WHITE MOUNTAINS INSURANCE GROUP (WTM) stock: insider trades, news & valuation
Heavy sellingShare price and insider trades
WHITE MOUNTAINS INSURANCE GROUP insider trading at a glance (Oct 9, 2026): in the past 12 months, 0 insiders bought $0 and 3 sold $20.8M of WTM stock on the open market.
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WTM insider buying and selling by quarter
Open-market purchases (green, above the line) and sales (red, below), by trade date.
| Quarter | Bought | Purchases | Sold | Sales |
|---|---|---|---|---|
| Q4 2026 | — | 0 | — | 0 |
| Q3 2026 | — | 0 | — | 0 |
| Q2 2026 | — | 0 | — | 0 |
| Q1 2026 | — | 0 | — | 0 |
| Q4 2025 | — | 0 | $20.8M | 3 |
Valuation, profit and volume
Summary
Over the past 12 months, 0 WHITE MOUNTAINS INSURANCE GROUP LTD insiders reported open-market purchases totaling $0, while 3 insiders reported sales totaling $20.8M. 0 of 4 recorded sales were made under pre-scheduled Rule 10b5-1 trading plans, which are usually less informative than discretionary sales.
Insider transactions
Open-market purchases and sales.
| Filed | Insider | Type | Shares | Price | Value | Since | Score |
|---|---|---|---|---|---|---|---|
| Dec 22SEC | George Manning RountreeCEO | Sell | 5,00013,809 held (−27%) | $2,050.00 | $10.2M | +0.5% | — |
| Dec 22SEC | Reid Tarlton CampbellDirector | Sell | 5,00010,440 held (−32%) | $2,050.00 | $10.2M | +0.5% | — |
| Dec 22SEC | Reid Tarlton CampbellDirector | Sell | 5,00010,440 held (−32%) | — | $0 | — | — |
| Dec 16SEC | Philip A GelstonDirector | Sell | 1651,568 held (−10%) | $2,048.51 | $338K | +0.6% | — |
Insiders at WHITE MOUNTAINS INSURANCE GROUP LTD
| Insider | Bought | Sold | Last filing | Score |
|---|---|---|---|---|
| George Manning RountreeCEO | — | $10.2M | Dec 22, 2025 | — |
| Reid Tarlton CampbellDirector | — | $10.2M | Dec 22, 2025 | — |
| Philip A GelstonDirector | — | $338K | Dec 16, 2025 | — |
WTM stock: common questions
Are WHITE MOUNTAINS INSURANCE GROUP LTD insiders buying WTM stock?
In the past 12 months, 0 insiders reported open-market purchases of WTM worth $0.
Are WHITE MOUNTAINS INSURANCE GROUP LTD insiders selling WTM stock?
3 insiders reported sales worth $20.8M over the same period.
Where does this data come from?
Every transaction comes from Form 4 filings that insiders must submit to the SEC within two business days of a trade. We pull them from SEC EDGAR every night.
What is WTM's 52-week range?
Over the past year WTM has traded between $1,846.83 and $2,319.41. It last closed at $2,060.63 on Oct 9, 2026.