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Verastem, Inc.

VSTM
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001526119

In the last 90 days, Verastem, Inc. insiders filed 0 open-market purchases and 4 sales; 156 institutions reported holding it in 13F filings for Q2 2026, worth $363.5M in total; no superinvestor holds it.

Four kinds of short-selling data, each measuring something different:

  • Short interest: shares sold short and not yet bought back, as of a settlement date. FINRA publishes it twice a month, about eight business days after the settlement date.
  • Daily short volume: shares sold short each day in off-exchange trades reported to FINRA. It counts trades, not open positions, and is published the next day.
  • Fails-to-deliver: shares not delivered by the settlement date. The SEC publishes them twice a month, about two weeks late.
  • ATS (dark pool) volume: weekly volume on alternative trading systems and other off-exchange venues. FINRA publishes it two to four weeks after the week.

More in the glossary.

Short interest

Shares sold short and not yet bought back, from FINRA, on every settlement date in the last two years.

Short interest
19.7M
Shares, settlement Oct 30, 2026
Change
+2.47M
+14.3% vs. Oct 15, 2026
Days to cover
5.17
Short interest ÷ average daily volume
Average daily volume
3.80M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,462,203 sharesNov 15, 2024: 2,356,826 sharesNov 29, 2024: 2,004,022 sharesDec 13, 2024: 2,619,242 sharesDec 31, 2024: 3,090,756 sharesJan 15, 2025: 4,927,281 sharesJan 31, 2025: 5,240,330 sharesFeb 14, 2025: 5,582,900 sharesFeb 28, 2025: 5,964,402 sharesMar 14, 2025: 7,321,486 sharesMar 31, 2025: 7,881,216 sharesApr 15, 2025: 8,816,146 sharesApr 30, 2025: 9,322,943 sharesMay 15, 2025: 13,280,930 sharesMay 30, 2025: 13,178,438 sharesJun 13, 2025: 12,182,979 sharesJun 30, 2025: 15,748,949 sharesJul 15, 2025: 18,107,601 sharesJul 31, 2025: 17,053,705 sharesAug 15, 2025: 15,961,742 sharesAug 29, 2025: 15,964,999 sharesSep 15, 2025: 16,820,046 sharesSep 30, 2025: 17,472,645 sharesOct 15, 2025: 18,094,970 sharesOct 31, 2025: 17,632,734 sharesNov 14, 2025: 19,141,071 sharesNov 28, 2025: 18,393,487 sharesDec 15, 2025: 16,721,345 sharesDec 31, 2025: 17,017,419 sharesJan 15, 2026: 17,115,556 sharesJan 30, 2026: 16,459,027 sharesFeb 13, 2026: 18,052,448 sharesFeb 27, 2026: 17,095,624 sharesMar 13, 2026: 17,851,179 sharesMar 31, 2026: 16,365,830 sharesApr 15, 2026: 17,417,758 sharesApr 30, 2026: 17,523,588 sharesMay 15, 2026: 17,870,249 sharesMay 29, 2026: 21,213,623 sharesJun 15, 2026: 21,774,894 sharesJun 30, 2026: 24,142,937 sharesJul 15, 2026: 20,103,345 sharesJul 31, 2026: 19,825,791 sharesAug 14, 2026: 18,909,052 sharesAug 31, 2026: 18,298,315 sharesSep 15, 2026: 18,028,616 sharesSep 30, 2026: 14,964,825 sharesOct 15, 2026: 17,201,810 sharesOct 30, 2026: 19,668,688 shares
Short interest in VSTM by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202619.7M+2.47M+14.3%3.80M5.17
Oct 15, 202617.2M+2.24M+15.0%6.91M2.49
Sep 30, 202615.0M−3.06M−17.0%2.15M6.97
Sep 15, 202618.0M−269.7K−1.5%2.77M6.52
Aug 31, 202618.3M−610.7K−3.2%1.67M10.97
Aug 14, 202618.9M−916.7K−4.6%1.96M9.63
Jul 31, 202619.8M−277.6K−1.4%2.12M9.35
Jul 15, 202620.1M−4.04M−16.7%2.94M6.83
Jun 30, 202624.1M+2.37M+10.9%3.47M6.95
Jun 15, 202621.8M+561.3K+2.7%2.45M8.89
May 29, 202621.2M+3.34M+18.7%2.09M10.13
May 15, 202617.9M+346.7K+2.0%2.56M6.99
Apr 30, 202617.5M+105.8K+0.6%2.00M8.78
Apr 15, 202617.4M+1.05M+6.4%1.93M9.00
Mar 31, 202616.4M−1.49M−8.3%2.70M6.07
Mar 13, 202617.9M+755.6K+4.4%1.70M10.52
Feb 27, 202617.1M−956.8K−5.3%1.26M13.54
Feb 13, 202618.1M+1.59M+9.7%1.71M10.57
Jan 30, 202616.5M−656.5K−3.8%1.64M10.04
Jan 15, 202617.1M+98.1K+0.6%2.38M7.18
Dec 31, 202517.0M+296.1K+1.8%1.83M9.30
Dec 15, 202516.7M−1.67M−9.1%1.56M10.74
Nov 28, 202518.4M−747.6K−3.9%2.85M6.45
Nov 14, 202519.1M+1.51M+8.6%2.66M7.18
Oct 31, 202517.6M−462.2K−2.6%2.64M6.68
Oct 15, 202518.1M+622.3K+3.6%1.74M10.41
Sep 30, 202517.5M+652.6K+3.9%1.81M9.67
Sep 15, 202516.8M+855.0K+5.4%2.50M6.73
Aug 29, 202516.0M+3.26K0.0%2.63M6.06
Aug 15, 202516.0M−1.09M−6.4%3.07M5.20
Jul 31, 202517.1M−1.05M−5.8%2.71M6.29
Jul 15, 202518.1M+2.36M+15.0%2.13M8.51
Jun 30, 202515.7M+3.57M+29.3%3.01M5.23
Jun 13, 202512.2M−995.5K−7.6%2.40M5.07
May 30, 202513.2M−102.5K−0.8%2.29M5.76
May 15, 202513.3M+3.96M+42.5%1.77M7.52
Apr 30, 20259.32M+506.8K+5.8%1.51M6.18
Apr 15, 20258.82M+934.9K+11.9%968.7K9.10
Mar 31, 20257.88M+559.7K+7.7%682.8K11.54
Mar 14, 20257.32M+1.36M+22.8%1.27M5.78
Feb 28, 20255.96M+381.5K+6.8%406.7K14.67
Feb 14, 20255.58M+342.6K+6.5%515.5K10.83
Jan 31, 20255.24M+313.0K+6.4%1.23M4.27
Jan 15, 20254.93M+1.84M+59.4%2.29M2.15
Dec 31, 20243.09M+471.5K+18.0%2.40M1.29
Dec 13, 20242.62M+615.2K+30.7%1.06M2.47
Nov 29, 20242.00M−352.8K−15.0%1.00M1.99
Nov 15, 20242.36M−105.4K−4.3%1.08M2.19
Oct 31, 20242.46M+22.0K+0.9%1.47M1.67

