WTM WHITE MOUNTAINS INSURANCE GROUP LTD
NYSE · SEC CIK 776867 · EDGAR
- Bought, last 12 months
- $0 0 purchases by 0 insiders
- Sold, last 12 months
- $20.84M 4 sales by 3 insiders
- Filings on record
- 111 since 2021-10-12, latest 2026-08-31 17:04
BoughtSold
Most active insiders, 12 months
| Insider | Title | Bought | Sold |
|---|---|---|---|
| Rountree George Manning | CEO, Dir | — | $10.25M |
| CAMPBELL REID TARLTON | Dir | — | $10.25M |
| Gelston Philip A | Dir | — | $338.0K |
| Chu John | Dir | — | — |
| Papamichael Michael A | CFO | — | — |
| Harrison Giles E | Pres | — | — |
| Caffrey Liam P | CEO, Dir | — | — |
| Hildreth Michaela | CAO, MD | — | — |
| Dillon Margaret | Dir | — | — |
| SHANK SUZANNE F. | Dir | — | — |
Transactions 111
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026-08-31 17:04 | 2026-08-31 | WTM | Tanner David Allen | Dir | G - Gift | $0.00 | -2 | 2,012 | -0.1% | $0 | |
| 2026-08-27 15:46 | 2026-08-26 | WTM | Klar Stephen | Dir | A - Grant | $0.00 | +113 | 113 | New | $0 | |
| 2026-05-22 10:35 | 2026-05-21 | WTM | Tanner David Allen | Dir | A - Grant | $0.00 | +135 | 2,014 | +7% | $0 | |
| 2026-05-22 10:35 | 2026-05-21 | WTM | SHANK SUZANNE F. | Dir | A - Grant | $0.00 | +135 | 1,006 | +15% | $0 | |
| 2026-05-22 10:34 | 2026-05-21 | WTM | Hicks Weston M | Dir | A - Grant | $0.00 | +190 | 2,936 | +7% | $0 | |
| 2026-05-22 10:34 | 2026-05-21 | WTM | Gelston Philip A | Dir | A - Grant | $0.00 | +135 | 1,703 | +9% | $0 | |
| 2026-05-22 10:33 | 2026-05-21 | WTM | Dillon Margaret | Dir | A - Grant | $0.00 | +135 | 1,080 | +14% | $0 | |
| 2026-05-22 10:32 | 2026-05-21 | WTM | Chu John | Dir | A - Grant | $0.00 | +135 | 335 | +68% | $0 | |
| 2026-05-22 10:32 | 2026-05-21 | WTM | CHOKSI MARY C | Dir | A - Grant | $0.00 | +135 | 1,993 | +7% | $0 | |
| 2026-05-22 10:31 | 2026-05-21 | WTM | Carlson Peter M | Dir | A - Grant | $0.00 | +135 | 852 | +19% | $0 | |
| 2026-05-22 10:30 | 2026-05-21 | WTM | CAMPBELL REID TARLTON | Dir | A - Grant | $0.00 | +135 | 10.6K | +1% | $0 | |
| 2026-03-20 | 2026-03-19 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | G - Gift | $0.00 | -50 | 17.9K | -0.3% | $0 | |
| 2026-03-05 | 2026-03-04 | WTM | Tanner David Allen | Dir | G - Gift | $0.00 | -225 | 1,879 | -11% | $0 | |
| 2026-02-27 | 2026-02-25 | WTM | Caffrey Liam P | CEO, Dir | A - Grant | $0.00 | +1,500 | 3,650 | +70% | $0 | |
| 2026-02-27 | 2026-02-25 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | A - Grant | $0.00 | +775 | 2,500 | +45% | $0 | |
| 2026-02-27 | 2026-02-25 | WTM | Papamichael Michael A | CFO | A - Grant | $0.00 | +500 | 1,200 | +71% | $0 | |
| 2026-02-27 | 2026-02-25 | WTM | Hildreth Michaela | CAO, MD | A - Grant | $0.00 | +600 | 1,825 | +49% | $0 | |
| 2026-02-27 | 2026-02-25 | WTM | Harrison Giles E | Pres | A - Grant | $0.00 | +775 | 2,675 | +41% | $0 | |
| 2026-01-05 | 2026-01-01 | WTM | Hildreth Michaela | CAO, MD | F - Tax | $2,078.03 | -274 | 2,491 | -10% | -$569.4K | |
| 2026-01-02 | 2026-01-01 | WTM | Papamichael Michael A | CFO | F - Tax | $2,078.03 | -131 | 772 | -15% | -$272.2K | |
