§ INSURANCE
USD · InsuranceWTM
WHITE MOUNTAINS INSURANCE GP
USDSector · InsuranceBeta · 0.36
§ 01 · PRICE
Price action
1D5D1M6MYTD1YMAX
§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
13F FLOW
142 increased/new, 142 decreased/exited (13F)
AC 13F Analysis
§ 04 · FUNDAMENTALS · THE BOOKS
| P/E | 5.1 | P/B | 0.95 |
| EPS (TTM) | 437.98 | Dividend | 0.05% |
§ 05 · WHO OWNS IT
Top institutional holders
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| Dimensional Fund Advisors | 157K | 0.1% | +0% |
| NEUBERGER BERMAN GROUP LLC | 125K | 0.2% | −4% |
| River Road Asset Management, LLC | 121K | 3.0% | −0% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 116K | n/a | n/a |
| BlackRock, Inc. | 113K | 0.0% | +1% |
| VANGUARD CAPITAL MANAGEMENT LLC | 109K | n/a | n/a |
◇ AC INTELLIGENCE
Top institutional owners for WTM as of the most recent 13F reporting period (Q1 2026 · Period ended Mar 31). Δ Q/Q reflects share-count change vs. the prior filing — positive green means adding, negative red means trimming. Cross-reference with the ownership-mix bars below to see which strategy cohort is driving the flow.
§ 06 · WHO OWNS IT · BY STRATEGY
OTHER3.3% · 0 holders
OTHER56.7% · 269 holders
QUALITY / COMPOUNDER14.4% · 21 holders
DEALER / BANK8.9% · 36 holders
PASSIVE / INDEX7.9% · 8 holders
DEEP VALUE6.6% · 3 holders
INCOME / DEFENSIVE0.9% · 17 holders
SYSTEMATIC / QUANT0.8% · 6 holders
ACTIVIST0.4% · 1 holder
TACTICAL / MACRO0.1% · 3 holders
◇ AC INTELLIGENCE
Ownership mix by behavioral cohort. Top bars indicate which style of capital dominates the float — passive indexing, quality compounders, dealer/bank, systematic quant, etc. Big quality-compounder share means concentrated active conviction; heavy passive share means flows are dictated by index rebalances, not fundamentals.
§ 07 · INSIDER ACTIVITY · LAST 180 DAYS
NO INSIDER FILINGS
◇ AC INTELLIGENCE
No Form 4 filings on record for WTM in the last 180 days.
§ 08 · COVERAGE · OUR RECENT NOTES
No notes mention WTM yet.