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BlackRock Science & Technology Trust

BST
Exchange
NYSE
SEC CIK
0001616678

No open-market purchases or sales by BlackRock Science & Technology Trust insiders were filed in the last 90 days; 138 institutions reported holding it in 13F filings for Q2 2026, worth $393.7M 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
100.2K
Shares, settlement Oct 30, 2026
Change
+4.08K
+4.3% vs. Oct 15, 2026
Days to cover
1.28
Short interest ÷ average daily volume
Average daily volume
78.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 29,937 sharesNov 15, 2024: 41,016 sharesNov 29, 2024: 33,250 sharesDec 13, 2024: 2,703 sharesDec 31, 2024: 7,727 sharesJan 15, 2025: 33,183 sharesJan 31, 2025: 78,273 sharesFeb 14, 2025: 53,845 sharesFeb 28, 2025: 51,041 sharesMar 14, 2025: 57,258 sharesMar 31, 2025: 60,325 sharesApr 15, 2025: 61,391 sharesApr 30, 2025: 42,123 sharesMay 15, 2025: 63,442 sharesMay 30, 2025: 25,249 sharesJun 13, 2025: 29,054 sharesJun 30, 2025: 25,267 sharesJul 15, 2025: 24,567 sharesJul 31, 2025: 23,078 sharesAug 15, 2025: 47,236 sharesAug 29, 2025: 44,178 sharesSep 15, 2025: 26,368 sharesSep 30, 2025: 28,045 sharesOct 15, 2025: 70,216 sharesOct 31, 2025: 40,815 sharesNov 14, 2025: 22,212 sharesNov 28, 2025: 7,806 sharesDec 15, 2025: 29,442 sharesDec 31, 2025: 37,221 sharesJan 15, 2026: 37,016 sharesJan 30, 2026: 37,640 sharesFeb 13, 2026: 38,334 sharesFeb 27, 2026: 16,174 sharesMar 13, 2026: 25,962 sharesMar 31, 2026: 22,085 sharesApr 15, 2026: 6,025 sharesApr 30, 2026: 2,300 sharesMay 15, 2026: 13,024 sharesMay 29, 2026: 23,049 sharesJun 15, 2026: 10,904 sharesJun 30, 2026: 29,067 sharesJul 15, 2026: 21,317 sharesJul 31, 2026: 50,409 sharesAug 14, 2026: 51,424 sharesAug 31, 2026: 95,350 sharesSep 15, 2026: 121,701 sharesSep 30, 2026: 125,865 sharesOct 15, 2026: 96,105 sharesOct 30, 2026: 100,186 shares
Short interest in BST by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 2026100.2K+4.08K+4.3%78.1K1.28
Oct 15, 202696.1K−29.8K−23.6%101.0K1.00
Sep 30, 2026125.9K+4.16K+3.4%117.2K1.07
Sep 15, 2026121.7K+26.4K+27.6%101.7K1.20
Aug 31, 202695.3K+43.9K+85.4%77.9K1.22
Aug 14, 202651.4K+1.01K+2.0%90.7K1.00
Jul 31, 202650.4K+29.1K+136.5%91.4K1.00
Jul 15, 202621.3K−7.75K−26.7%72.2K1.00
Jun 30, 202629.1K+18.2K+166.6%110.9K1.00
Jun 15, 202610.9K−12.1K−52.7%135.6K1.00
May 29, 202623.0K+10.0K+77.0%148.9K1.00
May 15, 202613.0K+10.7K+466.3%119.4K1.00
Apr 30, 20262.30K−3.73K−61.8%116.5K1.00
Apr 15, 20266.03K−16.1K−72.7%90.4K1.00
Mar 31, 202622.1K−3.88K−14.9%105.2K1.00
Mar 13, 202626.0K+9.79K+60.5%74.9K1.00
Feb 27, 202616.2K−22.2K−57.8%78.5K1.00
Feb 13, 202638.3K+694+1.8%101.9K1.00
Jan 30, 202637.6K+624+1.7%85.5K1.00
Jan 15, 202637.0K−205−0.6%91.5K1.00
Dec 31, 202537.2K+7.78K+26.4%131.3K1.00
Dec 15, 202529.4K+21.6K+277.2%93.2K1.00
Nov 28, 20257.81K−14.4K−64.9%128.8K1.00
Nov 14, 202522.2K−18.6K−45.6%156.4K1.00
Oct 31, 202540.8K−29.4K−41.9%85.3K1.00
Oct 15, 202570.2K+42.2K+150.4%89.7K1.00
Sep 30, 202528.0K+1.68K+6.4%104.5K1.00
Sep 15, 202526.4K−17.8K−40.3%90.9K1.00
Aug 29, 202544.2K−3.06K−6.5%87.4K1.00
Aug 15, 202547.2K+24.2K+104.7%95.4K1.00
Jul 31, 202523.1K−1.49K−6.1%93.0K1.00
Jul 15, 202524.6K−700−2.8%93.2K1.00
Jun 30, 202525.3K−3.79K−13.0%102.8K1.00
Jun 13, 202529.1K+3.81K+15.1%70.6K1.00
May 30, 202525.2K−38.2K−60.2%80.2K1.00
May 15, 202563.4K+21.3K+50.6%84.6K1.00
Apr 30, 202542.1K−19.3K−31.4%100.6K1.00
Apr 15, 202561.4K+1.07K+1.8%197.4K1.00
Mar 31, 202560.3K+3.07K+5.4%117.3K1.00
Mar 14, 202557.3K+6.22K+12.2%195.5K1.00
Feb 28, 202551.0K−2.80K−5.2%126.3K1.00
Feb 14, 202553.8K−24.4K−31.2%185.4K1.00
Jan 31, 202578.3K+45.1K+135.9%144.9K1.00
Jan 15, 202533.2K+25.5K+329.4%105.1K1.00
Dec 31, 20247.73K+5.02K+185.9%124.9K1.00
Dec 13, 20242.70K−30.5K−91.9%105.0K1.00
Nov 29, 202433.3K−7.77K−18.9%97.7K1.00
Nov 15, 202441.0K+11.1K+37.0%109.1K1.00
Oct 31, 202429.9K−26.5K−46.9%96.0K1.00

