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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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IONS short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float13.0%164,853,000 float shares
Days to Cover6.43,382,861 average daily volume
Open Short Position21,466,123Ionis Pharmaceuticals, Inc. Co
Change vs Previous+1,423,244+7.1%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 202621,466,123+1,423,244+7.1%6.413.0%
Jul 15, 202620,042,879+2,617,859+15.0%3.712.2%
Jun 30, 202617,425,020-332,342-1.9%7.310.6%

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, 2026589,3494301,274,30346.2%3
Aug 20, 2026352,304449861,82940.9%3
Aug 19, 2026640,4625,4481,307,97049.0%3
Aug 18, 2026551,8733,7291,023,30453.9%3
Aug 17, 2026356,6713,836656,13454.4%3
Aug 14, 2026197,6526,000589,88833.5%3
Aug 13, 2026268,0382,103444,95560.2%3
Aug 12, 2026368,0601,177997,82336.9%3
Aug 11, 2026374,5053,1471,170,61532.0%3
Aug 10, 2026407,783804715,58457.0%3
Aug 7, 2026405,9402,138662,56961.3%3
Aug 6, 2026527,0772,8791,010,24452.2%3
Aug 5, 2026414,4719,723889,27946.6%3
Aug 4, 2026659,86253,3871,058,79662.3%3
Aug 3, 2026673,1251,5861,049,78064.1%3
Jul 31, 2026611,46476,6531,012,48960.4%3
Jul 30, 2026658,41413,4191,251,74452.6%3
Jul 29, 2026875,02639,0721,364,41064.1%3
Jul 28, 2026554,2191921,008,79254.9%3
Jul 27, 2026659,7991131,043,31663.2%3
Jul 24, 2026574,828621,051,41254.7%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.