WTM
insider transactionsWHITE MOUNTAINS INSURANCE GROUP LTD — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
No open-market buys or sells this period. The trades below are grants, option exercises and gifts, which carry no market price.
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
All transactions
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Grant·A
Director
$0
135 sh
Own +7%
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Grant·A
Director
$0
135 sh
Own +15%
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Grant·A
Director
$0
190 sh
Own +7%
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Grant·A
Director
$0
135 sh
Own +9%
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Grant·A
Director
$0
135 sh
Own +14%
-
Grant·A
Director
$0
135 sh
Own +68%
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Grant·A
Director
$0
135 sh
Own +19%
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Grant·A
Director
$0
135 sh
Own +7%
-
Grant·A
Director
$0
135 sh
Own +1%
-
Grant·A
Director
$0
681 sh
Own +1%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| May 21, 2026 | David Allen Tanner | Grant A | 135 | $0 |
| May 21, 2026 | Suzanne F. Shank | Grant A | 135 | $0 |
| May 21, 2026 | Weston M Hicks | Grant A | 190 | $0 |
| May 21, 2026 | Philip A Gelston | Grant A | 135 | $0 |
| May 21, 2026 | Margaret Dillon | Grant A | 135 | $0 |
| May 21, 2026 | John Chu | Grant A | 135 | $0 |
| May 21, 2026 | Peter M Carlson | Grant A | 135 | $0 |
| May 21, 2026 | Mary C Choksi | Grant A | 135 | $0 |
| May 21, 2026 | Reid Tarlton Campbell | Grant A | 135 | $0 |
| Apr 1, 2026 | Mary C Choksi | Grant A | 681 | $0 |
About WTM insider trading
This page tracks insider transactions for WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.