders 0.81%. The largest holder is BlackRock Inc with 10.16% of the shares (9.2M), as of June 30, 2026. Among the top 20 institutions, 16 added shares and 2 reduced their stake in the latest filings. Short interest is 16.62% of the float, or 6.19 days of average trading volume. The share count rose 3,712.0% since 2014.
Related: VSTM analyst forecast, VSTM key metrics. See the VSTM stock overview for the latest quote and news.
VSTM ownership FAQ
Who owns the most Verastem stock?
The largest shareholders of Verastem are BlackRock Inc (10.16%), Nantahala Capital Management, LLC (7.92%), Armistice Capital, LLC (7.76%), RTW INVESTMENTS, LLC (7.33%), Deep Track Capital, LP (6.34%).
What percentage of Verastem is owned by institutions?
Institutions hold 82.5% of Verastem's shares outstanding; insiders hold 0.81%.
Which funds own Verastem?
The largest fund holders of Verastem are Vanguard MStar Total Stk Mkt Idx Invest (3.10%), State Street® SPDR® S&P® Biotech ETF (2.50%), iShares Russell 2000 ETF (2.36%), RTW Biotech Opportunities Ord (2.32%), Vanguard Explorer Inv (1.54%).
What is Verastem's short interest?
15.0M shares of Verastem were sold short, 16.62% of the float; at the average daily volume it would take 6.19 days to cover.
Are insiders buying or selling Verastem?
Of the latest 20 reported insider transactions in Verastem (since October 9, 2025), 0 were purchases and 20 were sales.
How many shares of Verastem are outstanding?
Verastem has 90.6M shares outstanding, of which 70.5M are in the public float.