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Assembly Biosciences, Inc.

ASMB
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001426800

In the last 90 days, Assembly Biosciences, Inc. insiders filed 0 open-market purchases and 4 sales; 93 institutions reported holding it in 13F filings for Q2 2026, worth $514.8M 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
2.91M
Shares, settlement Oct 15, 2026
Change
+91.1K
+3.2% vs. Sep 30, 2026
Days to cover
11.07
Short interest ÷ average daily volume
Average daily volume
263.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 15, 2024: 16,423 sharesOct 31, 2024: 7,949 sharesNov 15, 2024: 11,545 sharesNov 29, 2024: 15,883 sharesDec 13, 2024: 13,318 sharesDec 31, 2024: 13,161 sharesJan 15, 2025: 14,424 sharesJan 31, 2025: 13,724 sharesFeb 14, 2025: 17,226 sharesFeb 28, 2025: 20,313 sharesMar 14, 2025: 20,705 sharesMar 31, 2025: 17,139 sharesApr 15, 2025: 18,615 sharesApr 30, 2025: 13,209 sharesMay 15, 2025: 26,314 sharesMay 30, 2025: 13,895 sharesJun 13, 2025: 16,578 sharesJun 30, 2025: 30,615 sharesJul 15, 2025: 30,649 sharesJul 31, 2025: 29,511 sharesAug 15, 2025: 530,934 sharesAug 29, 2025: 911,201 sharesSep 15, 2025: 1,066,154 sharesSep 30, 2025: 1,352,256 sharesOct 15, 2025: 1,534,291 sharesOct 31, 2025: 1,289,657 sharesNov 14, 2025: 1,306,741 sharesNov 28, 2025: 1,289,499 sharesDec 15, 2025: 1,365,795 sharesDec 31, 2025: 1,543,026 sharesJan 15, 2026: 1,565,129 sharesJan 30, 2026: 1,537,870 sharesFeb 13, 2026: 1,485,390 sharesFeb 27, 2026: 1,479,082 sharesMar 13, 2026: 1,520,887 sharesMar 31, 2026: 1,533,102 sharesApr 15, 2026: 1,530,956 sharesApr 30, 2026: 1,557,158 sharesMay 15, 2026: 1,543,140 sharesMay 29, 2026: 1,683,891 sharesJun 15, 2026: 1,865,461 sharesJun 30, 2026: 2,407,951 sharesJul 15, 2026: 2,312,058 sharesJul 31, 2026: 2,335,806 sharesAug 14, 2026: 2,314,029 sharesAug 31, 2026: 2,120,055 sharesSep 15, 2026: 2,095,568 sharesSep 30, 2026: 2,822,392 sharesOct 15, 2026: 2,913,451 shares
Short interest in ASMB by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 15, 20262.91M+91.1K+3.2%263.1K11.07
Sep 30, 20262.82M+726.8K+34.7%412.9K6.83
Sep 15, 20262.10M−24.5K−1.2%334.7K6.26
Aug 31, 20262.12M−194.0K−8.4%314.3K6.75
Aug 14, 20262.31M−21.8K−0.9%230.4K10.05
Jul 31, 20262.34M+23.7K+1.0%147.7K15.82
Jul 15, 20262.31M−95.9K−4.0%157.3K14.70
Jun 30, 20262.41M+542.5K+29.1%365.6K6.59
Jun 15, 20261.87M+181.6K+10.8%198.3K9.41
May 29, 20261.68M+140.8K+9.1%223.7K7.53
May 15, 20261.54M−14.0K−0.9%163.9K9.42
Apr 30, 20261.56M+26.2K+1.7%100.6K15.49
Apr 15, 20261.53M−2.15K−0.1%93.3K16.41
Mar 31, 20261.53M+12.2K+0.8%68.4K22.40
Mar 13, 20261.52M+41.8K+2.8%82.2K18.50
Feb 27, 20261.48M−6.31K−0.4%125.6K11.77
Feb 13, 20261.49M−52.5K−3.4%86.1K17.24
Jan 30, 20261.54M−27.3K−1.7%109.9K13.99
Jan 15, 20261.57M+22.1K+1.4%102.5K15.27
Dec 31, 20251.54M+177.2K+13.0%179.4K8.60
Dec 15, 20251.37M+76.3K+5.9%101.6K13.45
Nov 28, 20251.29M−17.2K−1.3%127.8K10.09
Nov 14, 20251.31M+17.1K+1.3%140.2K9.32
Oct 31, 20251.29M−244.6K−15.9%123.7K10.42
Oct 15, 20251.53M+182.0K+13.5%144.3K10.64
Sep 30, 20251.35M+286.1K+26.8%190.4K7.10
Sep 15, 20251.07M+155.0K+17.0%137.7K7.74
Aug 29, 2025911.2K+380.3K+71.6%151.9K6.00
Aug 15, 2025530.9K+501.4K+1,699.1%145.8K3.64
Jul 31, 202529.5K−1.14K−3.7%24.7K1.20
Jul 15, 202530.6K+34+0.1%35.2K1.00
Jun 30, 202530.6K+14.0K+84.7%49.5K1.00
Jun 13, 202516.6K+2.68K+19.3%25.3K1.00
May 30, 202513.9K−12.4K−47.2%12.5K1.11
May 15, 202526.3K+13.1K+99.2%22.8K1.15
Apr 30, 202513.2K−5.41K−29.0%11.7K1.13
Apr 15, 202518.6K+1.48K+8.6%39.8K1.00
Mar 31, 202517.1K−3.57K−17.2%34.1K1.00
Mar 14, 202520.7K+392+1.9%20.2K1.02
Feb 28, 202520.3K+3.09K+17.9%31.0K1.00
Feb 14, 202517.2K+3.50K+25.5%23.0K1.00
Jan 31, 202513.7K−700−4.9%19.8K1.00
Jan 15, 202514.4K+1.26K+9.6%34.1K1.00
Dec 31, 202413.2K−157−1.2%47.8K1.00
Dec 13, 202413.3K−2.56K−16.2%31.3K1.00
Nov 29, 202415.9K+4.34K+37.6%38.0K1.00
Nov 15, 202411.5K+3.60K+45.2%25.1K1.00
Oct 31, 20247.95K−8.47K−51.6%25.0K1.00
Oct 15, 202416.4K−1.37K−7.7%26.8K1.00

