Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| WHITE MOUNTAINS INSURANCE GROUP LTDWTM · Entity 3904 | Director | May 21, 2026 | May 22, 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 May 21, 2026 · Filed May 22, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common SharesSEC Table I · non-derivative | Direct | 10,575 |
Reported balance
After 2026-05-21 transaction · row 1
1 source rowRow 1 · 2026-05-21 · Grant · Acquired 135 · Balance 10,575 F1: Annual Director Share Award |
| Common SharesSEC Table I · non-derivative | Indirectby 401(k) | 119 |
Reported balance
Holding disclosure · report date 2026-05-21 · row 2
Holding and transaction disclosures are not merged.
1 source rowRow 2 · Balance 119 |
Filing footnotes · ownership attribution and instrument terms
F1: Annual Director Share Award
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 |
|---|---|---|---|---|---|---|
| May 21, 2026 Filed May 22, 2026 14:30 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares | 135 | $0.00 | $0.00 |
DisclosureSEC source: 0000776867-26-000036 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 10,575 F1 · shares: Annual Director Share Award Read SEC document |
| December 19, 2025 Filed Dec 22, 2025 21:51 UTC Amendment | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | SaleCommon Shares | 5,000 | $2,050.00 | $10,250,000.00 |
DisclosureSEC source: 0000776867-25-000032 · form4a.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 10,440 Read SEC document |
| December 19, 2025 Filed Dec 22, 2025 15:14 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | SaleCommon Shares | 5,000 | $0.00 | $0.00 |
DisclosureSEC source: 0000776867-25-000030 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 10,440 Read SEC document |
| November 25, 2025 Filed Nov 26, 2025 15:25 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 50 | $0.00 | $0.00 |
DisclosureSEC source: 0000776867-25-000021 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 15,440 Read SEC document |
| May 22, 2025 Filed May 23, 2025 23:08 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares | 150 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-25-010295 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 15,490 F1 · shares: Annual Director Share Award Read SEC document |
| May 23, 2024 Filed May 24, 2024 16:13 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares | 165 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-24-011185 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 15,340 F1 · shares: Annual Director Share Award Read SEC document |
| March 21, 2024 Filed Mar 21, 2024 15:36 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 55 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-24-006912 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 15,175 Read SEC document |
| February 22, 2024 Filed Feb 24, 2024 02:26 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares | 45 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-24-004343 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Director 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 15,230 F1 · balance_after: Pro-rated director share award. Read SEC document |
| January 01, 2024 Filed Jan 2, 2024 17:00 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 710 | $1,505.01 | $1,068,557.10 |
DisclosureSEC source: 0001062993-24-000016 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · President 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 15,185 F1 · balance_after: On January 1, 2024, 1,800 restricted Common Shares became unrestricted. 710 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| January 01, 2023 Filed Jan 3, 2023 19:13 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 710 | $1,414.33 | $1,004,174.30 |
DisclosureSEC source: 0001062993-23-000035 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · President 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 14,095 F1 · balance_after: On January 1, 2023, 1,800 restricted Common Shares became unrestricted. 710 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| June 01, 2022 Filed Jun 2, 2022 15:06 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 100 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-22-014082 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · President 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 13,005 Read SEC document |
| January 01, 2022 Filed Jan 5, 2022 01:59 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 800 | $1,013.90 | $811,120.00 |
DisclosureSEC source: 0001062993-22-000450 · form4.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 13,105 F1 · balance_after: On January 1, 2022, 2,000 restricted Common Shares became unrestricted. 800 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| February 25, 2021 Filed Feb 27, 2021 01:28 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 1,800 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-21-000007 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,600 F1 · shares: On February 25, 2021, the Reporting Person received a restricted share award of 1,800 Common Shares, which vests on January 1, 2024. Read SEC document |
| January 01, 2021 Filed Jan 4, 2021 21:02 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 930 | $1,000.66 | $930,613.80 |
DisclosureSEC source: 0001668244-21-000003 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 11,905 F1 · balance_after: On January 1, 2021, 2,000 restricted Common Shares became unrestricted. 930 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| December 08, 2020 Filed Dec 11, 2020 02:51 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 30 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-20-000018 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 10,835 Read SEC document |
| February 27, 2020 Filed Mar 2, 2020 21:22 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 1,800 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-20-000008 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,800 F1 · shares: On February 27, 2020, the Reporting Person received a restricted share award of 1,800 Common Shares, which vests on January 1, 2023. Read SEC document |
| January 01, 2020 Filed Jan 2, 2020 22:41 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,045 | $1,115.51 | $1,165,707.95 |
DisclosureSEC source: 0001668244-20-000002 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 10,865 F1 · balance_after: On January 1, 2020, 2,250 restricted Common Shares became unrestricted. 1,045 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| September 25, 2019 Filed Sep 26, 2019 20:30 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 90 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-19-000042 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 9,660 Read SEC document |
| February 28, 2019 Filed Mar 4, 2019 15:52 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 2,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-19-000010 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,250 F1 · shares: On February 28, 2019, the Reporting Person received a restricted share award of 2,000 Common Shares, which vests on January 1, 2022. Read SEC document |
| January 01, 2019 Filed Jan 2, 2019 20:56 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,050 | $857.69 | $900,574.50 |
DisclosureSEC source: 0001668244-19-000003 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 9,750 F1 · balance_after: On January 1, 2019, 2,250 restricted Common Shares became unrestricted. 1,050 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| March 29, 2018 Filed Mar 30, 2018 21:52 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 50 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-18-000013 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,550 Read SEC document |
| March 01, 2018 Filed Mar 5, 2018 21:23 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 2,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-18-000007 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,500 F1 · shares: On March 1, 2018, the Reporting Person received a restricted share award of 2,000 Common Shares, which vests on January 1, 2021. Read SEC document |
| January 01, 2018 Filed Jan 4, 2018 01:08 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,275 | $851.28 | $1,085,382.00 |
DisclosureSEC source: 0001668244-18-000003 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · EVP & Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,600 F1 · balance_after: On January 1, 2018, 2,750 restricted Common Shares became unrestricted. 1,275 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| December 26, 2017 Filed Dec 27, 2017 22:53 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GiftCommon Shares | 100 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-17-000040 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,125 Read SEC document |
| May 25, 2017 Filed May 26, 2017 20:32 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 750 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-17-000026 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Chief Financial Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,250 F1 · shares: On May 25, 2017, the Reporting Person received a restricted share award of 750 Common Shares, 250 of which vest on January 1, 2018, 250 of which vest on January 1, 2019 and 250 of which vest on January 1, 2020. Read SEC document |
| March 01, 2017 Filed Mar 3, 2017 21:20 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (Restricted) | 2,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-17-000013 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Managing Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,500 F1 · shares: On March 1, 2017, the Reporting Person received a restricted share award of 2,000 Common Shares, which vests on January 1, 2020. Read SEC document |
| January 01, 2017 Filed Jan 4, 2017 21:05 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,100 | $836.05 | $919,655.00 |
DisclosureSEC source: 0001668244-17-000002 · edgar.xml · nonDerivative · entry 1 CAMPBELL REID TARLTON · CIK 0001378156 · Managing Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,225 F1 · balance_after: On January 1, 2017, 2,250 restricted WTM Common Shares became unrestricted. 1,100 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. 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.