Canonical: https://ownershiptrace.com/13f/companies/1434

# Who owns WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)? Elite investor 13F holders

3 tracked elite investors reported holding WHITE MOUNTAINS INSURANCE GROUP LTD as of 2026-06-30, including Southeastern Asset Management, Gotham Asset Management, D.E. Shaw. Who bought, trimmed or exited each quarter, with links to the original SEC 13F filings.

3 tracked investors currently reported holding · Latest report period: 2026-06-30 · Financials · Insurance

White Mountains Insurance Group, Ltd. provides insurance services in the United States, the United Kingdom, Bermuda, and internationally. It operates through Ark/WM Outrigger, HG Global, Kudu, Distinguished, and Other Operations segments. The company offers property insurance and reinsurance; specialty insurance and reinsurance consisting of aviation, contingency, cyber, fine art and specie,…

## Reported holders and securities, including exits (up to 20)

| Investor | Security | Instrument | Report period | Filed | Value | Quantity | Units | Change | Source |
|  --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| [Southeastern Asset Management](https://ownershiptrace.com/13f/investors/55) | WHITE MTNS INS GROUP LTD | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 35463263.00 USD | 17104.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/807985/0001398344-26-014641-index.html) |
| [Gotham Asset Management](https://ownershiptrace.com/13f/investors/94672) | WHITE MTNS INS GROUP LTD | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 37196617.00 USD | 17940.000000 | Shares | add | [Original filing](https://www.sec.gov/Archives/edgar/data/1510387/0001398344-26-014644-index.html) |
| [D.E. Shaw](https://ownershiptrace.com/13f/investors/98) | WHITE MTNS INS GROUP LTD | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 13721695.00 USD | 6618.000000 | Shares | reduce | [Original filing](https://www.sec.gov/Archives/edgar/data/1009207/0001104659-26-097217-index.html) |
| [Renaissance Technologies LLC](https://ownershiptrace.com/13f/investors/63) | WHITE MTNS INS GROUP LTD | SHARE | 2026-06-30 | 2026-08-13 00:00:00 | 0.00 USD | 0.000000 | Shares | exited | [Original filing](https://www.sec.gov/Archives/edgar/data/1037389/0001037389-26-000059-index.html) |
| [Bridgewater Associates](https://ownershiptrace.com/13f/investors/8) | WHITE MTNS INS GROUP LTD | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 0.00 USD | 0.000000 | Shares | exited | [Original filing](https://www.sec.gov/Archives/edgar/data/1350694/0001350694-26-000003-index.html) |
| [Ancora Advisors / Ancora Holdings](https://ownershiptrace.com/13f/investors/101) | WHITE MTNS INS GROUP LTD | SHARE | 2026-06-30 | 2026-08-14 00:00:00 | 0.00 USD | 0.000000 | Shares | exited | [Original filing](https://www.sec.gov/Archives/edgar/data/1446114/0001446114-26-000012-index.html) |

Public disclosures can be delayed, incomplete, or amended. Report period describes a position date; transaction date describes a reported transaction; filed describes submission. A recent filing or page update does not establish a current holding. A dash means unavailable or not comparable, not zero.

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