WTM · White Mountains Insurance Group Ltd · Holdings
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Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Institutional Ownership Trend
Superinvestors Holding WTM
All superinvestors →Holder Concentration
Across 359 13F filersWho Holds WTM
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 358 filers, like-for-like change -1.5%; actively managed books -1.0%; index-like books -3.2%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 62.1% | 188 | -3.1% |
| Exempt adviser | 0.5% | 2 | +74.9% |
| Adviser | 2.3% | 8 | -5.0% |
| Bank | 6.2% | 20 | +3.3% |
| Insurer | 0.0% | 1 | -25.5% |
| Broker-dealer | 0.1% | 1 | -5.5% |
| Benefit plan | 0.3% | 6 | +4.0% |
| Non-US | 1.5% | 8 | -57.0% |
| Holding company | 15.4% | 10 | -5.9% |
| Unknown | 11.8% | 114 | +14.8% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 21.9% | 37 | -3.2% |
| Systematic-like | 1.6% | 13 | +47.8% |
| Concentrated | 11.1% | 76 | +7.5% |
| Diversified active | 65.3% | 232 | -3.0% |
| Unknown | 0.0% | 0 | -100.0% |
| Not measured | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 54.5% | 240 | -2.0% |
| Medium turnover | 29.7% | 68 | -1.2% |
| High turnover | 2.9% | 26 | +11.7% |
| Unknown | 12.9% | 24 | -2.6% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 11.9% | 33 | -2.2% |
| Medium horizon | 8.8% | 56 | -3.8% |
| Long horizon | 72.9% | 260 | -1.5% |
| Unknown | 6.4% | 9 | +3.8% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 7.4% | 77 | +4.1% |
| $1B to $10B | 19.0% | 101 | -8.1% |
| $10B to $100B | 18.4% | 106 | +5.6% |
| $100B or more | 55.3% | 74 | -1.9% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 9.5% | 118 | -0.2% |
| Pooled investment vehicles | 1.0% | 16 | -9.4% |
| Registered funds and BDCs | 35.2% | 22 | -1.6% |
| Pension and profit sharing plans | 0.1% | 4 | -9.0% |
| Insurance companies | 0.0% | 2 | +146.4% |
| Charitable organizations | 0.0% | 1 | -37.5% |
| Governments and sovereign funds | 0.4% | 2 | -5.3% |
| Corporations | 0.0% | 1 | -51.6% |
| Other investment advisers | 0.1% | 5 | +11.1% |
| Diversified | 15.8% | 17 | -7.4% |
| Unknown | 37.9% | 170 | +1.4% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 13.0% | 38 | +6.7% |
| Private equity funds | 0.7% | 10 | -9.2% |
| Venture capital funds | 0.0% | 2 | -7.2% |
| Real estate funds | 0.0% | 4 | +3.6% |
| Securitized asset funds | 0.0% | 1 | -99.2% |
| Other private funds | 11.0% | 21 | +1.0% |
| Mixed private funds | 0.1% | 2 | -69.2% |
| Private funds, type not stated | 5.5% | 3 | -16.2% |
| No private funds | 32.3% | 109 | -3.0% |
| Liquidity funds | 0.0% | 0 | -100.0% |
| Unknown | 37.4% | 168 | +0.9% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 95.8% | 318 | -2.0% |
| Outside the US | 4.2% | 40 | +26.1% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 3 holders with no observed 2026-03-31 13F and 3 holders with no observed 2026-06-30 13F. Compared across CIK changes: 4 filers continue as Evelyn Partners Group Ltd; JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
358 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 23.7% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies WTM's active holders also own, quarter ended Jun 30, 2026| # | Company | Shared holders |
|---|---|---|
| 1 | MAX MediaAlpha, Inc. | 4 |
| 2 | GHC Graham Holdings Co | 8 |
| 3 | NSIT Insight Enterprises Inc | 5 |
| 4 | CACC Credit Acceptance Corp | 5 |
| 5 | CABO Cable One, Inc. | 3 |
| 6 | AGO Assured Guaranty Ltd | 4 |
| 7 | ICUI Icu Medical Inc | 3 |
| 8 | HSIC Henry Schein Inc | 7 |
| 9 | ATR Aptargroup, Inc. | 7 |
| 10 | HHH Howard Hughes Holdings Inc. | 5 |
Shareholder Targets
13F filers that own its peers but not WTM, quarter ended Jun 30, 2026Found through its holder-overlap peers: MAX, GHC, NSIT, CACC, CABO, AGO, ICUI, HSIC, ATR, HHH, FNF, GTES, ENOV, MKL, GLIBA, PPLI, ESAB, BUR, L, UHAL. 1,689 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | PERSHING SQUARE INC. Registered adviser, Concentrated | $1,991,144,055 1 held | HHH |
