WHITE MTNS INS GROUP LTD (G9618E107) Institutional Ownership and Insiders Activity

WHITE MTNS INS GROUP LTD (G9618E107) is widely held by institutional investors, with 3 tracked firms reporting positions valued at approximately $48.86M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Longleaf Partners is the largest disclosed holder, reporting approximately $41.44M in G9618E107 holdings in its latest filing.

Institutional ownership among tracked investors remains highly concentrated, with Longleaf Partners representing the majority of disclosed value.