White Mountains Insurance Group
WTM
2,031.50
-5.75
-0.28%
White Mountains Insurance Group
US · WTM
#2154 by market cap
Listed 1970
2,031.50
-5.75
-0.28%
Live - 5344 symbols - heartbeat 370s ago
· 2026-10-08 08:05
Pre-market
2,039.70
+0.40%
After-hours
2,031.50
0.00%
- Market cap
- 4.85B
- P/E (TTM)i
- 4.65
- P/Bi
- 0.90
- EPSi
- 430.14
- Div yieldi
- 0.05%
- 52W posi
- 40%
Reader sentiment
Are you bullish or bearish on WTM?
Anonymous reader poll. Unscientific, not investment advice.
✦ Quant Ownership Signal how this is computed
Distributing
- The number of reporting institutions decreased by 2 in the most recent period (2026/Q3).
- Total institutional ownership fell 0.2 percentage points.
Institutional ownership
- Held by institutions
- 97.30% -0.17pp
- Institutions
- 409 -2
- As of
- 2026/Q3 vs. prior period
Ownership vs. money flow
DivergingInstitutions trimmed shares last reporting period, and the stock has seen net inflows in main-fund flow over the last 20 trading sessions - the two are pointing in different directions.
Institutional ownership changes are reported quarterly with a lag; fund-flow data is daily. Treat this as a directional cross-check, not a precise timing signal.
Holder types
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%
Family Office/Trust0.21%
Top holders as of 2026-06-30
Dimensional Fund Advisors
6.75% · 158.95K sh
Vanguard Capital Management, LLC
5.21% · 122.80K sh
Neuberger Berman Investment Advisers LLC
5.06% · 119.14K sh
BlackRock
5.01% · 117.87K sh
River Road Asset Management, LLC
4.92% · 115.88K sh
Vanguard Portfolio Management, LLC
4.75% · 111.97K sh
Fuller & Thaler Asset Management, Inc.
4.33% · 101.89K sh
Cooke & Bieler, L.P.
3.61% · 85.12K sh
Wallace Capital Management, Inc.
3.40% · 80.07K sh
Fiduciary Management, Inc.
2.83% · 66.55K sh
Bar length is relative to the largest holder shown here, not to 100% of the company.
Insiders
50 filings tracked · 29 buys · 18 sells
| Name | Role | Stake |
|---|---|---|
| Robert Seelig | Executive VP, General Counsel & Investor Relation | 0.89% |
| George Rountree | Chief Executive Officer | 0.79% |
| Reid Campbell | President | 0.45% |
| Liam Caffrey | Chief Financial Officer | 0.23% |
| Michaela Hildreth | MD & Chief Accounting Officer | 0.18% |
| Weston Hicks | Independent Chairperson | 0.12% |
| Giles Harrison | Chief Strategy Officer | 0.11% |
| David Tanner | Independent Deputy Chairman | 0.09% |
| Mary Choksi | Independent Director | 0.08% |
| Michael Papamichael | MD & Deputy CFO | 0.08% |
Insider transactions most recent Form 4 filings
| Date | Name | Role | Type | Shares | Price |
|---|---|---|---|---|---|
| 2026-08-30 | David Tanner | Independent Deputy Chairman | Other Disposition | -2 | -- |
| 2026-08-25 | Steve Klar | -- | Other Acquisition | +113 | -- |
| 2026-08-25 | Steve Klar | -- | Initial Statement of Beneficial | 0 | -- |
| 2026-05-20 | David Tanner | Independent Deputy Chairman | Other Acquisition | +135 | -- |
| 2026-05-20 | Reid Campbell | President | Other Acquisition | +135 | -- |
| 2026-05-20 | Mary Choksi | Independent Director | Other Acquisition | +135 | -- |
| 2026-05-20 | Weston Hicks | Independent Chairperson | Other Acquisition | +190 | -- |
| 2026-05-20 | Philip Gelston | Independent Director | Other Acquisition | +135 | -- |
| 2026-05-20 | Peter Carlson | Independent Director | Other Acquisition | +135 | -- |
| 2026-05-20 | Suzanne Shank-Werdlow | Independent Director | Other Acquisition | +135 | -- |
| 2026-05-20 | John Chu | Director | Other Acquisition | +135 | -- |
| 2026-05-20 | John Chu | Director | Initial Statement of Beneficial | 0 | -- |
| 2026-05-20 | Margaret Dillon | Independent Director | Other Acquisition | +135 | -- |
| 2026-03-18 | Robert Seelig | Executive VP, General Counsel & Investor Relation | Other Disposition | -50 | -- |
| 2026-03-03 | David Tanner | Independent Deputy Chairman | Other Disposition | -225 | -- |
| 2026-02-24 | Robert Seelig | Executive VP, General Counsel & Investor Relation | Other Acquisition | +775 | -- |
| 2026-02-24 | Giles Harrison | Chief Strategy Officer | Other Acquisition | +775 | -- |
| 2026-02-24 | Liam Caffrey | Chief Financial Officer | Other Acquisition | +1,500 | -- |
| 2026-02-24 | Michael Papamichael | MD & Deputy CFO | Other Acquisition | +500 | -- |
| 2026-02-24 | Michaela Hildreth | MD & Chief Accounting Officer | Other Acquisition | +600 | -- |
Form 4 filings, most recent per company. "Other Derivative Acquisition" rows are mostly RSU/option vesting, not open-market buying - the Type column says which.
Quote time 2026-10-08 08:05:40 · For reference only, not investment advice and not tailored to your situation.