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Twist Bioscience Corp

TWST
Exchange
Nasdaq
Industry
Biological Products, (No Diagnostic Substances)
SEC CIK
0001581280

In the last 90 days, Twist Bioscience Corp insiders filed 0 open-market purchases and 34 sales; 339 institutions reported holding it in 13F filings for Q2 2026, worth $7.85B in total; ARK Invest is the only superinvestor holding 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
9.84M
Shares, settlement Oct 30, 2026
Change
−371.7K
−3.6% vs. Oct 15, 2026
Days to cover
4.35
Short interest ÷ average daily volume
Average daily volume
2.26M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 9,020,037 sharesNov 15, 2024: 8,747,935 sharesNov 29, 2024: 9,645,946 sharesDec 13, 2024: 8,953,899 sharesDec 31, 2024: 8,697,864 sharesJan 15, 2025: 9,175,202 sharesJan 31, 2025: 8,636,527 sharesFeb 14, 2025: 9,215,413 sharesFeb 28, 2025: 9,299,111 sharesMar 14, 2025: 8,830,123 sharesMar 31, 2025: 9,592,757 sharesApr 15, 2025: 9,726,318 sharesApr 30, 2025: 9,961,389 sharesMay 15, 2025: 10,616,307 sharesMay 30, 2025: 10,683,072 sharesJun 13, 2025: 10,308,992 sharesJun 30, 2025: 11,033,462 sharesJul 15, 2025: 10,745,056 sharesJul 31, 2025: 10,437,018 sharesAug 15, 2025: 11,008,222 sharesAug 29, 2025: 10,234,719 sharesSep 15, 2025: 12,816,246 sharesSep 30, 2025: 12,982,960 sharesOct 15, 2025: 10,860,765 sharesOct 31, 2025: 10,548,267 sharesNov 14, 2025: 10,898,965 sharesNov 28, 2025: 12,752,433 sharesDec 15, 2025: 13,742,759 sharesDec 31, 2025: 14,259,994 sharesJan 15, 2026: 12,504,532 sharesJan 30, 2026: 12,167,392 sharesFeb 13, 2026: 13,006,730 sharesFeb 27, 2026: 12,726,314 sharesMar 13, 2026: 12,863,285 sharesMar 31, 2026: 14,149,704 sharesApr 15, 2026: 14,522,121 sharesApr 30, 2026: 13,914,949 sharesMay 15, 2026: 16,578,578 sharesMay 29, 2026: 14,898,695 sharesJun 15, 2026: 17,660,235 sharesJun 30, 2026: 13,949,973 sharesJul 15, 2026: 14,116,574 sharesJul 31, 2026: 14,075,357 sharesAug 14, 2026: 14,109,131 sharesAug 31, 2026: 12,065,357 sharesSep 15, 2026: 12,505,220 sharesSep 30, 2026: 10,567,132 sharesOct 15, 2026: 10,207,499 sharesOct 30, 2026: 9,835,760 shares
Short interest in TWST by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20269.84M−371.7K−3.6%2.26M4.35
Oct 15, 202610.2M−359.6K−3.4%3.62M2.82
Sep 30, 202610.6M−1.94M−15.5%2.76M3.83
Sep 15, 202612.5M+439.9K+3.7%1.40M8.92
Aug 31, 202612.1M−2.04M−14.5%1.75M6.91
Aug 14, 202614.1M+33.8K+0.2%1.78M7.90
Jul 31, 202614.1M−41.2K−0.3%1.27M11.12
Jul 15, 202614.1M+166.6K+1.2%1.46M9.69
Jun 30, 202613.9M−3.71M−21.0%2.53M5.51
Jun 15, 202617.7M+2.76M+18.5%1.84M9.58
May 29, 202614.9M−1.68M−10.1%1.66M8.99
May 15, 202616.6M+2.66M+19.1%1.59M10.40
Apr 30, 202613.9M−607.2K−4.2%1.33M10.46
Apr 15, 202614.5M+372.4K+2.6%1.15M12.59
Mar 31, 202614.1M+1.29M+10.0%1.19M11.94
Mar 13, 202612.9M+137.0K+1.1%918.1K14.01
Feb 27, 202612.7M−280.4K−2.2%1.30M9.82
Feb 13, 202613.0M+839.3K+6.9%1.78M7.30
Jan 30, 202612.2M−337.1K−2.7%1.21M10.07
Jan 15, 202612.5M−1.76M−12.3%1.38M9.05
Dec 31, 202514.3M+517.2K+3.8%1.09M13.04
Dec 15, 202513.7M+990.3K+7.8%1.18M11.65
Nov 28, 202512.8M+1.85M+17.0%1.87M6.81
Nov 14, 202510.9M+350.7K+3.3%1.85M5.89
Oct 31, 202510.5M−312.5K−2.9%1.65M6.38
Oct 15, 202510.9M−2.12M−16.4%2.02M5.37
Sep 30, 202513.0M+166.7K+1.3%1.60M8.12
Sep 15, 202512.8M+2.58M+25.2%1.63M7.89
Aug 29, 202510.2M−773.5K−7.0%1.10M9.27
Aug 15, 202511.0M+571.2K+5.5%2.62M4.20
Jul 31, 202510.4M−308.0K−2.9%907.5K11.50
Jul 15, 202510.7M−288.4K−2.6%899.0K11.95
Jun 30, 202511.0M+724.5K+7.0%1.03M10.66
Jun 13, 202510.3M−374.1K−3.5%1.23M8.36
May 30, 202510.7M+66.8K+0.6%1.14M9.38
May 15, 202510.6M+654.9K+6.6%1.35M7.88
Apr 30, 20259.96M+235.1K+2.4%930.0K10.71
Apr 15, 20259.73M+133.6K+1.4%1.64M5.94
Mar 31, 20259.59M+762.6K+8.6%852.3K11.25
Mar 14, 20258.83M−469.0K−5.0%1.44M6.15
Feb 28, 20259.30M+83.7K+0.9%993.8K9.36
Feb 14, 20259.22M+578.9K+6.7%1.05M8.75
Jan 31, 20258.64M−538.7K−5.9%754.3K11.45
Jan 15, 20259.18M+477.3K+5.5%684.1K13.41
Dec 31, 20248.70M−256.0K−2.9%812.7K10.70
Dec 13, 20248.95M−692.0K−7.2%755.3K11.86
Nov 29, 20249.65M+898.0K+10.3%957.5K10.07
Nov 15, 20248.75M−272.1K−3.0%955.2K9.16
Oct 31, 20249.02M+189.6K+2.2%531.9K16.96

