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CalciMedica, Inc.

CALC
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001534133

No open-market purchases or sales by CalciMedica, Inc. insiders were filed in the last 90 days; 31 institutions reported holding it in 13F filings for Q2 2026, worth $8.39M 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
171.4K
Shares, settlement Oct 30, 2026
Change
+109.7K
+178.0% vs. Oct 15, 2026
Days to cover
1.78
Short interest ÷ average daily volume
Average daily volume
96.5K
Shares, as reported by FINRA
Short interest by settlement date
Oct 31, 2024: 72,576 sharesNov 15, 2024: 70,093 sharesNov 29, 2024: 45,157 sharesDec 13, 2024: 65,606 sharesDec 31, 2024: 61,281 sharesJan 15, 2025: 71,960 sharesJan 31, 2025: 69,061 sharesFeb 14, 2025: 93,271 sharesFeb 28, 2025: 97,164 sharesMar 14, 2025: 104,150 sharesMar 31, 2025: 110,224 sharesApr 15, 2025: 108,095 sharesApr 30, 2025: 69,763 sharesMay 15, 2025: 130,788 sharesMay 30, 2025: 112,961 sharesJun 13, 2025: 110,242 sharesJun 30, 2025: 106,818 sharesJul 15, 2025: 90,517 sharesJul 31, 2025: 47,356 sharesAug 15, 2025: 35,587 sharesAug 29, 2025: 63,199 sharesSep 15, 2025: 71,964 sharesSep 30, 2025: 65,344 sharesOct 15, 2025: 54,749 sharesOct 31, 2025: 55,734 sharesNov 14, 2025: 52,651 sharesNov 28, 2025: 64,428 sharesDec 15, 2025: 70,693 sharesDec 31, 2025: 79,498 sharesJan 15, 2026: 80,437 sharesJan 30, 2026: 699,828 sharesFeb 13, 2026: 427,832 sharesFeb 27, 2026: 391,796 sharesMar 13, 2026: 459,110 sharesMar 31, 2026: 337,917 sharesApr 15, 2026: 372,157 sharesApr 30, 2026: 167,953 sharesMay 15, 2026: 136,411 sharesMay 29, 2026: 144,356 sharesJun 15, 2026: 276,326 sharesJun 30, 2026: 1,651,945 sharesJul 15, 2026: 960,731 sharesJul 31, 2026: 503,070 sharesAug 14, 2026: 323,241 sharesAug 31, 2026: 127,684 sharesSep 15, 2026: 111,703 sharesSep 30, 2026: 86,433 sharesOct 15, 2026: 61,641 sharesOct 30, 2026: 171,388 shares
Short interest in CALC by settlement date
Settlement dateShort interestChangeChange %Avg. daily volumeDays to cover
Oct 30, 2026171.4K+109.7K+178.0%96.5K1.78
Oct 15, 202661.6K−24.8K−28.7%70.5K1.00
Sep 30, 202686.4K−25.3K−22.6%57.7K1.50
Sep 15, 2026111.7K−16.0K−12.5%98.6K1.13
Aug 31, 2026Split127.7K−195.6K−60.5%99.9K1.28
Aug 14, 2026323.2K−179.8K−35.8%320.7K1.01
Jul 31, 2026503.1K−457.7K−47.6%277.4K1.81
Jul 15, 2026960.7K−691.2K−41.8%406.9K2.36
Jun 30, 20261.65M+1.38M+497.8%6.19M1.00
Jun 15, 2026276.3K+132.0K+91.4%459.3K1.00
May 29, 2026144.4K+7.95K+5.8%152.4K1.00
May 15, 2026136.4K−31.5K−18.8%138.6K1.00
Apr 30, 2026168.0K−204.2K−54.9%151.8K1.11
Apr 15, 2026372.2K+34.2K+10.1%249.3K1.49
Mar 31, 2026337.9K−121.2K−26.4%244.6K1.38
Mar 13, 2026459.1K+67.3K+17.2%692.8K1.00
Feb 27, 2026391.8K−36.0K−8.4%339.5K1.15
Feb 13, 2026427.8K−272.0K−38.9%811.6K1.00
Jan 30, 2026699.8K+619.4K+770.0%5.28M1.00
Jan 15, 202680.4K+939+1.2%100.0K1.00
Dec 31, 202579.5K+8.80K+12.5%104.6K1.00
Dec 15, 202570.7K+6.26K+9.7%79.6K1.00
Nov 28, 202564.4K+11.8K+22.4%107.7K1.00
Nov 14, 202552.7K−3.08K−5.5%23.1K2.28
Oct 31, 202555.7K+985+1.8%27.5K2.02
Oct 15, 202554.7K−10.6K−16.2%61.1K1.00
Sep 30, 202565.3K−6.62K−9.2%48.9K1.34
Sep 15, 202572.0K+8.77K+13.9%109.4K1.00
Aug 29, 202563.2K+27.6K+77.6%35.6K1.77
Aug 15, 202535.6K−11.8K−24.9%35.3K1.01
Jul 31, 202547.4K−43.2K−47.7%157.6K1.00
Jul 15, 202590.5K−16.3K−15.3%94.3K1.00
Jun 30, 2025106.8K−3.42K−3.1%38.5K2.78
Jun 13, 2025110.2K−2.72K−2.4%18.1K6.10
May 30, 2025113.0K−17.8K−13.6%16.3K6.93
May 15, 2025130.8K+61.0K+87.5%46.4K2.82
Apr 30, 202569.8K−38.3K−35.5%16.6K4.21
Apr 15, 2025108.1K−2.13K−1.9%24.6K4.39
Mar 31, 2025110.2K+6.07K+5.8%87.7K1.26
Mar 14, 2025104.2K+6.99K+7.2%49.5K2.10
Feb 28, 202597.2K+3.89K+4.2%15.1K6.44
Feb 14, 202593.3K+24.2K+35.1%29.0K3.21
Jan 31, 202569.1K−2.90K−4.0%32.5K2.12
Jan 15, 202572.0K+10.7K+17.4%11.0K6.52
Dec 31, 202461.3K−4.33K−6.6%38.1K1.61
Dec 13, 202465.6K+20.4K+45.3%113.5K1.00
Nov 29, 202445.2K−24.9K−35.6%23.8K1.90
Nov 15, 202470.1K−2.48K−3.4%88.3K1.00
Oct 31, 202472.6K+38.4K+112.5%56.3K1.29