| 2 | Kohlberg Kravis Roberts & Co. L.P. Registered adviser, Concentrated | $1,307,257,712 1 held | HSIC |
| 3 | WINDACRE PARTNERSHIP LLC Registered adviser, Concentrated | $985,776,048 1 held | FNF |
| 4 | Davis Selected Advisers Registered adviser, Diversified active | $966,635,878 3 held | MKL, PPLI, L |
| 5 | PRINCIPAL FINANCIAL GROUP INC Insurer, Diversified active | $950,482,361 17 held | MKL, FNF, AGO |
| 6 | Prescott General Partners LLC Adviser, Concentrated | $914,964,179 1 held | CACC |
| 7 | Select Equity Group, L.P. Registered adviser, Diversified active | $647,772,403 1 held | MKL |
| 8 | STATE FARM MUTUAL AUTOMOBILE INSURANCE CO Insurer, Diversified active | $594,019,412 1 held | ATR |
| 9 | Artisan Partners Limited Partnership Registered adviser, Diversified active | $576,085,593 2 held | HSIC, UHAL |
| 10 | Madison Avenue Partners, LP Registered adviser, Concentrated | $500,581,210 2 held | GHC, MKL |
Fund Ownership of WTM by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 9.55% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 0.51% | 12,231 |
| Index ETFs | 9.04% | 215,701 |
| Active ETFs | 1.97% | 46,909 |
| Active funds | 3.98% | 95,108 |
| Unclassified | 1.19% | 28,383 |
| All registered funds | 16.69% | 398,332 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $322,236,272 | 7.06% | 160,597 | Shares | 2026-11-04 | |
| Mega NEUBERGER BERMAN GROUP LLC Holding company | $247,025,745 | 5.41% | 119,141 | Shares | 2026-10-27 | |
| Mega BlackRock, Inc. Holding company | $244,392,534 | 5.36% | 117,871 | Shares | 2026-08-07 | |
| Mid River Road Asset Management, LLC Registered adviser | $240,264,421 | 5.27% | 115,880 | Shares | 2026-07-17 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $232,155,393 | 5.09% | 111,969 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $222,845,873 | 4.88% | 107,479 | Shares | 2026-08-13 | |
| Large FULLER & THALER ASSET MANAGEMENT, INC. Registered adviser | $211,261,843 | 4.63% | 101,892 | Shares | 2026-08-12 | |
| Mid COOKE & BIELER LP Registered adviser | $174,971,947 | 3.83% | 87,203 | Shares | 2026-10-21 | |
| Small Wallace Capital Management Inc. Registered adviser | $166,010,109 | 3.64% | 80,067 | Shares | 2026-08-14 | |
| Mid FIDUCIARY MANAGEMENT INC /WI/ Registered adviser | $137,984,097 | 3.02% | 66,550 | Shares | 2026-08-13 | |
| Large GENDELL JEFFREY L | $122,833,837 | 2.69% | 59,243 | Shares | 2026-08-14 | |
| Mega Boston Partners Registered adviser | $115,216,202 | 2.53% | 55,569 | Shares | 2026-08-04 | |
| Large LONDON CO OF VIRGINIA Registered adviser | $112,014,889 | 2.46% | 54,025 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $104,202,356 | 2.28% | 50,257 | Shares | 2026-09-22 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $102,450,341 | 2.25% | 49,412 | Shares | 2026-08-12 | |
| Mega MORGAN STANLEY Holding company | $97,171,483 | 2.13% | 46,866 | Shares | 2026-08-13 | |
| Mid REINHART PARTNERS, LLC. Registered adviser | $88,203,293 | 1.93% | 43,959 | Shares | 2026-10-09 | |
| Mega T. Rowe Price Investment Management, Inc. Adviser | $70,986,650 | 1.56% | 34,237 | Shares | 2026-08-14 | |
| Large LORD, ABBETT & CO. LLC Registered adviser | $68,067,317 | 1.49% | 32,829 | Shares | 2026-08-14 | |
| Mega AMERICAN CENTURY COMPANIES INC | $64,499,013 | 1.41% | 31,108 | Shares | 2026-08-12 | |
| Mega NORGES BANK Non-US | $57,963,688 | 1.27% | 27,956 | Shares | 2026-08-12 | |
| Mid Cannell & Spears LLC Registered adviser | $57,177,873 | 1.25% | 27,577 | Shares | 2026-08-11 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $51,892,799 | 1.14% | 25,028 | Shares | 2026-08-14 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $48,735,029 | 1.07% | 23,505 | Shares | 2026-08-14 | |
