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American Integrity Insurance Group AII

US equityMarket cap rank #3720Insurance - Property & Casualty
$26.45 +$0.68 (+2.64%)
Market closed · Oct 8, 7:30 am ET · Last extended-hours $26.45 0.00%
Open$25.99
Prev close$25.77
Day range$25.51 – $26.46
Volume163.6K
Market cap$518.25M
P/E (TTM)5.9
Dividend yield–

Ownership & positioning

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

Institutional ownership80.6%-0.22 pts vs. prior quarter
Institutions holding130+1 vs. prior quarter
Insider trades (recent)30 buys / 20 sellsNet buying
Short interest1.17% of floatDays to cover 1.1 · as of 15 Sep 2026
Short-sale volume share20.8%5-day average of daily volume

Short-sale volume as % of daily volume

14%20%27%33%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$94.9K (9 inflow days, 11 outflow days).

Net flow by order size, last 20 sessions

−$11.3KSuper+$106.1KBig+$259.1KMid+$704.2KSmall

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 52.4% of shares outstanding.

Largest holders

  • Sowell Investments Holding Co., LLC23.53%
  • Robert Ritchie9.62%
  • Boston Partners Global Investors, Inc.7.79%
  • Wasatch Advisors LP6.43%
  • Mink Brook Asset Management LLC4.99%
  • BlackRock4.53%
  • Pacific Ridge Capital Partners, LLC2.96%
  • Vanguard Capital Management, LLC2.60%

By investor type

  • Mutual Fund39.05%
  • Private Company23.92%
  • Hedge Fund15.21%
  • Individual/Insider14.29%
  • Public Company1.25%
  • Government Pension Fund0.96%
  • Government0.08%
  • Insurance Company0.07%

Reported short interest has risen from 0.92% to 1.17% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

HolderTypePeriodShare changeNew stake
Dimensional Fund Advisors Mutual Fund 2026/Q3 +32,923 0.2%
Pacific Ridge Capital Partners, LLC Mutual Fund 2026/Q3 +190,024 3.0%
Algert Global LLC Hedge Fund 2026/Q3 +155,356 0.8%
BlackRock Mutual Fund 2026/Q3 +138,225 4.5%
Mink Brook Asset Management LLC Hedge Fund 2026/Q3 +135,531 5.0%
Donald Smith & Co., Inc. Mutual Fund 2026/Q3 +116,420 0.6%
American Century Investment Management Mutual Fund 2026/Q3 +85,753 1.4%
Lighthouse Investment Partners, LLC Hedge Fund 2026/Q3 +74,058 0.4%
Wasatch Advisors LP Mutual Fund 2026/Q3 +67,977 6.4%
Boston Partners Global Investors, Inc. Mutual Fund 2026/Q3 +58,792 7.8%
Marshall Wace LLP Hedge Fund 2026/Q3 +36,345 0.5%
State Street Global Advisors Mutual Fund 2026/Q3 +29,551 1.1%
Geode Capital Management, LLC Mutual Fund 2026/Q3 +28,419 1.5%
R Squared Ltd Mutual Fund 2026/Q3 +22,388 0.1%
Bridgeway Capital Management, LLC Mutual Fund 2026/Q3 +22,027 0.1%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

DateInsiderTitleTransactionSharesPriceHeld after
29 Sep 2026 Steven Mathis Independent Director Other Acquisition +580 – 7,576
29 Sep 2026 Steven Smathers Independent Director Other Acquisition +580 – 179,277
29 Sep 2026 Ernest Csiszar Independent Director Other Acquisition +580 – 4,576
16 Sep 2026 Steve Biggs Chief Accounting Officer Other Acquisition +4,820 – 4,820
30 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -9,174 $25.92 1,883,997
27 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -6,000 $26.50 1,893,171
26 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -64,365 $26.63 1,899,171
24 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -110,461 $26.30 1,963,536
20 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -59,614 $26.30 2,073,997
18 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -18,000 $25.34 2,133,611
16 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -75,402 $24.92 2,151,611
12 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -88,260 $24.60 2,227,013
9 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -5,800 $20.72 2,315,273
6 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -49,924 $21.01 2,321,073
3 Aug 2026 Robert Ritchie Chief Executive Officer Automatic Disposition -63,000 $20.85 2,370,997
2 Aug 2026 Robert Ritchie Chief Executive Officer Intent to Sell (Form 144) -775,000 $21.00 –
29 Jun 2026 Steven Mathis Independent Director Other Acquisition +870 – 6,996
29 Jun 2026 Steven Smathers Independent Director Other Acquisition +870 – 178,697
29 Jun 2026 Ernest Csiszar Independent Director Other Acquisition +870 – 3,996
8 Jun 2026 Sowell Investments Holding Co., LLC Open Market Acquisition +136,356 $16.92 4,610,180

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 229,025 1.2% 1.1
31 Aug 2026 169,672 0.9% 1.0
14 Aug 2026 175,848 0.9% 1.0
31 Jul 2026 254,301 1.3% 3.0
15 Jul 2026 309,442 1.6% 3.7
30 Jun 2026 180,264 0.9% 1.0

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