Skip to content
Disclosery

WHITE MOUNTAINS INSURANCE GROUP LTD

Follow

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

Filings

Every filing of this filer: 13F reports and notices, the 13D and 13G it filed or is a reporting person of, and Forms 3, 4 and 5 it reported as an owner.

FilingSubjectFiledAcceptedIngested
13F-HR 0001104659-26-094905 Quarter ended 2026-06-302026-08-12acceptance time not in the bulk data set
13F-HR 0001104659-26-059351 Quarter ended 2026-03-312026-05-12acceptance time not in the bulk data set
13F-HR 0001104659-26-014432 Quarter ended 2025-12-312026-02-12acceptance time not in the bulk data set
13F-HR 0001104659-25-110906 Quarter ended 2025-09-302025-11-13acceptance time not in the bulk data set
13F-HR 0001104659-25-076169 Quarter ended 2025-06-302025-08-11acceptance time not in the bulk data set
13F-HR 0001104659-25-047309 Quarter ended 2025-03-312025-05-12acceptance time not in the bulk data set
13F-HR 0001104659-25-012202 Quarter ended 2024-12-312025-02-12acceptance time not in the bulk data set
13F-HR 0001104659-24-116806 Quarter ended 2024-09-302024-11-12acceptance time not in the bulk data set
13F-HR 0001104659-24-087260 Quarter ended 2024-06-302024-08-08acceptance time not in the bulk data set
13F-HR 0001104659-24-059389 Quarter ended 2024-03-312024-05-09acceptance time not in the bulk data set
13F-HR 0001104659-24-019920 Quarter ended 2023-12-312024-02-13acceptance time not in the bulk data set
13F-HR 0001104659-23-115989 Quarter ended 2023-09-302023-11-09acceptance time not in the bulk data set
13F-HR 0001104659-23-089581 Quarter ended 2023-06-302023-08-10acceptance time not in the bulk data set
13F-HR 0001104659-23-058759 Quarter ended 2023-03-312023-05-11acceptance time not in the bulk data set
13F-HR 0001104659-23-019698 Quarter ended 2022-12-312023-02-13acceptance time not in the bulk data set
13F-HR 0001104659-22-116476 Quarter ended 2022-09-302022-11-09acceptance time not in the bulk data set
13F-HR 0001104659-22-089729 Quarter ended 2022-06-302022-08-12acceptance time not in the bulk data set
13F-HR 0001104659-22-059416 Quarter ended 2022-03-312022-05-12acceptance time not in the bulk data set
13F-HR 0001104659-22-020471 Quarter ended 2021-12-312022-02-11acceptance time not in the bulk data set
13F-HR 0001104659-21-137569 Quarter ended 2021-09-302021-11-12acceptance time not in the bulk data set
13F-HR 0001104659-21-104158 Quarter ended 2021-06-302021-08-12acceptance time not in the bulk data set
13F-HR 0001104659-21-066440 Quarter ended 2021-03-312021-05-14acceptance time not in the bulk data set
13F-HR 0001104659-21-021926 Quarter ended 2020-12-312021-02-12acceptance time not in the bulk data set
13F-NT 0001104659-20-124453 Quarter ended 2020-09-302020-11-12acceptance time not in the bulk data set
13F-NT 0001104659-20-093877 Quarter ended 2020-06-302020-08-12acceptance time not in the bulk data set
13F-NT 0001104659-20-060175 Quarter ended 2020-03-312020-05-12acceptance time not in the bulk data set
13F-NT 0001104659-20-019221 Quarter ended 2019-12-312020-02-12acceptance time not in the bulk data set
13F-NT 0001104659-19-062639 Quarter ended 2019-09-302019-11-12acceptance time not in the bulk data set
13F-NT 0001104659-19-044941 Quarter ended 2019-06-302019-08-08acceptance time not in the bulk data set
13F-NT 0001104659-19-028913 Quarter ended 2019-03-312019-05-13acceptance time not in the bulk data set
13F-NT 0001104659-19-007913 Quarter ended 2018-12-312019-02-13acceptance time not in the bulk data set
13F-NT 0001104659-18-066654 Quarter ended 2018-09-302018-11-07acceptance time not in the bulk data set
13F-NT 0001104659-18-050501 Quarter ended 2018-06-302018-08-08acceptance time not in the bulk data set
13F-NT 0001104659-18-032199 Quarter ended 2018-03-312018-05-10acceptance time not in the bulk data set
13F-NT 0001104659-18-009013 Quarter ended 2017-12-312018-02-13acceptance time not in the bulk data set
13F-NT 0001104659-17-067379 Quarter ended 2017-09-302017-11-09acceptance time not in the bulk data set
13F-NT 0001104659-17-051055 Quarter ended 2017-06-302017-08-10acceptance time not in the bulk data set
13F-NT 0001104659-17-031918 Quarter ended 2017-03-312017-05-11acceptance time not in the bulk data set
13F-NT 0001104659-17-008629 Quarter ended 2016-12-312017-02-13acceptance time not in the bulk data set
13F-NT 0001104659-16-156210 Quarter ended 2016-09-302016-11-10acceptance time not in the bulk data set
13F-NT 0001104659-16-138855 Quarter ended 2016-06-302016-08-11acceptance time not in the bulk data set
13F-NT 0001104659-16-120482 Quarter ended 2016-03-312016-05-12acceptance time not in the bulk data set
13F-HR 0001104659-16-097037 Quarter ended 2015-12-312016-02-16acceptance time not in the bulk data set
13F-HR 0001104659-15-078365 Quarter ended 2015-09-302015-11-12acceptance time not in the bulk data set
13F-HR 0001104659-15-058884 Quarter ended 2015-06-302015-08-12acceptance time not in the bulk data set
13F-HR 0001104659-15-037914 Quarter ended 2015-03-312015-05-14acceptance time not in the bulk data set
13F-HR 0001104659-15-010870 Quarter ended 2014-12-312015-02-17acceptance time not in the bulk data set
13F-HR 0001104659-14-080391 Quarter ended 2014-09-302014-11-13acceptance time not in the bulk data set
13F-HR 0001104659-14-058557 Quarter ended 2014-06-302014-08-08acceptance time not in the bulk data set
13F-HR 0001104659-14-037631 Quarter ended 2014-03-312014-05-12acceptance time not in the bulk data set
13F-HR 0001104659-14-009764 Quarter ended 2013-12-312014-02-13acceptance time not in the bulk data set
13F-HR 0001104659-13-084235 Quarter ended 2013-09-302013-11-13acceptance time not in the bulk data set
13F-HR 0001104659-13-061992 Quarter ended 2013-06-302013-08-09acceptance time not in the bulk data set