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Alumis Inc.

ALMS
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001847367

In the last 90 days, Alumis Inc. insiders filed 1 open-market purchase and 7 sales; 198 institutions reported holding it in 13F filings for Q2 2026, worth $3.32B 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
11.0M
Shares, settlement Oct 30, 2026
Change
−47.8K
−0.4% vs. Oct 15, 2026
Days to cover
5.78
Short interest ÷ average daily volume
Average daily volume
1.91M
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 2,167,236 sharesNov 15, 2024: 2,216,299 sharesNov 29, 2024: 2,429,447 sharesDec 13, 2024: 2,539,735 sharesDec 31, 2024: 2,396,527 sharesJan 15, 2025: 2,386,759 sharesJan 31, 2025: 2,371,299 sharesFeb 14, 2025: 2,811,971 sharesFeb 28, 2025: 2,937,555 sharesMar 14, 2025: 3,050,213 sharesMar 31, 2025: 4,092,320 sharesApr 15, 2025: 3,116,250 sharesApr 30, 2025: 3,533,777 sharesMay 15, 2025: 4,635,105 sharesMay 30, 2025: 3,685,903 sharesJun 13, 2025: 3,218,097 sharesJun 30, 2025: 4,033,763 sharesJul 15, 2025: 3,226,984 sharesJul 31, 2025: 2,888,755 sharesAug 15, 2025: 1,853,671 sharesAug 29, 2025: 2,038,319 sharesSep 15, 2025: 2,365,105 sharesSep 30, 2025: 2,847,084 sharesOct 15, 2025: 2,110,101 sharesOct 31, 2025: 2,812,394 sharesNov 14, 2025: 3,531,192 sharesNov 28, 2025: 3,533,932 sharesDec 15, 2025: 3,874,655 sharesDec 31, 2025: 4,492,125 sharesJan 15, 2026: 8,672,088 sharesJan 30, 2026: 8,670,302 sharesFeb 13, 2026: 9,054,577 sharesFeb 27, 2026: 7,953,241 sharesMar 13, 2026: 8,963,277 sharesMar 31, 2026: 11,230,693 sharesApr 15, 2026: 12,210,305 sharesApr 30, 2026: 11,287,439 sharesMay 15, 2026: 11,359,303 sharesMay 29, 2026: 11,072,158 sharesJun 15, 2026: 12,658,548 sharesJun 30, 2026: 14,294,503 sharesJul 15, 2026: 6,764,417 sharesJul 31, 2026: 5,766,070 sharesAug 14, 2026: 5,853,901 sharesAug 31, 2026: 5,645,753 sharesSep 15, 2026: 6,299,106 sharesSep 30, 2026: 10,295,705 sharesOct 15, 2026: 11,079,936 sharesOct 30, 2026: 11,032,098 shares
Short interest in ALMS by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 202611.0M−47.8K−0.4%1.91M5.78
Oct 15, 202611.1M+784.2K+7.6%2.28M4.87
Sep 30, 202610.3M+4.00M+63.5%2.87M3.59
Sep 15, 20266.30M+653.4K+11.6%7.18M1.00
Aug 31, 20265.65M−208.1K−3.6%799.0K7.07
Aug 14, 20265.85M+87.8K+1.5%897.6K6.52
Jul 31, 20265.77M−998.3K−14.8%943.1K6.11
Jul 15, 20266.76M−7.53M−52.7%1.77M3.81
Jun 30, 202614.3M+1.64M+12.9%1.89M7.56
Jun 15, 202612.7M+1.59M+14.3%1.45M8.70
May 29, 202611.1M−287.1K−2.5%853.9K12.97
May 15, 202611.4M+71.9K+0.6%806.7K14.08
Apr 30, 202611.3M−922.9K−7.6%1.25M9.01
Apr 15, 202612.2M+979.6K+8.7%1.25M9.79
Mar 31, 202611.2M+2.27M+25.3%2.04M5.50
Mar 13, 20268.96M+1.01M+12.7%1.21M7.44
Feb 27, 20267.95M−1.10M−12.2%1.32M6.01
Feb 13, 20269.05M+384.3K+4.4%1.19M7.63
Jan 30, 20268.67M−1.79K0.0%1.95M4.44
Jan 15, 20268.67M+4.18M+93.1%10.4M1.00
Dec 31, 20254.49M+617.5K+15.9%952.0K4.72
Dec 15, 20253.87M+340.7K+9.6%1.46M2.66
Nov 28, 20253.53M+2.74K+0.1%1.32M2.67
Nov 14, 20253.53M+718.8K+25.6%1.03M3.43
Oct 31, 20252.81M+702.3K+33.3%471.9K5.96
Oct 15, 20252.11M−737.0K−25.9%766.6K2.75
Sep 30, 20252.85M+482.0K+20.4%573.7K4.96
Sep 15, 20252.37M+326.8K+16.0%467.5K5.06
Aug 29, 20252.04M+184.6K+10.0%654.2K3.12
Aug 15, 20251.85M−1.04M−35.8%665.7K2.78
Jul 31, 20252.89M−338.2K−10.5%792.5K3.65
Jul 15, 20253.23M−806.8K−20.0%612.5K5.27
Jun 30, 20254.03M+815.7K+25.4%1.03M3.93
Jun 13, 20253.22M−467.8K−12.7%881.4K3.65
May 30, 20253.69M−949.2K−20.5%1.43M2.57
May 15, 20254.64M+1.10M+31.2%624.6K7.42
Apr 30, 20253.53M+417.5K+13.4%271.6K13.01
Apr 15, 20253.12M−976.1K−23.9%820.2K3.80
Mar 31, 20254.09M+1.04M+34.2%2.15M1.91
Mar 14, 20253.05M+112.7K+3.8%118.8K25.67
Feb 28, 20252.94M+125.6K+4.5%219.1K13.40
Feb 14, 20252.81M+440.7K+18.6%324.0K8.68
Jan 31, 20252.37M−15.5K−0.7%219.2K10.82
Jan 15, 20252.39M−9.77K−0.4%93.0K25.67
Dec 31, 20242.40M−143.2K−5.6%145.9K16.43
Dec 13, 20242.54M+110.3K+4.5%166.1K15.29
Nov 29, 20242.43M+213.1K+9.6%110.5K21.98
Nov 15, 20242.22M+49.1K+2.3%86.8K25.54
Oct 31, 20242.17M−18.6K−0.9%73.5K29.47

