NYSE:WTM

White Mountains Insurance Group Stock Insider Trading

Financial Services > Insurance - Property & Casualty

Buy WTM

*Your capital is at risk

$2,065.14

+49.60 (+2.46%)

At Close: Jun 05, 2026

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 (Last 100 transactions)	-78.57
● Buy	29.84K shares
● Sell	21.65K shares
75% Buy Activity Strong Negative Correlation
Sell Signal High Confidence Dec 19, 2025 Analysis Breakdown: Strongly supported by a very low Insider Power Score of -78.57. Partially supported by a negative historical correlation. Confidence increased due to high data reliability score of 100.

Historical Insider Trades

Date	Type	Person	Role	Amount
May 21, 2026 Buy	Common Shares A-Award	Campbell Reid Tarlton Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares A-Award	Carlson Peter M Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares A-Award	Gelston Philip A Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares A-Award	Hicks Weston M Director	Director	190 Value: $406.4K
May 21, 2026 Buy	Common Shares A-Award	Shank Suzanne F. Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares A-Award	Tanner David Allen Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares A-Award	Dillon Margaret Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares A-Award	Chu John Director	Director	135 Value: $288.8K
May 21, 2026 Buy	Common Shares	Chu John Director	Director	0 Value: $0
May 21, 2026 Buy	Common Shares A-Award	Choksi Mary C Director	Director	135 Value: $288.8K
Mar 19, 2026 Sell	Common Shares G-Gift	Seelig Robert Lawrence EVP & General Counsel	Officer	50 Value: $0
Mar 04, 2026 Sell	Common Shares G-Gift	Tanner David Allen Director	Director	225 Value: $0
Feb 25, 2026 Buy	Common Shares (restricted) A-Award	Seelig Robert Lawrence EVP & General Counsel	Officer	775 Value: $1.72M
Feb 25, 2026 Buy	Common Shares (Restricted) A-Award	Papamichael Michael A Chief Financial Officer	C-Suite Officer	500 Value: $1.11M
Feb 25, 2026 Buy	Common Shares (Restricted) A-Award	Hildreth Michaela Md & Chief Accounting Officer	Officer	600 Value: $1.33M
Feb 25, 2026 Buy	Common Shares (restricted) A-Award	Harrison Giles E President	CEO / President	775 Value: $1.72M
Feb 25, 2026 Buy	Common Shares (Restricted) A-Award	Caffrey Liam P Chief Executive Officer	CEO / President	1 500 Value: $3.33M
Jan 01, 2026 Sell	Common Shares F-InKind	Hildreth Michaela Md & Chief Accounting Officer	Officer	274 Value: $569.4K
Jan 01, 2026 Sell	Common Shares F-InKind	Papamichael Michael A Chief Financial Officer	C-Suite Officer	131 Value: $272.2K
Jan 01, 2026 Buy	Common Shares (Restricted)	Papamichael Michael A Chief Financial Officer	C-Suite Officer	0 Value: $0
Jan 01, 2026 Buy	Common Shares	Papamichael Michael A Chief Financial Officer	C-Suite Officer	0 Value: $0
Jan 01, 2026 Buy	Common Shares	Papamichael Michael A Chief Financial Officer	C-Suite Officer	0 Value: $0
Jan 01, 2026 Sell	Common Shares F-InKind	Seelig Robert Lawrence EVP & General Counsel	Officer	398 Value: $827.1K
Jan 01, 2026 Sell	Common Shares F-InKind	Caffrey Liam P Chief Executive Officer	CEO / President	425 Value: $883.2K
Dec 23, 2025 Sell	Common Shares G-Gift	Hildreth Michaela Md & Chief Accounting Officer	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

ABOUT WHITE MOUNTAINS INSURANCE GROUP LTD

White Mountains Insurance Group, Ltd., through its subsidiaries, provides insurance and other financial services in the United States. The company operates through five segments: HG Global/BAM, Ark, NSM, Kudu, and Other Operations. The HG Global/BAM segment provides insurance on municipal bonds issued to finance public purposes, such as schools, utilities, and transportation facilities, as well as reinsurance protection services. The Ark segment ...

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