| 2026-01-02 | 2026-01-01 | WTM | Caffrey Liam P | CEO | F - Tax | $2,078.03 | -425 | 1,655 | -20% | -$883.2K | |
| 2026-01-02 | 2026-01-01 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | F - Tax | $2,078.03 | -398 | 17.9K | -2% | -$827.1K | |
| 2025-12-23 | 2025-12-23 | WTM | Hildreth Michaela | CAO, MD | G - Gift | $0.00 | -60 | 2,165 | -3% | $0 | |
| 2025-12-22 | 2025-12-19 | WTM | Rountree George Manning | CEO, Dir | S - Sale | $2,050.00 | -5,000 | 13.8K | -27% | -$10.25M | |
| 2025-12-22 | 2025-12-19 | WTM | CAMPBELL REID TARLTON | Dir | S - Sale | $0.00 | -5,000 | 10.4K | -32% | $0 | |
| A | 2025-12-22 | 2025-12-19 | WTM | CAMPBELL REID TARLTON | Dir | S - Sale | $2,050.00 | -5,000 | 10.4K | -32% | -$10.25M |
| 2025-12-16 | 2025-12-16 | WTM | Gelston Philip A | Dir | S - Sale | $2,048.51 | -165 | 1,568 | -10% | -$338.0K | |
| 2025-11-26 | 2025-11-25 | WTM | CAMPBELL REID TARLTON | Dir | G - Gift | $0.00 | -50 | 15.4K | -0.3% | $0 | |
| 2025-11-10 | 2025-11-10 | WTM | Tanner David Allen | Dir | G - Gift | $0.00 | -4 | 2,104 | -0.2% | $0 | |
| 2025-05-27 | 2025-05-22 | WTM | SHANK SUZANNE F. | Dir | A - Grant | $0.00 | +150 | 871 | +21% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | CAMPBELL REID TARLTON | Dir | A - Grant | $0.00 | +150 | 15.5K | +1.0% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | Carlson Peter M | Dir | A - Grant | $0.00 | +150 | 717 | +26% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | Dillon Margaret | Dir | A - Grant | $0.00 | +150 | 945 | +19% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | Tanner David Allen | Dir | A - Grant | $0.00 | +150 | 2,108 | +8% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | Yi Steven | Dir | A - Grant | $0.00 | +150 | 525 | +40% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | Hicks Weston M | Dir | A - Grant | $0.00 | +210 | 2,746 | +8% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | Gelston Philip A | Dir | A - Grant | $0.00 | +150 | 1,733 | +9% | $0 | |
| 2025-05-23 | 2025-05-22 | WTM | CHOKSI MARY C | Dir | A - Grant | $0.00 | +150 | 1,858 | +9% | $0 | |
| 2025-02-28 | 2025-02-26 | WTM | Caffrey Liam P | EVP, CFO | A - Grant | $0.00 | +1,025 | 3,400 | +43% | $0 | |
| 2025-02-28 | 2025-02-26 | WTM | Harrison Giles E | EVP, Chief Strategy Off | A - Grant | $0.00 | +900 | 1,900 | +90% | $0 | |
| 2025-02-28 | 2025-02-26 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | A - Grant | $0.00 | +825 | 2,725 | +43% | $0 | |
| 2025-02-28 | 2025-02-26 | WTM | Rountree George Manning | CEO, Dir | A - Grant | $0.00 | +1,625 | 5,425 | +43% | $0 | |
| 2025-02-28 | 2025-02-26 | WTM | Hildreth Michaela | CAO, MD | A - Grant | $0.00 | +625 | 1,825 | +52% | $0 | |
| 2025-01-03 | 2025-01-01 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | F - Tax | $1,945.06 | -496 | 17.3K | -3% | -$964.7K | |
| 2025-01-03 | 2025-01-01 | WTM | Caffrey Liam P | Pres, CFO | F - Tax | $1,945.06 | -420 | 830 | -34% | -$816.9K | |
| 2025-01-03 | 2025-01-01 | WTM | Hildreth Michaela | CAO, MD | F - Tax | $1,945.06 | -323 | 2,225 | -13% | -$628.3K | |
| 2025-01-03 | 2025-01-01 | WTM | Rountree George Manning | CEO, Dir | F - Tax | $1,945.06 | -1,067 | 18.8K | -5% | -$2.08M | |
