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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 $285,933,553 across 2 holdings for the quarter ended 2025-03-31, in a 13F-HR filed 2025-05-12.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001104659-25-047309

Period
2025-03-31
Reported value
$286M
Holdings
2
Top 10 weight
100%
New
0
Sold out
0

Largest buys vs the previous quarter

None.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
SPYreduced-166,949-$93.4M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2025

Share positions as resolved from 13F-HR 0001104659-25-047309, largest first. % of portfolio is the value over $285,933,553, 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; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 17,856,614 shares; 2024Q4: 17,856,614 shares; 2025Q1: 17,856,614 shares 17,856,614$165M57.7%0Timeline
SPYSTATE STR SPDR S&P 500 ETF TQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 383,146 shares; 2024Q4: 383,146 shares; 2025Q1: 216,197 shares 216,197$121M42.3%-166,949Timeline

How Q1 2025 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 0001104659-25-047309 base2025-05-12acceptance time not in the bulk data set