George Manning Rountree serves as Executive at WHITE MOUNTAINS INSURANCE GROUP LTD, where they oversee executive responsibilities. Since joining the company, George Manning Rountree has executed 54 insider transactions totaling $13.9M, demonstrating a bearish approach to their equity position. Their most recent transaction on Dec 19, 2025 involved selling 5,000 shares valued at $10.3M.
George Manning Rountree currently holds 13,809 shares of WHITE MOUNTAINS INSURANCE GROUP LTD (WTM), valued at approximately $0. This represents their equity stake as Executive.
Based on SEC Form 4 filings, George Manning Rountree has been a net seller of WTM stock. They have purchased $0 and sold $13.9M worth of shares.
George Manning Rountree's most recent insider trade was on Dec 19, 2025, when they sold 5,000 shares at $2050.00 per share.
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| $N/A |
| Discretionary |
| Jan 1, 2024 | WTM | $1.6M | Payment | 1,068 | $1505.01 | Discretionary |
| Feb 22, 2023 | WTM | $0 | Award | 2,000 | $N/A | Discretionary |
| Jan 1, 2023 | WTM | $1.5M | Payment | 1,068 | $1414.33 | Discretionary |
| Feb 25, 2022 | WTM | $0 | Award | 2,700 | $N/A | Discretionary |
| Jan 1, 2022 | WTM | $1.2M | Payment | 1,187 | $1013.90 | Discretionary |
| Feb 25, 2021 | WTM | $0 | Award | 2,700 | $N/A | Discretionary |
| Jan 1, 2021 | WTM | $1.2M | Payment | 1,187 | $1000.66 | Discretionary |
| Feb 27, 2020 | WTM | $0 | Award | 2,700 | $N/A | Discretionary |
| Jan 1, 2020 | WTM | $1.3M | Payment | 1,186 | $1115.51 | Discretionary |
| Feb 28, 2019 | WTM | $0 | Award | 3,000 | $N/A | Discretionary |
| Jan 1, 2019 | WTM | $1.0M | Payment | 1,188 | $857.69 | Discretionary |
| Mar 1, 2018 | WTM | $0 | Award | 3,000 | $N/A | Discretionary |
| Mar 1, 2018 | WTM | $0 | Award | 100 | $N/A | Discretionary |
| Mar 1, 2018 | WTM | $0 | Award | 100 | $N/A | Discretionary |
| Jan 1, 2018 | WTM | $1.0M | Payment | 1,187 | $851.28 | Discretionary |
| Mar 1, 2017 | WTM | $0 | Award | 2,900 | $N/A | Discretionary |
| Jan 1, 2017 | WTM | $794.2K | Payment | 950 | $836.05 | Discretionary |
| Aug 25, 2016 | WTM | $0 | Award | 2,900 | $N/A | Discretionary |
| Aug 25, 2016 | WTM | $0 | Award | 750 | $N/A | Discretionary |
| Jan 1, 2016 | WTM | $691.9K | Payment | 952 | $726.81 | Discretionary |
| Sep 9, 2015 | WTM | $104.3K | Sale | 139 | $750.00 | Discretionary |
| Sep 9, 2015 | WTM | $75.0K | Sale | 100 | $750.00 | Discretionary |
| Sep 9, 2015 | WTM | $479.2K | Sale | 639 | $749.97 | Discretionary |
| Sep 9, 2015 | WTM | $75.0K | Sale | 100 | $750.04 | Discretionary |
| Sep 9, 2015 | WTM | $191.3K | Sale | 255 | $750.05 | Discretionary |
| Sep 9, 2015 | WTM | $75.2K | Sale | 100 | $751.61 | Discretionary |
| Sep 9, 2015 | WTM | $79.8K | Sale | 106 | $753.22 | Discretionary |
| Sep 9, 2015 | WTM | $75.3K | Sale | 100 | $753.24 | Discretionary |