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Anaptysbio, Inc

ANAB
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001370053

In the last 90 days, Anaptysbio, Inc insiders filed 0 open-market purchases and 1 sale; 214 institutions reported holding it in 13F filings for Q2 2026, worth $2.03B 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
5.05M
Shares, settlement Oct 30, 2026
Change
−341.9K
−6.3% vs. Oct 15, 2026
Days to cover
10.79
Short interest ÷ average daily volume
Average daily volume
468.1K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 6,175,471 sharesNov 15, 2024: 6,714,227 sharesNov 29, 2024: 7,099,413 sharesDec 13, 2024: 6,985,977 sharesDec 31, 2024: 7,326,087 sharesJan 15, 2025: 6,597,026 sharesJan 31, 2025: 6,034,632 sharesFeb 14, 2025: 9,308,520 sharesFeb 28, 2025: 9,030,127 sharesMar 14, 2025: 9,800,708 sharesMar 31, 2025: 10,734,726 sharesApr 15, 2025: 10,766,534 sharesApr 30, 2025: 8,962,251 sharesMay 15, 2025: 8,831,692 sharesMay 30, 2025: 9,208,659 sharesJun 13, 2025: 9,153,626 sharesJun 30, 2025: 9,362,857 sharesJul 15, 2025: 9,380,774 sharesJul 31, 2025: 9,562,636 sharesAug 15, 2025: 9,595,647 sharesAug 29, 2025: 9,697,124 sharesSep 15, 2025: 9,411,077 sharesSep 30, 2025: 7,162,596 sharesOct 15, 2025: 7,105,715 sharesOct 31, 2025: 6,849,127 sharesNov 14, 2025: 5,930,320 sharesNov 28, 2025: 5,863,333 sharesDec 15, 2025: 5,644,248 sharesDec 31, 2025: 5,142,551 sharesJan 15, 2026: 5,566,932 sharesJan 30, 2026: 5,664,742 sharesFeb 13, 2026: 5,633,784 sharesFeb 27, 2026: 5,366,443 sharesMar 13, 2026: 4,793,437 sharesMar 31, 2026: 4,811,520 sharesApr 15, 2026: 4,106,275 sharesApr 30, 2026: 4,461,532 sharesMay 15, 2026: 4,796,235 sharesMay 29, 2026: 4,821,283 sharesJun 15, 2026: 4,631,786 sharesJun 30, 2026: 5,148,302 sharesJul 15, 2026: 4,999,494 sharesJul 31, 2026: 5,401,866 sharesAug 14, 2026: 5,317,981 sharesAug 31, 2026: 5,412,436 sharesSep 15, 2026: 5,437,438 sharesSep 30, 2026: 5,236,151 sharesOct 15, 2026: 5,392,123 sharesOct 30, 2026: 5,050,250 shares
Short interest in ANAB by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 20265.05M−341.9K−6.3%468.1K10.79
Oct 15, 20265.39M+156.0K+3.0%508.0K10.62
Sep 30, 20265.24M−201.3K−3.7%639.5K8.19
Sep 15, 20265.44M+25.0K+0.5%530.3K10.25
Aug 31, 20265.41M+94.5K+1.8%347.1K15.59
Aug 14, 20265.32M−83.9K−1.6%372.1K14.29
Jul 31, 20265.40M+402.4K+8.1%749.4K7.21
Jul 15, 20265.00M−148.8K−2.9%853.5K5.86
Jun 30, 20265.15M+516.5K+11.2%622.5K8.27
Jun 15, 20264.63M−189.5K−3.9%566.9K8.17
May 29, 20264.82M+25.0K+0.5%489.7K9.85
May 15, 20264.80M+334.7K+7.5%661.0K7.26
Apr 30, 20264.46M+355.3K+8.7%816.1K5.47
Apr 15, 20264.11M−705.2K−14.7%515.2K7.97
Mar 31, 20264.81M+18.1K+0.4%694.3K6.93
Mar 13, 20264.79M−573.0K−10.7%634.2K7.56
Feb 27, 20265.37M−267.3K−4.8%298.4K17.99
Feb 13, 20265.63M−31.0K−0.6%559.4K10.07
Jan 30, 20265.66M+97.8K+1.8%322.6K17.56
Jan 15, 20265.57M+424.4K+8.3%644.0K8.64
Dec 31, 20255.14M−501.7K−8.9%423.2K12.15
Dec 15, 20255.64M−219.1K−3.7%450.2K12.54
Nov 28, 20255.86M−67.0K−1.1%663.8K8.83
Nov 14, 20255.93M−918.8K−13.4%822.2K7.21
Oct 31, 20256.85M−256.6K−3.6%297.0K23.06
Oct 15, 20257.11M−56.9K−0.8%462.0K15.38
Sep 30, 20257.16M−2.25M−23.9%902.9K7.93
Sep 15, 20259.41M−286.0K−3.0%514.1K18.31
Aug 29, 20259.70M+101.5K+1.1%377.4K25.69
Aug 15, 20259.60M+33.0K+0.4%510.1K18.81
Jul 31, 20259.56M+181.9K+1.9%508.1K18.82
Jul 15, 20259.38M+17.9K+0.2%514.7K18.23
Jun 30, 20259.36M+209.2K+2.3%478.8K19.55
Jun 13, 20259.15M−55.0K−0.6%881.3K10.39
May 30, 20259.21M+377.0K+4.3%625.1K14.73
May 15, 20258.83M−130.6K−1.5%469.8K18.80
Apr 30, 20258.96M−1.80M−16.8%575.9K15.56
Apr 15, 202510.8M+31.8K+0.3%889.5K12.10
Mar 31, 202510.7M+934.0K+9.5%1.06M10.12
Mar 14, 20259.80M+770.6K+8.5%728.8K13.45
Feb 28, 20259.03M−278.4K−3.0%704.5K12.82
Feb 14, 20259.31M+3.27M+54.3%2.19M4.25
Jan 31, 20256.03M−562.4K−8.5%693.8K8.70
Jan 15, 20256.60M−729.1K−10.0%661.0K9.98
Dec 31, 20247.33M+340.1K+4.9%619.2K11.83
Dec 13, 20246.99M−113.4K−1.6%954.9K7.32
Nov 29, 20247.10M+385.2K+5.7%441.6K16.08
Nov 15, 20246.71M+538.8K+8.7%494.2K13.59
Oct 31, 20246.18M+197.5K+3.3%611.4K10.10

