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Data is end-of-day, not real-time, and not investment advice

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ATRA short positioning

Twice-monthly snapshots of open short positions.

Settlement 2026-07-31
Short % of Float13.4%4,018,400 float shares
Days to Cover9.457,166 average daily volume
Open Short Position536,897Atara Biotherapeutics, Inc. Co
Change vs Previous-40,738-7.0%

Short interest history

Twice-monthly snapshots of open short positions.

SettlementShort PositionChangeChange %Days to CoverShort % Float
Jul 31, 2026536,897-40,738-7.0%9.413.4%
Jul 15, 2026577,635+216,115+59.8%6.214.4%
Jun 30, 2026361,520-130,885-26.6%4.09.0%

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, 20261,939010,37818.7%3
Aug 20, 20262,85409,74729.3%2
Aug 19, 202613,830025,41954.4%2
Aug 18, 20265,19508,12264.0%3
Aug 17, 202620,81611,66328,47173.1%2
Aug 14, 20264,19536112,78432.8%2
Aug 13, 202611,3022,75438,97529.0%3
Aug 12, 202620,539035,81157.4%3
Aug 11, 20267,03108,73780.5%3
Aug 10, 20268,525021,34639.9%3
Aug 7, 20264,47008,00055.9%2
Aug 6, 20263,53206,61053.4%3
Aug 5, 20266,704011,68657.4%2
Aug 4, 20267,631017,65043.2%3
Aug 3, 20269,347022,41341.7%2
Jul 31, 20268,932012,84369.5%3
Jul 30, 202611,875028,53741.6%1
Jul 29, 20262,59906,35340.9%1
Jul 28, 202612,771027,93845.7%2
Jul 27, 202611,856027,08743.8%3
Jul 24, 202617,71520042,72341.5%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.