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 BST by settlement date
Settlement dateSharesPriceValue
Oct 13, 2026174$50.28$8.75K
Oct 6, 2026103$50.52$5.20K
Oct 5, 202622$51.33$1.13K
Sep 24, 20267,748$49.43$383.0K
Sep 17, 2026150$47.35$7.10K
Sep 14, 202649$50.33$2.47K
Sep 8, 2026356$50.76$18.1K
Aug 27, 20261,382$49.67$68.6K
Aug 26, 2026705$49.55$34.9K
Aug 25, 20261,593$49.01$78.1K
Aug 21, 2026951$49.19$46.8K
Aug 6, 202621$48.69$1.02K
Aug 5, 20261,109$48.56$53.9K
Aug 4, 2026155$47.65$7.39K
May 27, 2026567$47.83$27.1K
May 19, 2026387$44.31$17.1K
May 13, 20263$44.90$134.7
May 11, 202641$44.92$1.84K
May 6, 20268$43.56$348.48
Apr 23, 2026969$41.73$40.4K
Apr 14, 2026214$39.94$8.55K
Apr 8, 202692$37.12$3.42K
Apr 6, 202674$37.20$2.75K
Mar 9, 20261,546$39.13$60.5K
Feb 12, 20263$40.85$122.55
Feb 9, 2026200$39.56$7.91K
Jan 30, 2026570$41.21$23.5K
Jan 29, 2026102$41.20$4.20K
Jan 28, 20261$41.03$41.03
Jan 9, 202670$40.49$2.83K

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 BST by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 202623,424043,57453.8%
Nov 9, 202634,11488673,60346.3%
Nov 6, 202646,471075,56061.5%
Nov 5, 202651,925150119,56043.4%
Nov 4, 202617,086046,96636.4%
Nov 3, 202618,03348148,67437.0%
Nov 2, 202619,47697643,44944.8%
Oct 30, 202630,799072,85742.3%
Oct 29, 202629,031062,09646.8%
Oct 28, 202616,746038,77543.2%
Oct 27, 202638,96824555,19670.6%
Oct 26, 202621,380047,91244.6%
Oct 23, 202611,645034,37133.9%
Oct 22, 202619,414074,96225.9%
Oct 21, 202612,881030,45842.3%
Oct 20, 202616,060027,95257.5%
Oct 19, 202610,633034,37430.9%
Oct 16, 202615,33074545,44633.7%
Oct 15, 202624,235053,92744.9%
Oct 14, 202619,885047,57741.8%
Oct 13, 202627,444041,82165.6%
Oct 12, 20269,426021,57143.7%
Oct 9, 20268,708019,18345.4%
Oct 8, 202617,322040,27243.0%
Oct 7, 202614,045038,26136.7%
Oct 6, 202656,636091,80161.7%
Oct 5, 202635,018086,83340.3%
Oct 2, 202640,592087,04746.6%
Oct 1, 202691,15810,631141,27064.5%
Sep 30, 202669,5250109,07863.7%

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 BST
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T254,278687225,4152,88719.4%
Sep 28, 2026T2203,0072,123326,1863,64738.4%
Sep 21, 2026T259,0901,050170,3452,44825.8%
Sep 14, 2026T274,711882255,5182,96122.6%
Sep 7, 2026T255,975635228,6972,50719.7%
Aug 31, 2026T255,914690180,8222,73923.6%
Aug 24, 2026T255,196663175,5202,56523.9%
Aug 17, 2026T253,686782172,7282,66223.7%
Aug 10, 2026T248,035621158,0292,64523.3%
Aug 3, 2026T274,727750219,4133,01825.4%
Jul 27, 2026T269,2351,237225,7792,97323.5%
Jul 20, 2026T250,932676177,3162,55622.3%