By CapitalSnitch Research Desk · updated Oct 11, 2026 · data from SEC filings and official Congress disclosures
Insider activity at White Mountains Insurance Group Ltd has been all selling for a year now: about $20.8 million from three sellers, and zero buyers with their own money.
That's worth context: executives sell for plenty of routine reasons, from scheduled trading plans to tax bills. Buying is the rarer, more telling signal.
Looking at the quarterly pattern: No open-market insider buying or selling in the last full quarter. Insiders bought in 0 of the last 7 full quarters. Members of Congress reported 1 trade in WTM over the past two years (one member).
Are insiders buying or selling WTM stock?
In the last 12 months White Mountains Insurance Group Ltd insiders made open-market purchases worth about $0 and sales worth about $20.8 million. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
When was the last insider trade in WTM?
The most recent open-market insider trade in WTM was filed on 2025-12-22.
Has any member of Congress traded WTM?
Yes. Members of Congress reported 1 trades in WTM over the past two years. The full list is free on CapitalSnitch.
Free weekly email: the week's biggest insider buys and Congress trades, every Monday. No spam, one-click unsubscribe.
Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1).
Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).