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White Mountains Insurance Group WTM

US equityMarket cap rank #2135
$2,019.44 −$1.48 (-0.07%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $2,019.44 0.00%
Open$2,031.81
Prev close$2,020.92
Day range$2,019.44 – $2,046.09
Volume20.4K
Market cap$4.82B
P/E (TTM)4.6
Dividend yield0.05%

Ownership & positioning

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

Institutional ownership97.3%-0.17 pts vs. prior quarter
Institutions holding409-2 vs. prior quarter
Insider trades (recent)29 buys / 18 sellsNet buying
Short interest5.67% of floatDays to cover 6.2 · as of 15 Sep 2026
Short-sale volume share25.2%5-day average of daily volume

Short-sale volume as % of daily volume

18%24%31%38%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: +$3.03M (8 inflow days, 12 outflow days).

The five largest holders on file together own 26.9% of shares outstanding.

Largest holders

  • Dimensional Fund Advisors6.75%
  • Vanguard Capital Management, LLC5.21%
  • Neuberger Berman Investment Advisers LLC5.06%
  • BlackRock5.01%
  • River Road Asset Management, LLC4.92%
  • Vanguard Portfolio Management, LLC4.75%
  • Fuller & Thaler Asset Management, Inc.4.33%
  • Cooke & Bieler, L.P.3.61%

By investor type

  • Mutual Fund85.49%
  • Hedge Fund5.47%
  • Individual/Insider3.27%
  • Public Company2.42%
  • Private Company1.44%
  • Sovereign Wealth Fund1.19%
  • Government Pension Fund0.79%
  • Insurance Company0.23%

Reported short interest has risen from 5.04% to 5.67% 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 135,407 5.7% 6.2
31 Aug 2026 131,685 5.5% 6.5
14 Aug 2026 136,316 5.7% 5.7
31 Jul 2026 136,979 5.5% 8.5
15 Jul 2026 138,306 5.6% 7.4
30 Jun 2026 124,761 5.0% 6.9

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