WHITE MOUNTAINS INSURANCE GROUP LTD

CIK 776867 · View on SEC EDGAR ↗

Portfolio value
$393.6M
#4,403 of 9,443 by 13F value · top 46.6%
Positions
2
As of
June 30, 2026

Portfolio value QoQ: +25.6% 13F does not disclose cash

Top 10 holdings weight
100.00%
Top 25 holdings weight
100.00%
Positions above 1%
2
Effective number of positions
2.0

Based on 13F long-equity holdings only (cash, bonds, shorts not disclosed)

Turnover Q2 2026: 0.0% Est. buys $0 · sells $0

Median holding: 7.0 quarters Tracked Q4 2024–Q2 2026 · 100.0% still held

New positions
0
Increased
0
Decreased
0
Closed
1
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Performance vs S&P 500

Tracked Q4 2024–Q2 2026
+11.6%
S&P 500 total return (same window)
+28.1%
Excess return
-16.5%

Annualized: +7.6% · S&P 500: +18.0%

Approximates a buy-and-hold portfolio built from quarterly SEC 13F snapshots. Excludes cash, short positions, options/derivatives, and non-13(f) securities — reflects the disclosed long-equity book only, not total fund AUM. SEC filing lag is up to 45 days; this is not a real-time-copyable timing.

Priceable coverage: 100.0% · Options excluded: 0.0%

Sector breakdown

Communication Services
57.0%
Other/Unmapped
43.0%

Full portfolio 2 positions

Type Streak 8Q trend
MAX MediaAlpha, Inc. Class A Common Stock $224,457,638 57.03% 17,856,614 $58,391,128
SPY SPY $169,143,405 42.97% 226,500 $21,841,395

Top movers (QoQ)

Security Action Shares Δ Value Δ
MAX Price move only +0 +$58.4M
SPY Price move only +0 +$21.8M

Exited positions

Includes corporate events (mergers, delistings) — not all exits are sells

Closed positions reflect 13F reporting changes; for index managers these are often mechanical (delisting, M&A, index rebalancing), not active decisions.

SecurityQuarter Shares before Value before Price since exit
SPY June 30, 2025 216,197 $120,938,440 No longer tracked