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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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SION short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float25.0%16,823,100 float shares
Days to Cover6.8618,000 average daily volume
Open Short Position4,198,394Sionna Therapeutics, Inc. Comm
Change vs Previous-1,058,883-20.1%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 20264,198,394-1,058,883-20.1%6.825.0%
Jul 15, 20265,257,277-265,030-4.8%11.531.3%
Jun 30, 20265,522,307+526,007+10.5%10.132.8%

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, 2026341,96950,882851,01540.2%3
Aug 20, 2026358,89625,126708,25550.7%3
Aug 19, 2026228,1221,656627,00436.4%3
Aug 18, 2026413,4642,5611,000,52541.3%3
Aug 17, 2026560,13615,3831,428,61739.2%3
Aug 14, 2026389,1068,5751,169,61233.3%3
Aug 13, 2026989,56915,8752,639,36537.5%3
Aug 12, 20261,151,29429,9955,328,84121.6%3
Aug 11, 20261,460,581151,7877,248,13620.2%3
Aug 10, 202611,062,1071,343,10519,181,98857.7%3
Aug 7, 2026254,8863,397354,80371.8%3
Aug 6, 2026202,3803354,71757.1%2
Aug 5, 2026192,9740288,22467.0%2
Aug 4, 2026315,593100508,65462.0%3
Aug 3, 2026158,2710249,36963.5%3
Jul 31, 2026106,5710161,40566.0%3
Jul 30, 202674,4410136,52854.5%3
Jul 29, 202688,1220129,77967.9%3
Jul 28, 202685,8210137,39662.5%3
Jul 27, 2026102,0480164,15362.2%2
Jul 24, 2026171,6370367,45146.7%3

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