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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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VRTX short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float1.6%252,442,000 float shares
Days to Cover3.01,318,061 average daily volume
Open Short Position3,942,936Vertex Pharmaceuticals Incorpo
Change vs Previous-1,043,755-20.9%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 20263,942,936-1,043,755-20.9%3.01.6%
Jul 15, 20264,986,691+48,219+1.0%3.12.0%
Jun 30, 20264,938,472+321,504+7.0%2.02.0%

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, 2026206,5881,730338,25361.1%3
Aug 20, 2026159,313140294,45254.1%3
Aug 19, 2026337,274400538,39362.6%3
Aug 18, 2026355,22938499,25971.2%3
Aug 17, 2026207,5616418,49449.6%3
Aug 14, 2026134,254109248,22854.1%3
Aug 13, 2026176,048127312,72256.3%3
Aug 12, 2026214,613379354,70060.5%3
Aug 11, 2026210,8872,170371,95556.7%3
Aug 10, 2026683,1617231,099,89462.1%3
Aug 7, 2026124,423171305,05440.8%3
Aug 6, 2026121,6408,115352,95934.5%3
Aug 5, 2026167,1142,122353,28047.3%3
Aug 4, 2026282,43324594,92447.5%3
Aug 3, 2026162,489294446,06336.4%3
Jul 31, 2026118,382192281,66642.0%3
Jul 30, 2026118,144137318,57437.1%3
Jul 29, 202689,736180348,37825.8%3
Jul 28, 2026109,66153534,91920.5%3
Jul 27, 2026110,872185527,04321.0%3
Jul 24, 2026135,2601,040372,24436.3%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.