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Quantum QMCO

US equityMarket cap rank #3057
$34.01 −$0.50 (-1.43%)
Pre-market · Oct 6, 6:00 am ET · After hours $34.09 +0.25%
Open$34.39
Prev close$34.50
Day range$33.64 – $35.65
Volume1.65M
Market cap$1.34B
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Short interest5.19% of floatDays to cover 2.2 · as of 15 Sep 2026
Short-sale volume share14.4%5-day average of daily volume

Short-sale volume as % of daily volume

11%14%17%20%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$6.87M (9 inflow days, 11 outflow days).

Reported short interest has fallen from 5.45% to 5.19% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 2,045,010 5.2% 2.2
31 Aug 2026 1,825,608 4.6% 1.5
14 Aug 2026 2,003,862 5.1% 1.0
31 Jul 2026 2,411,356 6.1% 2.5
15 Jul 2026 2,288,430 5.8% 2.9
30 Jun 2026 2,146,146 5.5% 1.8

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