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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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PTCT short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float14.4%73,612,000 float shares
Days to Cover7.51,404,384 average daily volume
Open Short Position10,566,249PTC Therapeutics, Inc. Common
Change vs Previous+732,269+7.5%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 202610,566,249+732,269+7.5%7.514.4%
Jul 15, 20269,833,980-7,481,052-43.2%4.813.4%
Jun 30, 202617,315,032+5,531,246+46.9%5.423.5%

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, 202697,5359,740178,32854.7%3
Aug 20, 2026159,16760320,11749.7%3
Aug 19, 2026272,9660712,72938.3%2
Aug 18, 2026149,5320328,55945.5%2
Aug 17, 2026125,7060189,84866.2%3
Aug 14, 202699,5640148,09467.2%3
Aug 13, 2026149,5000215,59169.3%3
Aug 12, 2026146,1340320,15145.6%3
Aug 11, 2026238,4820323,97073.6%3
Aug 10, 2026185,5360280,96966.0%3
Aug 7, 2026248,9240380,15365.5%3
Aug 6, 2026254,7450383,02766.5%3
Aug 5, 2026259,8070471,35155.1%3
Aug 4, 2026281,5630615,13345.8%3
Aug 3, 2026272,0533,573582,51146.7%3
Jul 31, 20261,168,78113,7042,108,57055.4%3
Jul 30, 2026295,9550540,55154.8%3
Jul 29, 2026196,7360294,44366.8%3
Jul 28, 2026330,02714773,99042.6%3
Jul 27, 2026217,1970520,59941.7%2
Jul 24, 2026165,7411,626328,23650.5%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.