| Small Mraz, Amerine & Associates, Inc. Registered adviser | $44,437,734 | 0.97% | 22,147 | Shares | 2026-10-30 | |
| Large Allspring Global Investments Holdings, LLC Holding company | $40,589,284 | 0.89% | 20,229 | Shares | 2026-11-04 | |
| Large Gotham Asset Management, LLC Registered adviser | $37,196,614 | 0.82% | 17,940 | Shares | 2026-08-14 | |
| Large BROWN ADVISORY INC | $36,744,615 | 0.81% | 17,722 | Shares | 2026-08-14 | |
| Mega JANE STREET GROUP, LLC | $35,716,213 | 0.78% | 17,226 | Shares | 2026-08-14 | |
| Mid SOUTHEASTERN ASSET MANAGEMENT INC/TN/ Registered adviser | $35,463,260 | 0.78% | 17,104 | Shares | 2026-08-14 | |
| Mega UBS Group AG Bank | $33,584,768 | 0.74% | 16,198 | Shares | 2026-08-13 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $31,762,259 | 0.70% | 15,319 | Shares | 2026-08-13 | |
| Mega RAYMOND JAMES FINANCIAL INC | $30,754,590 | 0.67% | 14,833 | Shares | 2026-08-14 | |
| Mega NORTHERN TRUST CORP Bank | $30,211,362 | 0.66% | 14,571 | Shares | 2026-08-13 | |
| Mega WELLINGTON MANAGEMENT GROUP LLP Holding company | $30,130,501 | 0.66% | 14,532 | Shares | 2026-08-14 | |
| Mega ENVESTNET ASSET MANAGEMENT INC Registered adviser | $28,691,569 | 0.63% | 13,838 | Shares | 2026-09-23 | |
| Large Quantinno Capital Management LP Registered adviser | $26,174,474 | 0.57% | 12,624 | Shares | 2026-08-13 | |
| Small ELKHORN PARTNERS LIMITED PARTNERSHIP | $25,544,163 | 0.56% | 12,320 | Shares | 2026-08-13 | |
| Mid HORIZON KINETICS ASSET MANAGEMENT LLC Registered adviser | $25,307,797 | 0.55% | 12,206 | Shares | 2026-08-11 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $25,193,759 | 0.55% | 12,151 | Shares | 2026-08-14 | |
| Small BOUSSARD & GAVAUDAN GESTION SAS | $24,215,120 | 0.53% | 11,679 | Shares | 2026-08-19 | |
| Mega VICTORY CAPITAL MANAGEMENT INC Registered adviser | $22,152,097 | 0.49% | 10,684 | Shares | 2026-08-07 | |
| Mega FIRST TRUST ADVISORS LP Registered adviser | $21,986,226 | 0.48% | 10,604 | Shares | 2026-08-11 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $20,055,900 | 0.44% | 9,673 | Shares | 2026-08-14 | |
| Small SPEECE THORSON CAPITAL GROUP INC Registered adviser | $19,106,287 | 0.42% | 9,215 | Shares | 2026-08-04 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $18,059,224 | 0.40% | 8,710 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO Holding company | $16,811,044 | 0.37% | 8,108 | Shares | 2026-08-14 | |
| Large GW&K Investment Management, LLC Registered adviser | $16,253,303 | 0.36% | 7,839 | Shares | 2026-08-12 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $15,102,572 | 0.33% | 7,284 | Shares | 2026-08-13 | |
| Mega Bank of New York Mellon Corp Bank | $14,984,462 | 0.33% | 7,468 | Shares | 2026-11-05 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $14,795,709 | 0.32% | 7,136 | Shares | 2026-09-02 | |
| Mid THOMPSON SIEGEL & WALMSLEY LLC Registered adviser | $14,494,883 | 0.32% | 7,224 | Shares | 2026-11-05 | |
| Large HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC Registered adviser | $14,074,170 | 0.31% | 6,788 | Shares | 2026-08-14 | |
| Large ROYCE & ASSOCIATES LP Registered adviser | $14,059,656 | 0.31% | 6,781 | Shares | 2026-08-14 | |
| Large HRT FINANCIAL LP | $14,016,115 | 0.31% | 6,760 | Shares | 2026-08-14 | |
| Mega D. E. Shaw & Co., Inc. | $13,721,693 | 0.30% | 6,618 | Shares | 2026-08-14 | |
| Mid Edgestream Partners, L.P. | $13,638,758 | 0.30% | 6,578 | Shares | 2026-08-11 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $11,299,971 | 0.25% | 5,450 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $11,217,036 | 0.25% | 5,410 | Shares | 2026-08-12 | |
| Mega California Public Employees Retirement System | $10,881,150 | 0.24% | 5,248 | Shares | 2026-08-14 | |
| Mid Williams Jones Wealth Management, LLC. Registered adviser | $10,419,702 | 0.23% | 5,193 | Shares | 2026-11-05 | |