Fails-to-deliver

Shares that weren't delivered by the settlement date, from the SEC, for the last 30 dates with fails. The price is the previous day's closing price published by the SEC.

Fails-to-deliver in VSTM by settlement date
Settlement dateSharesPriceValue
Oct 14, 2026107,998$7.45$804.6K
Oct 9, 2026148,209$8.11$1.20M
Oct 8, 2026216,889$8.27$1.79M
Oct 2, 202675$7.90$592.5
Sep 8, 20265,469$8.20$44.8K
Aug 31, 202659$7.22$425.98
Aug 25, 20264,337$6.86$29.8K
Aug 24, 202645,282$6.89$312.0K
Aug 21, 202612,477$6.82$85.1K
Aug 20, 202644,300$7.30$323.4K
Aug 19, 202618,363$7.43$136.4K
Aug 18, 20264,064$7.18$29.2K
Aug 17, 20267,277$6.58$47.9K
Aug 14, 20262,641$6.67$17.6K
Aug 6, 202641,075$5.87$241.1K
Jul 30, 20262$6.01$12.02
Jul 29, 2026110$6.23$685.3
Jul 20, 2026148$6.03$892.44
Jul 17, 20262,603$5.77$15.0K
Jul 15, 2026256$5.57$1.43K
Jul 9, 2026183,141$5.08$930.4K
Jul 8, 20264$4.85$19.4
Jun 30, 202681,336$3.82$310.7K
Jun 29, 2026123,907$3.78$468.4K
Jun 26, 202629,798$3.45$102.8K
Jun 17, 202652$4.01$208.52
Jun 15, 20261,303$4.10$5.34K
Jun 12, 20267,615$3.94$30.0K
May 21, 202613,000$4.13$53.7K
May 19, 2026106$4.26$451.56

