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EOD US-equity data for investors and AI agents

Data is end-of-day, not real-time, and not investment advice

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CSTL short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float5.8%27,072,400 float shares
Days to Cover3.2491,979 average daily volume
Open Short Position1,561,988Castle Biosciences, Inc. Commo
Change vs Previous+140,195+9.9%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 20261,561,988+140,195+9.9%3.25.8%
Jul 15, 20261,421,793-69,957-4.7%5.75.3%
Jun 30, 20261,491,750+6,689+0.5%3.25.5%

Short interest is an open-position snapshot published twice monthly. It is not daily short-sale volume.

Daily off-exchange short volume

FINRA-reported short-sale transaction flow for the last 30 calendar days.

Trade DateShort VolumeShort ExemptFINRA TotalShort Volume %Facilities
Aug 21, 2026123,0410233,35952.7%3
Aug 20, 202672,4050132,65654.6%3
Aug 19, 202693,0190166,47155.9%3
Aug 18, 202669,9750130,17153.8%2
Aug 17, 202624,5651,20070,46234.9%2
Aug 14, 202622,275097,32922.9%3
Aug 13, 202661,5570114,38053.8%3
Aug 12, 202659,3910130,39245.5%3
Aug 11, 202636,416098,84636.8%3
Aug 10, 202666,2050128,89351.4%3
Aug 7, 202647,664083,64957.0%3
Aug 6, 202683,3750532,42815.7%2
Aug 5, 202680,4110322,48424.9%3
Aug 4, 2026124,3752,863256,16848.6%3
Aug 3, 2026120,1351302,12139.8%3
Jul 31, 2026245,5022,000495,40249.6%3
Jul 30, 2026135,6570253,54453.5%3
Jul 29, 202658,7060125,10646.9%3
Jul 28, 202660,382121117,91851.2%3
Jul 27, 202651,430095,01654.1%3
Jul 24, 202671,1360112,40563.3%2

Daily short volume is transaction flow reported through FINRA facilities. It does not measure open short positions and is not consolidated exchange-wide volume.