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Verastem VSTM

US equityMarket cap rank #3463Biotechnology
$8.27 +$0.52 (+6.65%)
Pre-market · Oct 8, 6:50 am ET · After hours $8.27 0.00%
Open$7.77
Prev close$7.75
Day range$7.65 – $8.36
Volume3.93M
Market cap$748.51M
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership110.0%-0.56 pts vs. prior quarter
Institutions holding182+1 vs. prior quarter
Insider trades (recent)12 buys / 38 sellsNet selling
Short interest19.91% of floatDays to cover 6.5 · as of 15 Sep 2026
Short-sale volume share24.4%5-day average of daily volume

Short-sale volume as % of daily volume

16%22%28%34%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$4.78M (11 inflow days, 9 outflow days).

Net flow by order size, last 20 sessions

−$2.4MSuper−$2.4MBig−$2.8MMid−$2.5MSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 37.2% of shares outstanding.

Largest holders

  • BlackRock10.15%
  • Armistice Capital LLC7.76%
  • RTW Investments, LP7.33%
  • Deep Track Capital, LP6.34%
  • State Street Global Advisors5.67%
  • Vanguard Capital Management, LLC4.93%
  • Rosalind Advisors, Inc.4.40%
  • Polar Capital Holdings Plc4.09%

By investor type

  • Hedge Fund47.18%
  • Mutual Fund42.11%
  • VC/PE Fund11.82%
  • Public Company6.08%
  • Private Company1.35%
  • Family Office/Trust1.21%
  • Individual/Insider0.73%
  • Insurance Company0.26%

Reported short interest has fallen from 27.47% to 19.91% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

HolderTypePeriodShare changeNew stake
BlackRock Mutual Fund 2026/Q3 +2,997,522 10.2%
Vanguard Portfolio Management, LLC Mutual Fund 2026/Q3 +2,509,995 3.6%
Armistice Capital LLC Hedge Fund 2026/Q3 +2,432,000 7.8%
Baker Bros. Advisors LP Hedge Fund 2026/Q3 +1,914,581 2.8%
Rosalind Advisors, Inc. Hedge Fund 2026/Q3 +1,848,034 4.4%
Opaleye Management Inc. Hedge Fund 2026/Q3 +1,800,000 2.0%
State Street Global Advisors Mutual Fund 2026/Q3 +1,617,208 5.7%
Balyasny Asset Management L.P. Hedge Fund 2026/Q3 +1,276,796 1.9%
The Goldman Sachs Group, Inc. Public Company 2026/Q3 +1,008,080 2.5%
AQR Capital Management Hedge Fund 2026/Q3 +866,079 1.0%
Vanguard Capital Management, LLC Mutual Fund 2026/Q3 +650,906 4.9%
Synovus Trust Company, National Association Family Office/Trust 2026/Q3 +591,174 1.2%
Bank of America Corporation Public Company 2026/Q3 +472,990 1.0%
PanAgora Asset Management, Inc. Mutual Fund 2026/Q3 +422,771 0.7%
Geode Capital Management, LLC Mutual Fund 2026/Q3 +356,588 2.3%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

DateInsiderTitleTransactionSharesPriceHeld after
30 Sep 2026 Daniel Paterson Chief Executive Officer Open Market Disposition -44,121 $8.00 309,760
30 Sep 2026 Daniel Calkins Head of Investor Relations, VP of Finance and Principal Accounting Officer & Financial Officer Open Market Disposition -2,566 $8.00 68,299
29 Sep 2026 Daniel Paterson Chief Executive Officer Other Acquisition +106,893 – 309,760
29 Sep 2026 Daniel Calkins Head of Investor Relations, VP of Finance and Principal Accounting Officer & Financial Officer Other Disposition -8,333 – 68,299
20 Sep 2026 Daniel Calkins Head of Investor Relations, VP of Finance and Principal Accounting Officer & Financial Officer Open Market Disposition -55 $7.70 62,532
2 Aug 2026 Daniel Paterson Chief Executive Officer Open Market Disposition -1,302 $5.81 246,988
22 Jul 2026 Robert Gagnon Director Intent to Sell (Form 144) -31,924 $5.89 –
24 Jun 2026 Robert Gagnon Director Intent to Sell (Form 144) -21,492 $4.21 –
21 Jun 2026 Daniel Paterson Chief Executive Officer Open Market Disposition -20,871 $4.18 245,165
21 Jun 2026 Daniel Calkins Head of Investor Relations, VP of Finance and Principal Accounting Officer & Financial Officer Open Market Disposition -4,089 $4.18 59,569
26 May 2026 Robert Gagnon Director Intent to Sell (Form 144) -20,103 $4.36 –
20 May 2026 Michael Bailey Director Other Acquisition +108,000 – 108,000
20 May 2026 Paul A. Bunn Independent Director Other Acquisition +36,000 – 36,000
20 May 2026 Eric Rowinsky Independent Director Other Acquisition +36,000 – 36,000
20 May 2026 John Johnson Independent Director Other Acquisition +36,000 – 36,000
20 May 2026 Brian Stuglik Director Other Acquisition +36,000 – 137,147
20 May 2026 Anil Kapur Independent Director Other Acquisition +36,000 – 36,000
20 May 2026 Michelle Robertson Independent Director Other Acquisition +36,000 – 36,000
20 May 2026 Karin Tollefson Director Other Acquisition +36,000 – 36,000
3 May 2026 Daniel Paterson Chief Executive Officer Open Market Disposition -806 $5.82 232,130

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 18,028,616 19.9% 6.5
31 Aug 2026 18,298,315 20.2% 11.0
14 Aug 2026 18,909,052 20.9% 9.6
31 Jul 2026 19,825,791 22.6% 9.4
15 Jul 2026 20,103,345 22.9% 6.8
30 Jun 2026 24,142,937 27.5% 7.0

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