Director Campbell Reid Tarlton sold White Mountains Insurance Group Ltd. ($WTM) shares on the open market twice in the last year, totaling $2,050. His most recent sale occurred on December 19, 2025. He ranks 11,504th out of 11,678 insiders by sale value in our database, well below the average of $8.6 million across about 6.4 transactions per insider. Tarlton made no open market purchases during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec. 19, 2025 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | S | Common Shares | 5000 | $0.00 | 10,559.0000 | 2,542,300 | 32.14% | 0.20% |
| Dec. 19, 2025 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | S | Common Shares | 5000 | $2050.00 | 10,559.0000 | 2,542,300 | 32.14% | 0.20% |
| Nov. 25, 2025 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | G | Common Shares | 50 | $0.00 | 15,559.0000 | 2,542,300 | 0.32% | 0.00% |
| May 22, 2025 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | A | Common Shares | 150 | $0.00 | 15,609.0000 | 2,532,200 | 0.97% | 0.01% |
| May 23, 2024 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | A | Common Shares | 165 | $0.00 | 15,459.0000 | 2,527,300 | 1.08% | 0.01% |
| March 21, 2024 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | G | Common Shares | 55 | $0.00 | 15,294.0000 | 2,527,300 | 0.36% | 0.00% |
| Feb. 22, 2024 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | Director | A | Common Shares | 45 | $0.00 | 15,346.0000 | 2,527,300 | 0.29% | 0.00% |
| Jan. 1, 2024 | WHITE MOUNTAINS INSURANCE GROUP LTD | $WTM | CAMPBELL REID TARLTON | President | F | Common Shares | 710 | $1505.01 | 15,301.0000 | 2,527,300 | 4.43% | 0.03% |