White Mtns Ins Group Ltd
Held by 2 superinvestors (G9618E107).
Educational data only — not investment advice. 13F positions are self-reported and can lag up to 45 days.
White Mtns Ins Group Ltd (G9618E107) is held by 2 of the superinvestors tracked on Compounder, with a combined $42.4M in reported 13F value. The largest position belongs to Mason Hawkins, where it makes up 2.0% of the portfolio.
Other notable holders by value include Ray Dalio (0.0% of its book).
Over the latest quarter, 1 of the tracked filers opened a new position in G9618E107, 0 added to existing ones, 1 trimmed, and 0 sold out entirely.
Holder counts and values reflect the most recent SEC Form 13F filings, through the quarter ended 2026-03-31. Source: SEC EDGAR. A 13F shows only long US-listed positions and can lag the real portfolio by up to 45 days, so this is disclosed long ownership, not a complete picture.
Superinvestors holding this security over the last 8 quarters: 2 → 2.
Early quarters may understate holder counts due to data backfill — read the slope with care.
- Value$41.4MWeight (prev→now)2.9% → 2.0% ▼
- Value$909,541Weight (prev→now)New · 0.0%
Sources· SEC EDGAR 13F as of 2026-05-15
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