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 TWST by settlement date
Settlement dateSharesPriceValue
Oct 13, 202613,965$151.86$2.12M
Oct 9, 2026531$152.05$80.7K
Oct 8, 202670$155.65$10.9K
Oct 5, 2026536$188.67$101.1K
Sep 28, 20266$182.83$1.10K
Sep 25, 20267$184.03$1.29K
Sep 21, 20268,465$166.99$1.41M
Sep 18, 202680$155.56$12.4K
Sep 14, 20261,028$127.22$130.8K
Sep 3, 20266,650$131.00$871.1K
Aug 31, 20262,383$141.38$336.9K
Aug 28, 2026602$153.10$92.2K
Aug 26, 202642$151.42$6.36K
Aug 25, 20261$140.80$140.8
Aug 20, 20261,144$142.39$162.9K
Aug 19, 202629$116.10$3.37K
Aug 18, 202626,759$124.41$3.33M
Aug 17, 20262,921$118.57$346.3K
Aug 14, 2026452$125.29$56.6K
Aug 10, 202611,941$115.67$1.38M
Aug 7, 20263$109.08$327.24
Aug 6, 20261,352$115.01$155.5K
Aug 4, 20262,598$101.06$262.6K
Jul 24, 20266$92.44$554.64
Jul 20, 2026522$93.85$49.0K
Jul 17, 20262,578$91.23$235.2K
Jul 16, 202668$92.61$6.30K
Jul 14, 2026412$90.35$37.2K
Jul 9, 2026497$89.38$44.4K
Jul 8, 20261,268$91.03$115.4K

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 TWST by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026412,089109742,25855.5%
Nov 9, 2026355,703134621,68757.2%
Nov 6, 2026479,7153,311800,15660.0%
Nov 5, 2026781,53428,0861,331,71358.7%
Nov 4, 2026478,216260760,68062.9%
Nov 3, 2026423,4107,795804,91152.6%
Nov 2, 2026445,13618,196995,08844.7%
Oct 30, 2026929,10336,1071,640,03056.7%
Oct 29, 2026446,053842691,31064.5%
Oct 28, 2026974,5251,8951,693,25357.6%
Oct 27, 2026478,8987764,89462.6%
Oct 26, 2026350,62120602,90458.2%
Oct 23, 2026436,12618,164761,23257.3%
Oct 22, 2026519,55611,7191,280,41440.6%
Oct 21, 2026584,463531,120,98352.1%
Oct 20, 2026542,6830954,63856.8%
Oct 19, 2026352,2710572,44261.5%
Oct 16, 2026607,97820,5581,341,87645.3%
Oct 15, 2026630,27414,0151,590,42039.6%
Oct 14, 2026332,1630865,98838.4%
Oct 13, 2026219,816515671,79332.7%
Oct 12, 2026320,9906,974950,80933.8%
Oct 9, 2026637,77001,531,92041.6%
Oct 8, 20261,007,608511,858,50554.2%
Oct 7, 2026935,96361,0952,287,66440.9%
Oct 6, 20261,471,25274,9393,121,28647.1%
Oct 5, 2026597,2051,0851,218,54349.0%
Oct 2, 2026339,746651986,39234.4%
Oct 1, 2026608,7728751,219,40649.9%
Sep 30, 2026720,0492321,193,33560.3%

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 TWST
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T26,680,081103,8994,854,45668,59057.9%
Sep 28, 2026T24,091,84864,6294,448,14831,27747.9%
Sep 21, 2026T24,596,37971,8292,033,90638,17969.3%
Sep 14, 2026T23,814,27271,5441,648,33327,16269.8%
Sep 7, 2026T21,873,66337,3241,073,88113,68463.6%
Aug 31, 2026T22,318,42743,340967,53815,92970.6%
Aug 24, 2026T22,457,74345,3261,336,19722,80364.8%
Aug 17, 2026T23,555,27754,0021,350,06620,36372.5%
Aug 10, 2026T22,268,40144,6511,077,41113,77167.8%
Aug 3, 2026T23,709,17262,449961,89315,97979.4%
Jul 27, 2026T22,358,95345,704796,4789,93374.8%
Jul 20, 2026T21,726,97640,610455,6858,30179.1%