person · Reporting owner
Rountree George Manning
Disclosed activity across 2 companies
Sign in to followReported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| OneBeacon Insurance Group, Ltd.OB · Entity 107326 | Director | March 06, 2017 | March 24, 2017 |
| WHITE MOUNTAINS INSURANCE GROUP LTDWTM · Entity 3904 | Director · Chief Executive Officer | December 19, 2025 | December 22, 2025 |
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.
OneBeacon Insurance Group, Ltd.
Report date March 06, 2017 · Filed March 24, 2017
This filing explicitly reported no securities owned.
WHITE MOUNTAINS INSURANCE GROUP LTD
Report date December 19, 2025 · Filed December 22, 2025
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common SharesSEC Table I · non-derivative | Direct | 13,809 |
Reported balance
After 2025-12-19 transaction · row 1
1 source rowRow 1 · 2025-12-19 · Sale · Disposed 5,000 · Balance 13,809 |
| Common Shares (restricted)SEC Table I · non-derivative | Direct | 5,425 |
Reported balance
Holding disclosure · report date 2025-12-19 · row 2
Holding and transaction disclosures are not merged.
1 source rowRow 2 · Balance 5,425 |
| Common SharesSEC Table I · non-derivative | Indirectby 401(k) | 122 |
Reported balance
Holding disclosure · report date 2025-12-19 · row 3
Holding and transaction disclosures are not merged.
1 source rowRow 3 · Balance 122 F1: Reflects accumulation of 2 Common Shares in Reporting Person's Company retirement account since his last filed report. The information in this report is based on a plan report dated as of December 20, 2025. |
Filing footnotes · ownership attribution and instrument terms
F1: Reflects accumulation of 2 Common Shares in Reporting Person's Company retirement account since his last filed report. The information in this report is based on a plan report dated as of December 20, 2025.
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 |
|---|---|---|---|---|---|---|
| December 19, 2025 Filed Dec 22, 2025 15:13 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | SaleCommon Shares | 5,000 | $2,050.00 | $10,250,000.00 |
DisclosureSEC source: 0000776867-25-000029 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 13,809 Read SEC document |
| February 26, 2025 Filed Feb 28, 2025 14:33 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 1,625 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-25-003866 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 5,425 F1 · shares: On February 26, 2025, the Reporting Person received a restricted share award of 1,625 Common Shares, which vests on January 1, 2028. Read SEC document |
| January 01, 2025 Filed Jan 3, 2025 14:23 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,067 | $1,945.06 | $2,075,379.02 |
DisclosureSEC source: 0001062993-25-000040 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 18,809 F1 · balance_after: On January 1, 2025, 2,700 restricted Common Shares became unrestricted. 1,067 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| February 22, 2024 Filed Feb 24, 2024 02:28 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 1,800 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-24-004347 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 6,500 F1 · shares: On February 22, 2024, the Reporting Person received a restricted share award of 1,800 Common Shares, which vests on January 1, 2027. Read SEC document |
| January 01, 2024 Filed Jan 2, 2024 17:01 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,068 | $1,505.01 | $1,607,350.68 |
DisclosureSEC source: 0001062993-24-000017 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: No plan indicated Ownership: Direct Disclosed balance after: 17,176 F1 · balance_after: On January 1, 2024, 2,700 restricted Common Shares became unrestricted. 1,068 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| February 22, 2023 Filed Feb 24, 2023 14:01 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 2,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-23-004721 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 7,400 F1 · shares: On February 22, 2023, the Reporting Person received a restricted share award of 2,000 Common Shares, which vests on January 1, 2026. Read SEC document |
| January 01, 2023 Filed Jan 3, 2023 19:14 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,068 | $1,414.33 | $1,510,504.44 |
DisclosureSEC source: 0001062993-23-000036 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 15,544 F1 · balance_after: On January 1, 2023, 2,700 restricted Common Shares became unrestricted. 1,068 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| February 25, 2022 Filed Feb 28, 2022 18:24 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 2,700 | $0.00 | $0.00 |
DisclosureSEC source: 0001062993-22-005865 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,100 F1 · shares: On February 25, 2022, the Reporting Person received a restricted share award of 2,700 Common Shares, which vests on January 1, 2025. Read SEC document |
| January 01, 2022 Filed Jan 5, 2022 01:59 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,187 | $1,013.90 | $1,203,499.30 |
