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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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ASPN short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float11.5%76,815,000 float shares
Days to Cover9.0988,038 average daily volume
Open Short Position8,849,264Aspen Aerogels, Inc.
Change vs Previous+625,866+7.6%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 20268,849,264+625,866+7.6%9.011.5%
Jul 15, 20268,223,398+1,121,324+15.8%8.410.7%
Jun 30, 20267,102,074-8,787-0.1%3.89.2%

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, 202663,0540169,67937.2%3
Aug 20, 202684,5580190,77744.3%3
Aug 19, 202669,5160158,91443.7%3
Aug 18, 2026113,6630249,05645.6%3
Aug 17, 2026101,6610251,49340.4%2
Aug 14, 2026152,923700284,14953.8%3
Aug 13, 2026128,43610283,83145.3%3
Aug 12, 2026180,8180357,01950.6%3
Aug 11, 2026131,988600317,69741.5%3
Aug 10, 2026157,67013,597375,62942.0%3
Aug 7, 2026354,14621,585734,46448.2%3
Aug 6, 20262,542,28359,5875,881,82243.2%3
Aug 5, 2026167,2260280,53759.6%3
Aug 4, 2026183,973569307,37659.9%3
Aug 3, 2026132,31491272,00948.6%3
Jul 31, 2026140,5751229,78361.2%3
Jul 30, 2026183,0380342,84453.4%3
Jul 29, 2026147,8690304,29148.6%3
Jul 28, 2026174,668112346,70750.4%3
Jul 27, 2026176,4763,244370,14047.7%3
Jul 24, 2026165,664720302,62354.7%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.