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 ANAB by settlement date
Settlement dateSharesPriceValue
Oct 5, 20266,739$48.53$327.0K
Sep 25, 2026751$51.70$38.8K
Sep 4, 20269$57.46$517.14
Aug 28, 20264$57.29$229.16
Aug 24, 2026252$57.74$14.6K
Aug 11, 20264,070$55.47$225.8K
Aug 3, 2026117$53.36$6.24K
Jul 24, 2026200$54.91$11.0K
Jul 23, 2026200$52.61$10.5K
Jul 22, 2026200$53.76$10.8K
Jul 20, 20261$58.00$58
Jul 13, 20264$66.39$265.56
Jul 9, 2026509$65.35$33.3K
Jul 2, 2026124$65.43$8.11K
Jun 29, 202612,511$63.15$790.1K
Jun 18, 202625,056$56.77$1.42M
Jun 15, 2026953$56.07$53.4K
Jun 10, 20266,866$51.63$354.5K
Jun 8, 2026645$50.37$32.5K
May 29, 20269$57.02$513.18
May 27, 20265$57.77$288.85
May 26, 20261$59.71$59.71
May 20, 2026585$59.77$35.0K
May 5, 2026198$69.78$13.8K
Apr 30, 202615$62.34$935.1
Apr 24, 202615$51.27$769.05
Apr 20, 20261,113$67.51$75.1K
Apr 2, 20264,027$56.73$228.5K
Apr 1, 202621,487$55.46$1.19M
Mar 17, 20263$64.78$194.34

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 ANAB by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 11, 202633,043088,93537.2%
Nov 10, 202636,424071,36451.0%
Nov 9, 202634,554099,80834.6%
Nov 6, 202628,861075,90438.0%
Nov 5, 202658,4730113,17351.7%
Nov 4, 2026118,9270194,22661.2%
Nov 3, 202630,111062,65648.1%
Nov 2, 202643,864091,45148.0%
Oct 30, 202642,759086,32649.5%
Oct 29, 202667,7280125,40754.0%
Oct 28, 202647,335091,21851.9%
Oct 27, 202647,6040127,89037.2%
Oct 26, 202658,5000159,74836.6%
Oct 23, 202672,0080159,84345.0%
Oct 22, 202653,104086,86061.1%
Oct 21, 2026101,2191,415218,89546.2%
Oct 20, 2026174,924236378,94646.2%
Oct 19, 202672,1690167,92743.0%
Oct 16, 202698,6010154,13264.0%
Oct 15, 202683,29119,317185,81744.8%
Oct 14, 202696,2182,814171,54756.1%
Oct 13, 2026109,2195156,44969.8%
Oct 12, 202677,3210145,70053.1%
Oct 9, 202680,4090130,75361.5%
Oct 8, 2026109,3500182,71259.8%
Oct 7, 2026145,2473,199264,43654.9%
Oct 6, 2026174,51737,622262,73166.4%
Oct 5, 202689,15484172,73051.6%
Oct 2, 202670,7970173,32140.8%
Oct 1, 202670,0343,402181,36638.6%

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 ANAB
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T2790,67624,373492,5704,22861.6%
Sep 28, 2026T2879,84324,058652,1384,33257.4%
Sep 21, 2026T21,006,17226,240335,3424,45075.0%
Sep 14, 2026T2566,53921,251321,2862,82563.8%
Sep 7, 2026T2425,46016,112309,4722,35257.9%
Aug 31, 2026T2569,95120,305445,8104,83256.1%
Aug 24, 2026T2425,08714,736357,2703,35054.3%
Aug 17, 2026T2412,64818,311126,4772,55676.5%
Aug 10, 2026T2430,71417,771160,8983,03372.8%
Aug 3, 2026T2517,68618,031181,4102,52874.1%
Jul 27, 2026T2749,53820,755455,5873,64062.2%
Jul 20, 2026T21,609,72929,531383,5994,11080.8%