DisclosureSEC source: 0001062993-22-000451 · form4.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 13,912 F1 · balance_after: On January 1, 2022, 3,000 restricted Common Shares became unrestricted. 1,187 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 01:29 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 2,700 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-21-000008 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,400 F1 · shares: On February 25, 2021, the Reporting Person received a restricted share award of 2,700 Common Shares, which vests on January 1, 2024. Read SEC document |
| January 01, 2021 Filed Jan 4, 2021 21:03 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,187 | $1,000.66 | $1,187,783.42 |
DisclosureSEC source: 0001668244-21-000004 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 12,099 F1 · balance_after: On January 1, 2021, 3,000 restricted Common Shares became unrestricted. 1,187 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| February 27, 2020 Filed Mar 2, 2020 21:23 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 2,700 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-20-000009 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,700 F1 · shares: On February 27, 2020, the Reporting Person received a restricted share award of 2,700 Common Shares, which vests on January 1, 2023. Read SEC document |
| January 01, 2020 Filed Jan 2, 2020 22:39 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,186 | $1,115.51 | $1,322,994.86 |
DisclosureSEC source: 0001668244-20-000001 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 10,286 F1 · balance_after: On January 1, 2020, 3,000 restricted Common Shares became unrestricted. 1,186 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| February 28, 2019 Filed Mar 4, 2019 15:55 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 3,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-19-000011 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 9,000 F1 · shares: On February 28, 2019, the Reporting Person received a restricted share award of 3,000 Common Shares, which vests on January 1, 2022. Read SEC document |
| January 01, 2019 Filed Jan 2, 2019 20:59 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,188 | $857.69 | $1,018,935.72 |
DisclosureSEC source: 0001668244-19-000004 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,472 F1 · balance_after: On January 1, 2019, 3,000 restricted Common Shares became unrestricted. 1,188 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| March 01, 2018 Filed Mar 5, 2018 21:33 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 3,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-18-000008 · edgar.xml · nonDerivative · entry 3 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 9,000 F3 · shares: On March 1, 2018, the Reporting Person received a restricted share award of 3,000 Common Shares, which vests on January 1, 2021. Read SEC document |
| March 01, 2018 Filed Mar 5, 2018 21:33 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 100 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-18-000008 · edgar.xml · nonDerivative · entry 2 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,000 F2 · shares: On March 1, 2018, the Reporting Person received a restricted share award of 100 Common Shares, which vests on January 1, 2020. Read SEC document |
| March 01, 2018 Filed Mar 5, 2018 21:33 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 100 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-18-000008 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 5,900 F1 · shares: On March 1, 2018, the Reporting Person received a restricted share award of 100 Common Shares, which vests on January 1, 2019. Read SEC document |
| January 01, 2018 Filed Jan 4, 2018 01:06 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 1,187 | $851.28 | $1,010,469.36 |
DisclosureSEC source: 0001668244-18-000002 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 6,660 F1 · balance_after: On January 1, 2018, 3000 restricted Common Shares became unrestricted. 1187 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Read SEC document |
| March 01, 2017 Filed Mar 3, 2017 21:19 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | GrantCommon Shares (restricted) | 2,900 | $0.00 | $0.00 |
DisclosureSEC source: 0001668244-17-000012 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Director · Chief Executive Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 8,800 F1 · shares: On March 1, 2017, the Reporting Person received a restricted share award of 2,900 Common Shares, which vests on January 1, 2020. Read SEC document |
| January 01, 2017 Filed Jan 4, 2017 21:04 UTC | WHITE MOUNTAINS INSURANCE GROUP LTD WTM · Entity 3904 | Tax withholdingCommon Shares | 950 | $836.05 | $794,247.50 |
DisclosureSEC source: 0001668244-17-000001 · edgar.xml · nonDerivative · entry 1 Rountree George Manning · CIK 0001457475 · Managing Director 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 4,847 F1 · balance_after: On January 1, 2017, 2,250 restricted WTM Common Shares became unrestricted. 950 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.