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Disclosery

WHITE MOUNTAINS INSURANCE GROUP LTD

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13F filer, CIK 776867, Hanover, NH

WHITE MOUNTAINS INSURANCE GROUP LTD reported $393,601,043 across 2 holdings for the quarter ended 2026-06-30, in a 13F-HR filed 2026-08-12.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001104659-26-094905

Period
2026-06-30
Reported value
$394M
Holdings
2
Top 10 weight
100%
New
0
Sold out
0

Holdings, Q2 2026

Share positions as resolved from 13F-HR 0001104659-26-094905, largest first. % of portfolio is the value over $393,601,043, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
MAXMEDIAALPHA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: 17,856,614 shares; 2024Q4: 17,856,614 shares; 2025Q1: 17,856,614 shares; 2025Q2: 17,856,614 shares; 2025Q3: 17,856,614 shares; 2025Q4: 17,856,614 shares; 2026Q1: 17,856,614 shares; 2026Q2: 17,856,614 shares 17,856,614$224M57.03%0Timeline
SPYSTATE STR SPDR S&P 500 ETF TQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2024Q3: 383,146 shares; 2024Q4: 383,146 shares; 2025Q1: 216,197 shares; 2025Q2: not reported; 2025Q3: not reported; 2025Q4: 45,000 shares; 2026Q1: 226,500 shares; 2026Q2: 226,500 shares 226,500$169M42.97%0Timeline

How Q2 2026 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001104659-26-094905 base2026-08-12acceptance time not in the bulk data set