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 CALC by settlement date
Settlement dateSharesPriceValue
Oct 13, 2026658$1.21$796.18
Oct 9, 2026388$1.31$508.28
Oct 8, 20261$1.50$1.5
Oct 7, 20261$1.47$1.47
Oct 6, 20261$1.54$1.54
Oct 5, 2026711$1.62$1.15K
Oct 2, 20261$1.64$1.64
Oct 1, 20262,269$1.62$3.68K
Sep 30, 20261$1.64$1.64
Sep 29, 20261$1.70$1.7
Sep 28, 20261,708$1.75$2.99K
Sep 25, 20262$1.74$3.48
Sep 24, 20264$1.80$7.2
Sep 23, 20264$1.87$7.48
Sep 22, 20261,049$1.86$1.95K
Sep 21, 20264$1.92$7.68
Sep 18, 202613$1.97$25.61
Sep 17, 20261$1.98$1.98
Sep 16, 20261$1.98$1.98
Sep 15, 20264,639$2.00$9.28K
Sep 14, 20261$1.98$1.98
Sep 11, 20261,231$2.12$2.61K
Sep 10, 20262,131$2.30$4.90K
Sep 9, 2026585$2.02$1.18K
Sep 8, 2026992$2.17$2.15K
Sep 4, 202698$2.20$215.6
Sep 3, 2026301$2.10$632.1
Sep 2, 202642,686$2.00$85.4K
Sep 1, 202649,735$2.14$106.4K
Aug 31, 202694,855$0.46$43.6K

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 CALC by trade date
Trade dateShort volumeShort exemptOff-exchange volumeShort volume ratio
Nov 10, 20263,31004,68570.7%
Nov 9, 202619,590031,26762.7%
Nov 6, 20266,1268936,84089.6%
Nov 5, 20265,18513915,33433.8%
Nov 4, 20267,377017,33442.6%
Nov 3, 202612,12685921,95255.2%
Nov 2, 202624,4274,17066,53936.7%
Oct 30, 202619,2485136,58852.6%
Oct 29, 202625,633047,25954.2%
Oct 28, 202638,2421,05864,35059.4%
Oct 27, 20264,68680017,93826.1%
Oct 26, 202672,0641,33394,40776.3%
Oct 23, 202637,05311359,66062.1%
Oct 22, 202626,68450043,89760.8%
Oct 21, 202625,689042,50760.4%
Oct 20, 202613,634028,75847.4%
Oct 19, 20261,83708,72621.1%
Oct 16, 202677604,25718.2%
Oct 15, 20261,307011,41511.4%
Oct 14, 20267,047028,55524.7%
Oct 13, 20269,042038,65023.4%
Oct 12, 20267,322052,52813.9%
Oct 9, 202622,5241,69841,34054.5%
Oct 8, 202646,28313,90487,42352.9%
Oct 7, 202690805,54816.4%
Oct 6, 202642,282074,15757.0%
Oct 5, 20263,776012,86629.3%
Oct 2, 20266,975010,22368.2%
Oct 1, 20262,410808,50428.3%
Sep 30, 202610,29851415,76865.3%

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 CALC
Week ofTierATS sharesATS tradesOther OTC sharesOther OTC tradesATS share
Oct 5, 2026T28,08974216,2615983.6%
Sep 28, 2026T24,92513563,6734437.2%
Sep 21, 2026T212,648176133,1076768.7%
Sep 14, 2026T28,805147118,1486226.9%
Sep 7, 2026T232,420399187,56262314.7%
Aug 31, 2026T276,744763191,2811,37928.6%
Aug 24, 2026T2221,8191,0981,339,2082,30314.2%
Aug 17, 2026T288,3231,0901,035,3991,3217.9%
Aug 10, 2026T267,995957599,7971,02310.2%
Aug 3, 2026T2164,4871,641955,4901,49714.7%
Jul 27, 2026T298,561741585,9931,12214.4%
Jul 20, 2026T252,032577536,5637808.8%