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ACI Worldwide ACIW

US equityMarket cap rank #2076
$51.22 +$1.07 (+2.13%)
Market closed · Oct 5, 8:10 pm ET · Last extended-hours $51.22 0.00%
Open$50.16
Prev close$50.15
Day range$50.15 – $51.65
Volume1.01M
Market cap$5.17B
P/E (TTM)23.5
Dividend yield–

Ownership & positioning

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

Short interest6.37% of floatDays to cover 8.8 · as of 15 Sep 2026
Short-sale volume share24.8%5-day average of daily volume

Short-sale volume as % of daily volume

18%24%29%34%Sep '26Sep '26Oct '26

Reported short interest has risen from 4.86% to 6.37% 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 6,427,049 6.4% 8.8
31 Aug 2026 6,305,177 6.2% 7.9
14 Aug 2026 6,028,918 6.0% 4.5
31 Jul 2026 5,736,863 5.6% 6.4
15 Jul 2026 4,739,127 4.7% 4.3
30 Jun 2026 4,942,941 4.9% 3.9

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