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Buy WTM
White Mountains Insurance Group Stock Insider Power
Based on the 100 latest insides trades, we have calculated the insider power to be negative at -78.57. In total, the insiders bought 29.84K and sold 21.65K WTM shares in the last 100 trades. The insider score can be negative despite buy/sell ratio being positive. The score focuses on the quality of the trades.
Insider Power
|
-78.57 |
| ● Buy | 29.84K shares |
| ● Sell | 21.65K shares |
|
75% Buy Activity
Strong Negative Correlation
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Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
May 21, 2026 Buy |
Campbell Reid Tarlton Director |
135 Value: $288.8K |
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May 21, 2026 Buy |
Carlson Peter M Director |
135 Value: $288.8K |
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May 21, 2026 Buy |
Gelston Philip A Director |
135 Value: $288.8K |
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May 21, 2026 Buy |
Hicks Weston M Director |
190 Value: $406.4K |
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|
May 21, 2026 Buy |
Shank Suzanne F. Director |
135 Value: $288.8K |
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May 21, 2026 Buy |
Tanner David Allen Director |
135 Value: $288.8K |
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May 21, 2026 Buy |
Dillon Margaret Director |
135 Value: $288.8K |
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May 21, 2026 Buy |
Chu John Director |
135 Value: $288.8K |
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|
May 21, 2026 Buy |
Chu John Director |
0 Value: $0 |
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|
May 21, 2026 Buy |
Choksi Mary C Director |
135 Value: $288.8K |
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Mar 19, 2026 Sell |
Seelig Robert Lawrence EVP & General Counsel |
50 Value: $0 |
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Mar 04, 2026 Sell |
Tanner David Allen Director |
225 Value: $0 |
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Feb 25, 2026 Buy |
Seelig Robert Lawrence EVP & General Counsel |
775 Value: $1.72M |
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Feb 25, 2026 Buy |
Papamichael Michael A Chief Financial Officer |
500 Value: $1.11M |
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Feb 25, 2026 Buy |
Hildreth Michaela Md & Chief Accounting Officer |
600 Value: $1.33M |
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Feb 25, 2026 Buy |
Harrison Giles E President |
775 Value: $1.72M |
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Feb 25, 2026 Buy |
Caffrey Liam P Chief Executive Officer |
1 500 Value: $3.33M |
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Jan 01, 2026 Sell |
Hildreth Michaela Md & Chief Accounting Officer |
274 Value: $569.4K |
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Jan 01, 2026 Sell |
Papamichael Michael A Chief Financial Officer |
131 Value: $272.2K |
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Jan 01, 2026 Buy |
Papamichael Michael A Chief Financial Officer |
0 Value: $0 |
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Jan 01, 2026 Buy |
Papamichael Michael A Chief Financial Officer |
0 Value: $0 |
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|
Jan 01, 2026 Buy |
Papamichael Michael A Chief Financial Officer |
0 Value: $0 |
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|
Jan 01, 2026 Sell |
Seelig Robert Lawrence EVP & General Counsel |
398 Value: $827.1K |
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|
Jan 01, 2026 Sell |
Caffrey Liam P Chief Executive Officer |
425 Value: $883.2K |
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|
Dec 23, 2025 Sell |
Hildreth Michaela Md & Chief Accounting Officer |
60 Value: $0 |
About Insider Power
Insider Power is a proprietary algorithm developed by StockInvest.us to evaluate the significance of insider transactions. The calculation considers the size, type, and timing of transactions, as well as the insider’s role within the company.
It is important to note that, in general, there is little to no correlation between insider transactions and short-term stock price movements. In one of our studies, only 0.22%* of stocks with insider activity showed a measurable correlation — and even then, it was unclear whether the effect was caused by insider actions or simply by the stock’s broader trend.
While our algorithms are designed to highlight potentially meaningful signals, these cannot be regarded as statistically significant on their own. Insider trading activity should therefore be seen as informative rather than as direct trading guidance. The Insider Power metric was created to present this information in a clearer and more accessible way, helping investors better understand the possible context of insider activity.
* October 6th, 2025 - Tested on 5562 stocks