| 2024-12-02 | 2024-11-29 | WTM | Hildreth Michaela | CAO, MD | G - Gift | $0.00 | -75 | 1,798 | -4% | $0 | |
| 2024-06-10 | 2024-06-10 | WTM | Harrison Giles E | EVP, Chief Strategy Off | A - Grant | $0.00 | +1,000 | 1,000 | New | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | CAMPBELL REID TARLTON | Dir | A - Grant | $0.00 | +165 | 15.3K | +1% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | Hicks Weston M | Dir | A - Grant | $0.00 | +230 | 2,536 | +10% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | Gelston Philip A | Dir | A - Grant | $0.00 | +165 | 1,583 | +12% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | Dillon Margaret | Dir | A - Grant | $0.00 | +165 | 795 | +26% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | Yi Steven | Dir | A - Grant | $0.00 | +165 | 375 | +79% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | SHANK SUZANNE F. | Dir | A - Grant | $0.00 | +165 | 721 | +30% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | Carlson Peter M | Dir | A - Grant | $0.00 | +165 | 1,133 | +17% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | Tanner David Allen | Dir | A - Grant | $0.00 | +165 | 1,958 | +9% | $0 | |
| 2024-05-24 | 2024-05-23 | WTM | CHOKSI MARY C | Dir | A - Grant | $0.00 | +165 | 1,708 | +11% | $0 | |
| 2024-03-21 | 2024-03-21 | WTM | CAMPBELL REID TARLTON | Dir | G - Gift | $0.00 | -55 | 15.2K | -0.4% | $0 | |
| 2024-02-23 | 2024-02-22 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | A - Grant | $0.00 | +900 | 3,150 | +40% | $0 | |
| 2024-02-23 | 2024-02-22 | WTM | CAMPBELL REID TARLTON | Dir | A - Grant | $0.00 | +45 | 15.2K | +0.3% | $0 | |
| 2024-02-23 | 2024-02-22 | WTM | Rountree George Manning | CEO, Dir | A - Grant | $0.00 | +1,800 | 6,500 | +38% | $0 | |
| 2024-02-23 | 2024-02-22 | WTM | Caffrey Liam P | EVP, CFO | A - Grant | $0.00 | +1,125 | 3,625 | +45% | $0 | |
| 2024-02-23 | 2024-02-22 | WTM | Hildreth Michaela | CAO, MD | A - Grant | $0.00 | +600 | 1,950 | +44% | $0 | |
| 2024-01-02 | 2024-01-01 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | F - Tax | $1,505.01 | -399 | 16.6K | -2% | -$600.5K | |
| 2024-01-02 | 2024-01-01 | WTM | Rountree George Manning | CEO, Dir | F - Tax | $1,505.01 | -1,068 | 17.2K | -6% | -$1.61M | |
| 2024-01-02 | 2024-01-01 | WTM | Hildreth Michaela | CAO, MD | F - Tax | $1,505.01 | -261 | 1,873 | -12% | -$392.8K | |
| 2024-01-02 | 2024-01-01 | WTM | CAMPBELL REID TARLTON | Pres | F - Tax | $1,505.01 | -710 | 15.2K | -4% | -$1.07M | |
| 2023-12-01 | 2023-12-01 | WTM | Hildreth Michaela | CAO, MD | G - Gift | $0.00 | -100 | 1,534 | -6% | $0 | |
| MA | 2023-11-20 | 2023-11-17 | WTM | Hicks Weston M | Dir | P - Purchase | $1,480.56 | +1,000 | 2,057 | +95% | +$1.48M |
| M | 2023-11-20 | 2023-11-17 | WTM | Hicks Weston M | Dir | P - Purchase | $1,480.56 | +1,000 | 1,358 | +279% | +$1.48M |
