WTM SEC Form 4 filings
White Mountains Insurance Group Ltd Latest Insider Trading Activity
The most recent employee insider trading activity for White Mountains Insurance Group Ltd was on December 19, 2025, when Campbell Reid Tarlton (Director) reported a sale of 5,000 shares at $2,050.00 per share. For the past 2,732 days, WTM has had 16 total insider transactions represented in the displayed records. This page shows up to the 10 most recent SEC Form 4 filing records on a 6-hour delay. Sign up for real-time updates and access to 20 years of historic insider trading data.
Insider Trading For WTM Charted on Daily Candles. Scroll left or zoom out to load earlier candles (up to 2 years).
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| Ticker | Filing Date | Transaction Date | Company | Insider | Title | Transaction | Trade Count | Shares | Avg. Price | Total Value | Position Size Change | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2025-12-22 | 2025-12-19 | White Mountains Insurance Group Ltd | Campbell Reid Tarlton | Director | Sell | 1 | 5,000 | $2,050.00 | $10,250,000.00 | 32.38% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2025-12-22 | 2025-12-19 | White Mountains Insurance Group Ltd | Rountree George Manning | Chief Executive Officer | Sell | 1 | 5,000 | $2,050.00 | $10,250,000.00 | 26.58% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2025-12-16 | 2025-12-16 | White Mountains Insurance Group Ltd | Gelston Philip A | Director | Sell | 1 | 165 | $2,048.51 | $338,004.15 | 9.52% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2023-11-20 | 2023-11-17 | White Mountains Insurance Group Ltd | Hicks Weston M | Director | Buy | 5 | 1,000 | $1,480.56 | $1,480,557.33 | 10.79% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2022-12-27 | 2022-12-22 | White Mountains Insurance Group Ltd | Hildreth Michaela | MD & Chief Accounting Officer | Sell | 1 | 100 | $1,371.84 | $137,184.00 | 6.40% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2022-09-22 | 2022-09-20 | White Mountains Insurance Group Ltd | Carlson Peter M | Director | Sell | 1 | 200 | $1,400.00 | $280,000.00 | 20.24% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2022-09-22 | 2022-09-20 | White Mountains Insurance Group Ltd | Davis Morgan W | Director | Sell | 1 | 945 | $1,400.00 | $1,323,000.00 | 12.03% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2022-06-01 | 2022-05-31 | White Mountains Insurance Group Ltd | Hildreth Michaela | MD & Chief Accounting Officer | Sell | 1 | 100 | $1,270.94 | $127,094.00 | 6.01% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2021-02-11 | 2021-02-09 | White Mountains Insurance Group Ltd | Davis Morgan W | Director | Sell | 2 | 1,500 | $1,133.28 | $1,699,923.00 | 45.91% | View Filing |
| Unexplained: transactions without an ESPP, DRIP, 10b5-1, tax liability, or Explained M/S tag. WTM | 2019-03-27 | 2019-03-26 | White Mountains Insurance Group Ltd | Tanner David Allen | Director | Buy | 2 | 500 | $918.45 | $459,222.95 | 56.75% | View Filing |
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Alerts are based on public SEC filings and are provided for informational purposes only; they do not constitute financial advice.