WTM insider buying and SEC filings, explained
White Mountains Insurance Group Ltd. · CIK 776867
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$20.8M
Planned sales (10b5-1)
$0
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Dec 19, 2025 | Sale Amended filing | Reid Tarlton Campbell (Director) sold 5,000 shares at $2,050.00 ($10.3M). Holdings down 32% to 10,440 shares. Not marked as a 10b5-1 plan trade. This amends a filing from Dec 22, 2025. | SEC filing Filed Dec 22, 2025 |
| Dec 19, 2025 | Sale | George Manning Rountree (CEO and Director) sold 5,000 shares at $2,050.00 ($10.3M). Holdings down 27% to 13,809 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 22, 2025 |
| Dec 16, 2025 | Sale | Philip A Gelston (Director) sold 165 shares at $2,048.51 ($338K). Holdings down 10% to 1,568 shares. Not marked as a 10b5-1 plan trade. | SEC filing Filed Dec 16, 2025 |
25 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
No 8-K filings in the last 12 months.
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow WTM in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.