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SC 13D

Beneficial Ownership Report

WHITE MOUNTAINS INSURANCE GROUP LTD Filed Acc 0000950130-95-001826

Stakes reported in this filing

Stake history · largest stake in each 13D and 13G

  1. 2026-11-13 SCHEDULE 13D/A · White Mountains Insurance Group, Ltd. 22.6%
  2. 2026-11-05 SCHEDULE 13D/A · White Mountains Insurance Group, Ltd. 24.3%
  3. 2026-10-30 SCHEDULE 13D/A · White Mountains Insurance Group, Ltd. 35.1%
  4. 2026-05-01 SCHEDULE 13D/A · White Mountains Insurance Group, Ltd. 33.03%
  5. 2025-08-08 SCHEDULE 13D/A · White Mountains Insurance Group, Ltd. 31.7%
  6. 2024-05-09 SC 13D/A · WHITE MOUNTAINS INSURANCE GROUP, LTD. 32.9%
  7. 2024-05-03 SC 13D/A · WHITE MOUNTAINS INSURANCE GROUP, LTD. 44.3%
  8. 2024-01-03 SC 13D/A · WHITE MOUNTAINS INSURANCE GROUP, LTD. 48.3%
  9. 2023-11-02 SC 13D/A · WHITE MOUNTAINS INSURANCE GROUP, LTD. 48.7%
  10. 2023-06-30 SC 13D · WHITE MOUNTAINS INSURANCE GROUP, LTD. 49.9%
  11. 2023-02-10 SC 13G · WHITE MOUNTAINS INSURANCE GROUP, LTD. (No. 39.3%
  12. 2022-02-14 SC 13G/A · WHITE MOUNTAINS INSURANCE GROUP, LTD. (No. 43.0%
  13. 2021-02-12 SC 13G · WHITE MOUNTAINS INSURANCE GROUP, LTD. (No. 61.9%
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