WTM
WHITE MOUNTAINS INSURANCE GROUP LTD · Finance & Insurance · Market cap $5.3B
Insider Buying
$0
reported purchases (SEC code P)
Insider Selling
$20.8M
reported sales (SEC code S)
Unique Insiders
3
in the rolling window
Latest filing
Aug 31, 2026
CAMPBELL REID TARLTON
WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) has 29 SEC Form 4 filings (29 transaction rows) in the rolling window, disclosed by 3 distinct insiders. Most recent filing: Aug 31, 2026.
Inside the rolling window, 3 insiders at WHITE MOUNTAINS INSURANCE GROUP LTD reported no open-market purchases and 3 open-market sales totaling $20.8M. The most recent open-market filing is a sale of 10,000 shares by Director CAMPBELL REID TARLTON, dated Dec 19, 2025, worth $10.3M.
- Industry:Insurance - Diversified
- CEO:Liam Caffrey
- Employees:1,648
- HQ:Hamilton, NH, BM
- IPO:1985-10-23
| Source | |||||||
|---|---|---|---|---|---|---|---|
CAMPBELL REID TARLTONFirst filing | Director | Sale | 10,000 | $10.3M | Dec 22 | +6.1% | SEC ↗ |
Rountree George ManningFirst filing | Chief Executive Officer | Sale | 5,000 | $10.3M | Dec 22 | +6.1% | SEC ↗ |
Gelston Philip AFirst filing | Director | Sale | 165 | $338K | Dec 16 | +8.0% | SEC ↗ |
Earnings: last 7 quarters
Congress trading WTM 16 all-time
- RRep. Michael McCaulSale$1,001 - $15,0002026-06-18
- RRep. Michael T. McCaulSale$1,001 - $15,0002026-06-18
- RRep. Michael T. McCaulPurchase$15,001 - $50,0002025-09-22
- RRep. French HillPurchase$50,001 - $100,0002025-06-23
- RRep. Michael T. McCaulPurchase$15,001 - $50,0002025-01-23
- RRep. Michael T. McCaulSale$1,001 - $15,0002024-08-26
STOCK Act disclosures are filed up to 45 days after the trade. Amount is a disclosed range, not an exact figure.
Frequently asked questions
How many SEC Form 4 insider filings does WTM have?
WHITE MOUNTAINS INSURANCE GROUP LTD (WTM) has 29 SEC Form 4 filings (29 transaction rows) in the rolling 365-day window, disclosed by 3 distinct insiders. Most recent filing: Aug 31, 2026.
When was the most recent SEC Form 4 filing for WTM?
The most recent Form 4 filing for WTM on Tracefour is dated Aug 31, 2026.
What is the total insider buy and sell value at WTM in the current window?
Inside the rolling window, insiders at WTM bought $0 and sold $20.8M based on SEC Form 4 filings.
Can I get alerts for WTM insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at WHITE MOUNTAINS INSURANCE GROUP LTD (WTM). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
WHITE MOUNTAINS INSURANCE GROUP LTD is in the Finance & Insurance sector.