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 ASMB by settlement date
Settlement dateSharesPriceValue
Aug 31, 20262,727$34.07$92.9K
Aug 19, 20264,381$32.13$140.8K
Aug 17, 2026283$32.95$9.32K
Aug 5, 202651$26.44$1.35K
Jul 27, 20261,780$25.55$45.5K
Jul 16, 202613$26.73$347.49
Jul 8, 20266$28.97$173.82
Jul 7, 20264$28.90$115.6
Jul 1, 2026116$27.48$3.19K
Jun 30, 202639,638$26.96$1.07M
Jun 29, 2026138$26.74$3.69K
Jun 26, 2026163$24.26$3.95K
Jun 24, 20261,153$26.80$30.9K
Jun 23, 2026903$25.15$22.7K
Jun 22, 20268$24.44$195.52
Jun 18, 20261$24.15$24.15
Jun 17, 20265,172$23.33$120.7K
Jun 16, 20261,934$23.34$45.1K
Jun 15, 2026288$22.96$6.61K
Jun 8, 2026600$22.90$13.7K
Jun 5, 2026600$24.11$14.5K
May 13, 2026463$30.82$14.3K
May 4, 2026203$27.37$5.56K
Apr 13, 20263,913$28.42$111.2K
Apr 9, 20262$29.35$58.7
Apr 8, 2026399$28.53$11.4K
Mar 31, 2026508$26.64$13.5K
Mar 23, 2026309$28.46$8.79K
Mar 4, 2026460$28.80$13.2K
Feb 4, 202653$28.24$1.50K

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 ASMB by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 9, 202656,9190156,52036.4%
Nov 6, 202648,4890111,65443.4%
Nov 5, 2026119,0700170,80669.7%
Nov 4, 202650,334096,08952.4%
Nov 3, 202633,282049,63867.0%
Nov 2, 202657,5762,95582,83069.5%
Oct 30, 202634,329045,75175.0%
Oct 29, 202651,133079,00564.7%
Oct 28, 202629,748045,86964.9%
Oct 27, 202633,111059,41255.7%
Oct 26, 202632,945052,96162.2%
Oct 23, 202646,413065,81970.5%
Oct 22, 202620,634039,57452.1%
Oct 21, 202663,593095,44666.6%
Oct 20, 202649,050070,23469.8%
Oct 19, 202640,063059,96166.8%
Oct 16, 202623,564054,41643.3%
Oct 15, 202635,522073,94248.0%
Oct 14, 202643,25561579,58654.4%
Oct 13, 202632,23837077,48541.6%
Oct 12, 202647,2080104,43045.2%
Oct 9, 202645,875064,27571.4%
Oct 8, 202636,603047,64176.8%
Oct 7, 202653,254069,71776.4%
Oct 6, 202643,291078,00955.5%
Oct 5, 202651,073082,36862.0%
Oct 2, 202697,2491,800149,18165.2%
Oct 1, 202675,4260195,06538.7%
Sep 30, 202627,074077,20135.1%
Sep 29, 202630,481089,31434.1%

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 ASMB
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2262,19111,367214,4601,45155.0%
Sep 28, 2026T2455,29213,684104,6981,58481.3%
Sep 21, 2026T2294,04911,639388,4612,56843.1%
Sep 14, 2026T2468,04814,082462,7503,13850.3%
Sep 7, 2026T2402,84111,455149,9231,85572.9%
Aug 31, 2026T2362,28813,501135,3512,47272.8%
Aug 24, 2026T2542,54211,059115,3203,55882.5%
Aug 17, 2026T2702,97713,736132,1972,13884.2%
Aug 10, 2026T2474,0629,308550,5611,68146.3%
Aug 3, 2026T2162,5266,91755,91785274.4%
Jul 27, 2026T2140,9386,06825,55390984.7%
Jul 20, 2026T2253,2857,01041,08984686.0%