Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| WHITE MOUNTAINS INSURANCE GROUP LTDWTM · Entity 3904 | MD & Chief Accounting Officer | February 25, 2026 | February 27, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
WHITE MOUNTAINS INSURANCE GROUP LTD
Report date February 25, 2026 · Filed February 27, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common Shares (Restricted)SEC Table I · non-derivative | Direct | 1,825 |
Reported balance
After 2026-02-25 transaction · row 1
Account or security details depend on footnotes; rows are not merged.
1 source rowRow 1 · 2026-02-25 · Grant · Acquired 600 · Balance 1,825 F1: On February 25, 2026, the Reporting Person received a restricted share award of 600 Common Shares, which vests on January 1, 2029. |
| Common SharesSEC Table I · non-derivative | Direct | 2,491 |
Reported balance
Holding disclosure · report date 2026-02-25 · row 2
Holding and transaction disclosures are not merged.
1 source rowRow 2 · Balance 2,491 |
| Common SharesSEC Table I · non-derivative | Indirectby 401(k) | 20 |
Reported balance
Holding disclosure · report date 2026-02-25 · row 3
Holding and transaction disclosures are not merged.
1 source rowRow 3 · Balance 20 |
Filing footnotes · ownership attribution and instrument terms
F1: On February 25, 2026, the Reporting Person received a restricted share award of 600 Common Shares, which vests on January 1, 2029.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| February 25, 2026 Filed Feb 27, 2026 16:18 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 600 | $0.00 | $0.00 |
DisclosureSEC source: 0000776867-26-000019 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,825 F1 · balance_after: On February 25, 2026, the Reporting Person received a restricted share award of 600 Common Shares, which vests on January 1, 2029. Read SEC document |
| January 01, 2026 Filed Jan 5, 2026 14:09 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 274 | $2,078.03 | $569,380.22 |
DisclosureSEC source: 0000776867-26-000010 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 2,491 F1 · balance_after: On January 1, 2026, 600 restricted Common Shares became unrestricted. 274 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| December 23, 2025 Filed Dec 23, 2025 18:55 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 60 | $0.00 | $0.00 |
DisclosureSEC source: 0000776867-25-000034 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 2,165 Read SEC document |
| February 26, 2025 Filed Feb 28, 2025 14:23 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 625 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-25-003859 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,825 F1 · shares: On February 26, 2025, the Reporting Person received a restricted share award of 625 Common Shares, which vests on January 1, 2028. Read SEC document |
| January 01, 2025 Filed Jan 3, 2025 14:21 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 323 | $1,945.06 | $628,254.38 |
DisclosureSEC source: 0001062993-25-000037 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 2,225 F1 · balance_after: On January 1, 2025, 750 restricted Common Shares became unrestricted. 323 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| November 29, 2024 Filed Dec 2, 2024 21:05 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 75 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-24-019864 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,798 Read SEC document |
| February 22, 2024 Filed Feb 24, 2024 02:27 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 600 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-24-004344 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,950 F1 · shares: On February 22, 2024, the Reporting Person received a restricted share award of 600 Common Shares, which vests on January 1, 2027. Read SEC document |
| January 01, 2024 Filed Jan 2, 2024 16:59 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 261 | $1,505.01 | $392,807.61 |
DisclosureSEC source: 0001062993-24-000014 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,873 F1 · balance_after: On January 1, 2024, 600 restricted Common Shares became unrestricted. 261 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| December 01, 2023 Filed Dec 1, 2023 22:10 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 100 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-23-021704 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 1,534 Read SEC document |
| February 22, 2023 Filed Feb 24, 2023 14:00 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 600 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-23-004718 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,950 F1 · shares: On February 22, 2023, the Reporting Person received a restricted share award of 600 Common Shares, which vests on January 1, 2026. Read SEC document |
| January 01, 2023 Filed Jan 3, 2023 19:11 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 176 | $1,414.33 | $248,922.08 |
DisclosureSEC source: 0001062993-23-000033 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,634 F1 · balance_after: On January 1, 2023, 400 restricted Common Shares became unrestricted. 176 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| December 28, 2022 Filed Dec 29, 2022 14:25 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 53 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-22-024524 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,410 Read SEC document |
| December 22, 2022 Filed Dec 27, 2022 19:48 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | SaleCommon Shares | 100 | $1,371.84 | $137,184.00 |
DisclosureSEC source: 0001062993-22-024489 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,463 Read SEC document |
| May 31, 2022 Filed Jun 1, 2022 13:22 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | SaleCommon Shares | 100 | $1,270.94 | $127,094.00 |
DisclosureSEC source: 0001062993-22-013906 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,563 Read SEC document |
| February 25, 2022 Filed Feb 28, 2022 18:13 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 750 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-22-005859 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · MD & Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,750 F1 · shares: On February 25, 2022, the Reporting Person received a restricted share award of 750 Common Shares, which vests on January 1, 2025. Read SEC document |
| January 01, 2022 Filed Jan 5, 2022 01:58 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 178 | $1,013.90 | $180,474.20 |
DisclosureSEC source: 0001062993-22-000449 · form4.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,663 F1 · balance_after: On January 1, 2022, 400 restricted Common Shares became unrestricted. 178 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| June 18, 2021 Filed Jun 21, 2021 20:00 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 65 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-21-000026 · edgar.xml · nonDerivative · entry 1 Hildreth Michaela · CIK 0001863001 · Chief Accounting Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 1,441 Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.