| Mega Swiss National Bank | $10,006,179 | 0.22% | 4,826 | Shares | 2026-08-11 | |
| Small WINMILL & CO. INC Adviser | $9,952,271 | 0.22% | 4,800 | Shares | 2026-08-13 | |
| Mega FRANKLIN RESOURCES INC Adviser | $8,662,621 | 0.19% | 4,178 | Shares | 2026-08-13 | |
| Small Phocas Financial Corp. Registered adviser | $8,455,284 | 0.19% | 4,078 | Shares | 2026-07-31 | |
| Mega Creative Planning Registered adviser | $8,242,660 | 0.18% | 4,108 | Shares | 2026-11-02 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $8,082,073 | 0.18% | 3,898 | Shares | 2026-08-12 | |
| Mega Nuveen, LLC | $7,628,000 | 0.17% | 3,679 | Shares | 2026-08-11 | |
| Mega Invesco Ltd. Adviser | $7,250,641 | 0.16% | 3,497 | Shares | 2026-08-14 | |
| Mid LEE DANNER & BASS INC Registered adviser | $6,527,111 | 0.14% | 3,253 | Shares | 2026-10-27 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $5,913,306 | 0.13% | 2,852 | Shares | 2026-08-14 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $5,724,629 | 0.13% | 2,761 | Shares | 2026-08-24 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $5,249,823 | 0.12% | 2,532 | Shares | 2026-07-29 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $4,959,548 | 0.11% | 2,392 | Shares | 2026-08-13 | |
| Mega Russell Investments Group, Ltd. | $4,911,858 | 0.11% | 2,369 | Shares | 2026-08-06 | |
| Large STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM Benefit plan | $4,874,539 | 0.11% | 2,351 | Shares | 2026-08-10 | |
| Micro Triad Investment Management Registered adviser | $4,847,679 | 0.11% | 2,416 | Shares | 2026-10-13 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $4,841,365 | 0.11% | 2,335 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $4,679,639 | 0.10% | 2,257 | Shares | 2026-08-14 | |
| Small Regency Capital Management Inc.\DE | $4,449,494 | 0.10% | 2,146 | Shares | 2026-08-13 | |
| Large Robeco Institutional Asset Management B.V. | $4,360,102 | 0.10% | 2,173 | Shares | 2026-10-20 | |
| Large DAVENPORT & Co LLC Registered adviser | $4,207,609 | 0.09% | 2,097 | Shares | 2026-10-14 | |
| Mid BRADLEY FOSTER & SARGENT INC/CT | $3,937,367 | 0.09% | 1,899 | Shares | 2026-08-14 | |
| Mid Lighthouse Investment Partners, LLC Registered adviser | $3,873,092 | 0.08% | 1,868 | Shares | 2026-08-14 | |
| Mid PARSONS CAPITAL MANAGEMENT INC/RI Registered adviser | $3,746,116 | 0.08% | 1,867 | Shares | 2026-10-28 | |
| Large Cerity Partners LLC Registered adviser | $3,725,880 | 0.08% | 1,797 | Shares | 2026-08-14 | |
| Mid Atlantic Union Bankshares Corp Bank | $3,659,533 | 0.08% | 1,765 | Shares | 2026-08-11 | |
| Large MML INVESTORS SERVICES, LLC | $3,609,771 | 0.08% | 1,741 | Shares | 2026-08-07 | |
| Mid XTX Topco Ltd | $3,408,652 | 0.07% | 1,644 | Shares | 2026-08-14 | |
| Large Tidal Investments LLC Registered adviser | $3,271,809 | 0.07% | 1,578 | Shares | 2026-08-13 | |
| Large Focus Partners Wealth Registered adviser | $3,219,974 | 0.07% | 1,553 | Shares | 2026-08-12 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $2,991,901 | 0.07% | 1,443 | Shares | 2026-08-14 | |
| Mid OPPENHEIMER ASSET MANAGEMENT INC. | $2,959,572 | 0.06% | 1,475 | Shares | 2026-10-27 | |
| Large AGF MANAGEMENT LTD | $2,877,305 | 0.06% | 1,434 | Shares | 2026-11-03 | |
| Mega LPL Financial LLC Broker-dealer | $2,732,727 | 0.06% | 1,318 | Shares | 2026-08-07 | |
| Mega HighTower Advisors, LLC Registered adviser | $2,728,581 | 0.06% | 1,316 | Shares | 2026-08-05 | |
| Mega ROYAL BANK OF CANADA Bank | $2,564,782 | 0.06% | 1,237 | Shares | 2026-08-14 | |
| Mega STIFEL FINANCIAL CORP | $2,560,635 | 0.06% | 1,235 | Shares | 2026-08-12 | |
| Mid LEUTHOLD GROUP, LLC Registered adviser | $2,510,118 | 0.06% | 1,251 | Shares | 2026-11-04 | |
| Large WCM INVESTMENT MANAGEMENT, LLC Registered adviser | $2,481,847 | 0.05% | 1,197 | Shares | 2026-08-13 |
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