WHITE MOUNTAINS INSURANCE GP WTM
$2,174
+5.3% 52w: $1,650 – $2,319
Latest 13F among current holders filed 11 days ago (Jun 24, 2026)
Price — last 12 months
research preview data1,6501,9852,319
Jun 20, 2025 Jul 2, 2026
Institutional holders
367
+15 QoQ
13F value
$4.85B
-1.2% QoQ
Smart-money holders
19
signal tier ≥ 2
New smart buyers
1
Q1 2026
Institutional value by quarter
Number of holders
Who owns WTM?
Q1 2026 filings| Fund | Type | Shares | Value | % of fund | Change |
|---|---|---|---|---|---|
| DIMENSIONAL FUND ADVISORS LP | Quant stat arb | 156.6K | $344.1M | 0.1% | 0.0% |
| NEUBERGER BERMAN GROUP LLC | Diversified mechanical | 124.7K | $274.0M | 0.2% | -3.8% |
| River Road Asset Management, LLC | Other | 120.5K | $264.8M | 3.0% | -0.3% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | Diversified mechanical | 115.6K | $253.9M | 0.0% | — |
| BlackRock, Inc. | Index provider | 113.3K | $249.0M | 0.0% | +0.9% |
| VANGUARD CAPITAL MANAGEMENT LLC | Diversified mechanical | 109.2K | $239.8M | 0.0% | — |
| COOKE & BIELER LP | Other | 104.9K | $230.4M | 2.6% | -1.6% |
| FULLER & THALER ASSET MANAGEMENT, INC. | Other | 104.6K | $229.7M | 0.8% | -51.7% |
| FIDUCIARY MANAGEMENT INC /WI/ | Other | 85.1K | $186.9M | 2.3% | -5.8% |
| Wallace Capital Management Inc. ★2 | Fundamental diversified | 78.8K | $173.1M | 19.9% | -1.9% |
| MORGAN STANLEY | Bank broker | 59.3K | $130.3M | 0.0% | -27.8% |
| Boston Partners | Other | 57.5K | $126.2M | 0.1% | -25.3% |
| LONDON CO OF VIRGINIA | Other | 57.1K | $125.5M | 0.8% | -2.7% |
| STATE STREET CORP | Index provider | 49.2K | $108.0M | 0.0% | -3.0% |
| GEODE CAPITAL MANAGEMENT, LLC | Index provider | 42.1K | $92.6M | 0.0% | +1.4% |
| T. Rowe Price Investment Management, Inc. | Long only active | 41.5K | $91.2M | 0.1% | -19.0% |
| GENDELL JEFFREY L ★2 | Fundamental diversified | 37.8K | $83.1M | 1.1% | +16.3% |
| REINHART PARTNERS, LLC. ★2 | Fundamental diversified | 37.4K | $82.1M | 2.4% | -15.0% |
| LORD, ABBETT & CO. LLC | Other | 33.1K | $72.7M | 0.2% | -2.0% |
| BANK OF AMERICA CORP /DE/ | Bank broker | 28.4K | $62.3M | 0.0% | -1.6% |
| Cannell & Spears LLC | Other | 28.0K | $61.6M | 1.2% | -0.3% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Index provider | 24.2K | $53.3M | 0.0% | +4.3% |
| RAYMOND JAMES FINANCIAL INC | Bank broker | 24.0K | $52.6M | 0.0% | -0.1% |
| Mraz, Amerine & Associates, Inc. ★2 | Fundamental diversified | 22.2K | $48.7M | 7.2% | -2.0% |
| SOUTHEASTERN ASSET MANAGEMENT INC/TN/ ★3 | Fundamental concentrated | 18.9K | $41.4M | 2.0% | -40.4% |
| Allspring Global Investments Holdings, LLC | Diversified mechanical | 18.6K | $40.5M | 0.1% | -7.8% |
| BROWN ADVISORY INC | Diversified mechanical | 17.8K | $39.2M | 0.1% | -5.9% |
| GOLDMAN SACHS GROUP INC | Bank broker | 15.8K | $34.7M | 0.0% | +200.1% |
| ENVESTNET ASSET MANAGEMENT INC | Wealth advisor | 15.6K | $34.2M | 0.0% | -1.5% |
| NORTHERN TRUST CORP | Index provider | 15.5K | $34.0M | 0.0% | -7.0% |
| VANGUARD FIDUCIARY TRUST CO | Diversified mechanical | 15.2K | $33.4M | 0.0% | — |
| WELLINGTON MANAGEMENT GROUP LLP | Long only active | 14.9K | $32.7M | 0.0% | -6.6% |
| Boussard & Gavaudan Investment Management LLP ★2 | Fundamental diversified | 14.0K | $31.0M | 3.0% | New |
| JANE STREET GROUP, LLC | Market maker | 13.8K | $30.3M | 0.0% | +708.9% |
| HORIZON KINETICS ASSET MANAGEMENT LLC | Other | 13.1K | $28.8M | 0.3% | -0.1% |
| ELKHORN PARTNERS LIMITED PARTNERSHIP ★3 | Fundamental concentrated | 12.7K | $27.9M | 17.8% | -6.6% |
| VICTORY CAPITAL MANAGEMENT INC | Diversified mechanical | 11.1K | $24.5M | 0.0% | +77.0% |
| SEI INVESTMENTS CO | Diversified mechanical | 11.1K | $24.4M | 0.0% | +40.2% |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Market maker | 11.0K | $24.1M | 0.0% | +8206.8% |
| Select Equity Group, L.P. ★2 | Fundamental diversified | 10.6K | $23.2M | 0.1% | -46.4% |
| UBS Group AG | Bank broker | 10.4K | $22.9M | 0.0% | +74.0% |
| Quantinno Capital Management LP | Diversified mechanical | 9.8K | $21.5M | 0.0% | +34.6% |
| SPEECE THORSON CAPITAL GROUP INC ★2 | Fundamental diversified | 9.4K | $20.6M | 4.7% | -11.9% |
| Gotham Asset Management, LLC | Diversified mechanical | 9.0K | $19.9M | 0.1% | +34.7% |
| D. E. Shaw & Co., Inc. | Quant stat arb | 8.9K | $19.6M | 0.0% | +3.7% |
| WELLS FARGO & COMPANY/MN | Bank broker | 8.8K | $19.3M | 0.0% | -3.9% |
| Bank of New York Mellon Corp | Diversified mechanical | 8.4K | $18.6M | 0.0% | -4.4% |
| AMERICAN CENTURY COMPANIES INC | Diversified mechanical | 8.3K | $18.3M | 0.0% | +828.3% |
| GW&K Investment Management, LLC | Other | 7.9K | $17.4M | 0.2% | -8.1% |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Bank broker | 7.8K | $17.2M | 0.0% | +2.2% |
Exits are not a bearish signal: our backtest shows stocks specialists exit keep outperforming for 3+ quarters — selling usually means profit-taking, not a forecast.
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