| 2023-05-30 | 2023-05-25 | WTM | Carlson Peter M | Dir | A - Grant | $0.00 | +180 | 968 | +23% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | Tanner David Allen | Dir | A - Grant | $0.00 | +180 | 1,793 | +11% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | Yi Steven | Dir | A - Grant | $0.00 | +180 | 210 | +600% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | SHANK SUZANNE F. | Dir | A - Grant | $0.00 | +180 | 556 | +48% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | Gelston Philip A | Dir | A - Grant | $0.00 | +180 | 1,418 | +15% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | Hicks Weston M | Dir | A - Grant | $0.00 | +250 | 1,306 | +24% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | CHOKSI MARY C | Dir | A - Grant | $0.00 | +180 | 1,543 | +13% | $0 | |
| 2023-05-26 | 2023-05-25 | WTM | Dillon Margaret | Dir | A - Grant | $0.00 | +180 | 630 | +40% | $0 | |
| 2023-02-24 | 2023-02-22 | WTM | Caffrey Liam P | EVP, CFO | A - Grant | $0.00 | +1,250 | 2,500 | +100% | $0 | |
| 2023-02-24 | 2023-02-22 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | A - Grant | $0.00 | +1,000 | 3,250 | +44% | $0 | |
| 2023-02-24 | 2023-02-22 | WTM | Hildreth Michaela | CAO, MD | A - Grant | $0.00 | +600 | 1,950 | +44% | $0 | |
| 2023-02-24 | 2023-02-22 | WTM | Rountree George Manning | CEO, Dir | A - Grant | $0.00 | +2,000 | 7,400 | +37% | $0 | |
| 2023-02-23 | 2023-02-22 | WTM | Hicks Weston M | Dir | A - Grant | $0.00 | +56 | 1,056 | +6% | $0 | |
| 2023-01-03 | 2023-01-01 | WTM | Hildreth Michaela | CAO, MD | F - Tax | $1,414.33 | -176 | 1,634 | -10% | -$248.9K | |
| 2023-01-03 | 2023-01-01 | WTM | Rountree George Manning | CEO, Dir | F - Tax | $1,414.33 | -1,068 | 15.5K | -6% | -$1.51M | |
| 2023-01-03 | 2023-01-01 | WTM | CAMPBELL REID TARLTON | Pres | F - Tax | $1,414.33 | -710 | 14.1K | -5% | -$1.00M | |
| 2023-01-03 | 2023-01-01 | WTM | SEELIG ROBERT LAWRENCE | EVP, GC | F - Tax | $1,414.33 | -359 | 15.9K | -2% | -$507.7K | |
| 2022-12-29 | 2022-12-28 | WTM | DAVIS MORGAN W | Dir | G - Gift | $0.00 | -200 | 6,709 | -3% | $0 | |
| 2022-12-29 | 2022-12-28 | WTM | Hildreth Michaela | CAO, MD | G - Gift | $0.00 | -53 | 1,410 | -4% | $0 | |
| 2022-12-27 | 2022-12-22 | WTM | Hildreth Michaela | CAO, MD | S - Sale | $1,371.84 | -100 | 1,463 | -6% | -$137.2K | |
| 2022-09-22 | 2022-09-20 | WTM | DAVIS MORGAN W | Dir | S - Sale | $1,400.00 | -945 | 6,909 | -12% | -$1.32M | |
| 2022-09-22 | 2022-09-20 | WTM | Carlson Peter M | Dir | S - Sale | $1,400.00 | -200 | 788 | -20% | -$280.0K | |
| 2022-06-02 | 2022-06-01 | WTM | CAMPBELL REID TARLTON | Pres | G - Gift | $0.00 | -100 | 13.0K | -0.8% | $0 | |
| 2022-06-01 | 2022-05-31 | WTM | Hildreth Michaela | CAO, MD | S - Sale | $1,270.94 | -100 | 1,563 | -6% | -$127.1K | |
| 2022-05-27 | 2022-05-26 | WTM | CHOKSI MARY C | Dir | A - Grant | $0.00 | +225 | 1,363 | +20% | $0 | |
| 2022-05-27 | 2022-05-26 | WTM | Tanner David Allen | Dir | A - Grant | $0.00 | +225 | 1,613 | +16% | $0 | |
| 2022-05-27 | 2022-05-26 | WTM | DAVIS MORGAN W | Dir | A - Grant | $0.00 | +315 | 7,854 | +4% | $0 | |
| 2022-05-27 | 2022-05-26 | WTM | Dillon Margaret | Dir | A - Grant | $0.00 | +225 | 450 | +100% | $0 | |
| 2022-05-27 | 2022-05-26 | WTM | Carlson Peter M | Dir | A - Grant | $0.00 | +225 | 988 | +29% | $0 |
Purchase Sale Sale after option exercise All abbreviations