WHITE MOUNTAINS INSURANCE GROUP LTD

CIK 0000776867 · Q1 2026

13F Equity AUM

$313.4M

+19.6% QoQ

Positions

0 QoQ

AUM Rank

#5,749

Top 46%

Skill Alpha (FF)

-14.2%/yr^ns

No Clear Edge

vs S&P -20.5%/yr (unadj.)

Quarters Tracked

~8 years

Portfolio Concentration

Top 5: 100.0%Top 10: 100.0%Top 20: 100.0%

MAX53.0%

SPY47.0%

HHI (Herfindahl-Hirschman Index) measures portfolio concentration. Low (<1500) = diversified, Moderate (1500-2500), High (>2500) = concentrated bets.

Sector Allocation

Communication Services53.0%

Financial Services47.0%

Portfolio weight by GICS sector based on latest 13F filing. Sectors below 2% are grouped as “Other.”

Position Sizing

Positions: 2Median: 50.00%Avg: 50.00%

0–0.5%

0(0.0%)

0.5–1%

0(0.0%)

1–3%

0(0.0%)

3–5%

0(0.0%)

5%+

2(100.0%)

Count of positions per weight bucket — (%) = combined portfolio weight

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Portfolio Overlap

Shared: 2Unique: 0vs 20 funds

0%Low

Fund positions

7,299

Consensus CUSIPs

Jaccard similarity of this fund’s portfolio vs the consensus of top 20 funds by AUM. Low (<15%) = contrarian, Moderate (15-40%), High (>40%) = follows the crowd.

Most Similar Funds

Top 9 benchmark funds with highest portfolio overlap (Jaccard similarity)

0.1%

0.1%

BANK OF AMERICA CORP /DE/

VANGUARD CAPITAL MANAGEMENT LLC

VANGUARD PORTFOLIO MANAGEMENT LLC

FMR LLC

GEODE CAPITAL MANAGEMENT, LLC

Jaccard similarity per fund: shared CUSIPs / (fund A + fund B − shared). Higher values indicate more similar portfolios.

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Position Changes This Quarter

New0Increased1Decreased0Exited0

Increased

SPY47.0%

+182K(+403%)

Quarter-over-quarter changes compared to prior 13F filing. New = first appearance; Exited = no longer held.

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Holdings

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