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Acadia Healthcare ACHC

US equityMarket cap rank #2572Medical Care Facilities
$29.00 +$0.13 (+0.45%)
Market open · Oct 6, 12:00 pm ET · After hours $28.87 0.00%
Open$28.85
Prev close$28.87
Day range$28.43 – $29.26
Volume403.7K
Market cap$2.70B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Institutional ownership144.3%-3.37 pts vs. prior quarter
Institutions holding370+1 vs. prior quarter
Insider trades (recent)31 buys / 14 sellsNet buying
Short interest23.10% of floatDays to cover 18.8 · as of 15 Sep 2026
Short-sale volume share24.8%5-day average of daily volume

Short-sale volume as % of daily volume

16%25%33%42%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$245.8K (8 inflow days, 12 outflow days).

The five largest holders on file together own 38.3% of shares outstanding.

Largest holders

  • BlackRock16.07%
  • Wellington Management Group6.15%
  • Vanguard Portfolio Management, LLC5.77%
  • FMR5.39%
  • Vanguard Capital Management, LLC4.96%
  • Deerfield Management Company, L.P.4.85%
  • Greenlight Capital, Inc.4.73%
  • UBS Asset Management4.58%

By investor type

  • Mutual Fund86.74%
  • Hedge Fund38.92%
  • Public Company14.68%
  • Government Pension Fund2.16%
  • Individual/Insider1.66%
  • Private Company1.48%
  • Insurance Company0.15%
  • Family Office/Trust0.07%

Reported short interest has fallen from 24.51% to 23.10% 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 21,509,968 23.1% 18.8
31 Aug 2026 22,583,163 24.3% 12.7
14 Aug 2026 20,952,409 22.5% 12.5
31 Jul 2026 21,801,530 23.4% 6.7
15 Jul 2026 21,795,658 23.7% 7.2
30 Jun 2026 22,539,485 24.5% 5.4

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