Daily short volume

Off-exchange short-sale volume, not short interest: shares sold short each day in trades reported to FINRA, for the last 30 trading days.

The short volume ratio isn't a sentiment gauge: market makers sell short to fill buy orders and to hedge, so short sales are usually about half of off-exchange volume.

Off-exchange short volume in VSTM by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026326,7590822,18939.7%
Nov 9, 2026365,7137,217871,19042.0%
Nov 6, 20261,786,89335,4453,072,19958.2%
Nov 5, 2026552,22921,104,98950.0%
Nov 4, 2026510,7382,8651,086,41747.0%
Nov 3, 2026310,1798,2371,089,96728.5%
Nov 2, 2026290,965601685,98142.4%
Oct 30, 2026444,0479,189882,98350.3%
Oct 29, 2026470,7202,948824,11457.1%
Oct 28, 2026751,2572011,241,94960.5%
Oct 27, 20261,610,7311,6162,285,15770.5%
Oct 26, 20261,108,34216,0142,504,73544.2%
Oct 23, 20261,085,5681,8181,674,86964.8%
Oct 22, 2026980,4101323,112,06831.5%
Oct 21, 2026550,8898231,492,72736.9%
Oct 20, 2026637,3311,2641,707,59037.3%
Oct 19, 2026600,1991,1221,161,69651.7%
Oct 16, 20261,146,6307,3722,432,26147.1%
Oct 15, 20263,420,018255,0187,642,51544.7%
Oct 14, 20267,663,418381,83814,135,91154.2%
Oct 13, 2026574,7269851,226,61946.9%
Oct 12, 2026884,34941,413,14062.6%
Oct 9, 2026473,8054,0341,032,67445.9%
Oct 8, 2026568,17228809,05470.2%
Oct 7, 2026397,0973,6411,254,68731.6%
Oct 6, 2026428,3650832,27051.5%
Oct 5, 2026322,3080628,86651.3%
Oct 2, 2026729,224111,816,66640.1%
Oct 1, 2026280,787200476,64958.9%
Sep 30, 2026158,801326404,32739.3%

ATS (dark pool) volume

Weekly volume on alternative trading systems (ATS) and other off-exchange (OTC) venues, from FINRA, for the last 12 weeks. ATS share is ATS volume ÷ (ATS + OTC volume), not a share of all trading.

Weekly ATS and OTC volume in VSTM
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T22,397,61540,2202,387,8429,60550.1%
Sep 28, 2026T21,569,79327,8222,742,1987,89236.4%
Sep 21, 2026T22,014,27534,1582,225,6848,31447.5%
Sep 14, 2026T21,749,88637,4471,948,3285,23047.3%
Sep 7, 2026T21,716,49228,4102,358,1735,80042.1%
Aug 31, 2026T22,128,91129,2863,729,7236,63936.3%
Aug 24, 2026T21,128,56830,2841,069,2344,53151.3%
Aug 17, 2026T22,226,57535,4271,996,8646,67952.7%
Aug 10, 2026T21,716,17838,1581,195,6525,36758.9%
Aug 3, 2026T22,003,31831,3461,411,9086,17258.7%
Jul 27, 2026T21,603,43325,9791,498,3105,82951.7%
Jul 20, 2026T21,728,72927,2162,451,8146,54741.4%