Sign In
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
|
|
Historical Insider Trades
| Date | Type | Person | Role | Amount |
|---|---|---|---|---|
|
Dec 19, 2025 Sell |
Campbell Reid Tarlton Director |
5 000 Value: $0 |
||
|
Dec 19, 2025 Sell |
Campbell Reid Tarlton Director |
5 000 Value: $10.3M |
||
|
Dec 19, 2025 Sell |
Rountree George Manning Chief Executive Officer |
5 000 Value: $10.3M |
||
|
Dec 16, 2025 Sell |
Gelston Philip A Director |
165 Value: $338.0K |
||
|
Nov 25, 2025 Sell |
Campbell Reid Tarlton Director |
50 Value: $0 |
||
|
Nov 10, 2025 Sell |
Tanner David Allen Director |
4 Value: $0 |
||
|
May 22, 2025 Buy |
Shank Suzanne F. Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Shank Suzanne F. Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Yi Steven Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Tanner David Allen Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Hicks Weston M Director |
210 Value: $377.5K |
||
|
May 22, 2025 Buy |
Gelston Philip A Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Dillon Margaret Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Choksi Mary C Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Carlson Peter M Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Campbell Reid Tarlton Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Campbell Reid Tarlton Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Carlson Peter M Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Choksi Mary C Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Dillon Margaret Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Gelston Philip A Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Hicks Weston M Director |
210 Value: $377.5K |
||
|
May 22, 2025 Buy |
Tanner David Allen Director |
150 Value: $269.6K |
||
|
May 22, 2025 Buy |
Yi Steven Director |
150 Value: $269.6K |
||
|
Feb 26, 2025 Buy |
Rountree George Manning Chief Executive Officer |
1 625 Value: $2.98M |
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