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 ALMS by settlement date
Settlement dateSharesPriceValue
Oct 7, 202656$6.93$388.08
Oct 6, 20261$6.84$6.84
Sep 22, 202659,795$7.90$472.4K
Sep 8, 2026291,588$11.10$3.24M
Sep 2, 2026390,745$9.47$3.70M
Aug 11, 202624$27.53$660.72
Jul 17, 20261$27.23$27.23
Jul 14, 20263$28.10$84.3
Jul 2, 20269,494$26.64$252.9K
Jul 1, 2026124,360$28.14$3.50M
Jun 30, 20263$27.14$81.42
Jun 29, 202610,546$26.40$278.4K
Jun 25, 20262$24.85$49.7
Jun 24, 20267$24.51$171.57
Jun 23, 20261$24.60$24.6
Jun 15, 2026302$24.15$7.29K
Jun 11, 20263$20.06$60.18
Jun 10, 202648$20.01$960.48
May 22, 202640,000$22.17$886.8K
May 19, 2026100$21.15$2.12K
May 14, 20262,347$24.86$58.3K
May 4, 20267$25.18$176.26
Apr 24, 2026375$25.99$9.75K
Apr 20, 20269,858$24.99$246.4K
Mar 30, 2026140$24.80$3.47K
Mar 25, 202640$23.07$922.8
Mar 24, 202623$23.36$537.28
Mar 9, 202682$26.90$2.21K
Mar 4, 202677$28.15$2.17K
Feb 27, 2026823$29.98$24.7K

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 ALMS by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 2026229,9070455,35750.5%
Nov 9, 2026344,85612861,76740.0%
Nov 6, 202695,731583474,91320.2%
Nov 5, 2026264,31813,641707,53837.4%
Nov 4, 2026190,45926,176434,30043.9%
Nov 3, 2026447,21253,2541,181,34537.9%
Nov 2, 2026131,3728,525429,43230.6%
Oct 30, 2026203,1033,200849,46423.9%
Oct 29, 2026190,7594,3601,292,37714.8%
Oct 28, 2026293,6454311,114,35526.4%
Oct 27, 2026372,5451331,671,05022.3%
Oct 26, 2026169,5600427,10639.7%
Oct 23, 2026208,5320421,61249.5%
Oct 22, 2026186,9770535,39834.9%
Oct 21, 2026192,55769432,79944.5%
Oct 20, 2026250,5960532,57047.1%
Oct 19, 2026282,1410525,85653.7%
Oct 16, 2026467,0320871,87453.6%
Oct 15, 2026309,21311908,25134.0%
Oct 14, 2026353,0150827,29242.7%
Oct 13, 2026289,489100657,22244.0%
Oct 12, 2026191,4700602,23731.8%
Oct 9, 2026166,3110404,24841.1%
Oct 8, 2026219,23511771,82628.4%
Oct 7, 2026187,9042,119649,32128.9%
Oct 6, 2026197,0521,427662,72929.7%
Oct 5, 2026542,8070973,99955.7%
Oct 2, 2026380,6321,052926,31441.1%
Oct 1, 2026261,641200710,24336.8%
Sep 30, 2026207,8460456,42545.5%

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 ALMS
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T22,277,79536,0842,214,4047,29350.7%
Sep 28, 2026T22,450,94941,2351,460,5097,53962.7%
Sep 21, 2026T22,731,84635,7611,850,2949,58959.6%
Sep 14, 2026T24,561,21150,9753,770,10710,10054.7%
Sep 7, 2026T25,216,27149,6452,698,80310,76765.9%
Aug 31, 2026T211,635,371116,09211,624,87742,95350.0%
Aug 24, 2026T2810,21121,673416,7944,55666.0%
Aug 17, 2026T21,207,75330,788596,0974,53667.0%
Aug 10, 2026T21,325,93826,805676,0584,96866.2%
Aug 3, 2026T21,152,25728,990548,0015,91567.8%
Jul 27, 2026T21,409,56232,706677,8975,43467.5%
Jul 20, 2026T21,383,96129,751458,8245,87175.1%