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White Mountains Insurance Group

White Mountains Insurance Group (NYSE: WTM) insider transactions

In the twelve months to 10 November 2026, executives and directors of White Mountains Insurance Group reported 3 open-market sales of 10,165 shares ($10.6m) and 0 open-market purchases, by 3 people, according to the Form 4 filings they submitted to the SEC.

Latest transactions

The 20 most recent transactions in White Mountains Insurance Group shares reported on Form 4
DateInsiderRoleTransactionSharesPriceHeld afterFiling
31 August 2026Tanner David AllenDirectorGift−2—2,012Form 4
26 August 2026Klar StephenDirectorGrant or award+113—113Form 4
21 May 2026Campbell Reid TarltonDirectorGrant or award+135—10,575Form 4
21 May 2026Carlson Peter MDirectorGrant or award+135—852Form 4
21 May 2026Choksi Mary CDirectorGrant or award+135—1,993Form 4
21 May 2026Chu JohnDirectorGrant or award+135—335Form 4
21 May 2026Dillon MargaretDirectorGrant or award+135—1,080Form 4
21 May 2026Gelston Philip ADirectorGrant or award+135—1,703Form 4
21 May 2026Hicks Weston MDirectorGrant or award+190—2,936Form 4
21 May 2026Shank Suzanne F.DirectorGrant or award+135—1,006Form 4
21 May 2026Tanner David AllenDirectorGrant or award+135—2,014Form 4
19 March 2026Seelig Robert LawrenceEVP & General CounselGift−50—17,857Form 4
4 March 2026Tanner David AllenDirectorGift−225—1,879Form 4
25 February 2026Seelig Robert LawrenceEVP & General CounselGrant or award+775—2,500Form 4
25 February 2026Papamichael Michael AChief Financial OfficerGrant or award+500—1,200Form 4
25 February 2026Hildreth MichaelaMD & Chief Accounting OfficerGrant or award+600—1,825Form 4
25 February 2026Harrison Giles EPresidentGrant or award+775—2,675Form 4
25 February 2026Caffrey Liam PChief Executive OfficerGrant or award+1,500—3,650Form 4
1 January 2026Hildreth MichaelaMD & Chief Accounting OfficerShares withheld for tax−274$2,078.032,491Form 4
1 January 2026Caffrey Liam PChief Executive OfficerShares withheld for tax−425$2,078.031,655Form 4

Names appear as in the filing, surname first. A dash in the price column means the filing reports none, as in grants and gifts.

How to read the table

Only open-market purchases and sales are trades the insider chose to make at the market price, and they are the ones counted in the summary above. Grants, option exercises and shares withheld for tax come from pay plans. A sale marked as a 10b5-1 plan was scheduled in advance under a written plan.

Where each row comes from

From the Form 4 that each executive, director or large shareholder must file with the SEC within two business days of a transaction, read up to 10 November 2026. Each row links to its filing on EDGAR. Only transactions in shares are listed, not derivatives, and amended filings are left out. The accounts of the company are on the White Mountains Insurance Group page; the method, in data sources.

Information prepared from the Form 4 filings submitted to the SEC, for information purposes only. It is not financial advice or a recommendation to buy or sell. Updated on 12 November 2026.