White Mountains Insurance Group, Ltd. (WTM) — Who Owns This Stock? 13F Breakdown (Q2 2026)

WTM ranks #1749 out of 37696 tracked stocks by institutional interest — one of the most closely watched names in our coverage.

WTM is a top-conviction position for Elkhorn Partners Limited Partnership — at 21.9% of their entire disclosed 13F portfolio, it's one of their largest single bets, not just a passing allocation.

The largest dollar stake in WTM belongs to Dimensional Fund Advisors LP, but the position matters far more to Elkhorn Partners Limited Partnership, who has 21.9% of their own portfolio riding on it — a reminder that the biggest holder by size and the holder with the biggest bet aren't always the same fund.

Wealth Enhancement Advisory Services, LLC has added to its WTM position for two straight quarters, increasing it by $839.6K to reach $1.2M today.

Triad Investment Management has trimmed its WTM position for two straight quarters, cutting it by $11.6M while still holding $4.8M.

WTM is up 0.8% today, and institutions have been net buyers of $3.3B this quarter — today's price move and the underlying institutional flow are pointing the same direction.

WTM posted net income of $1.1B over the trailing twelve months.

• Profitable — net income of $1.1B over the trailing twelve months
• Revenue grew 55.4% year over year
• Net income improved year over year, from $205.4M to $1.1B
• Generated $550.5M in positive operating cash flow
• Liabilities run 1.12x equity — within a conventional range