WTMWhite Mountains Insurance Group, Ltd.

1. Aug 27, 2026On August 26, 2026, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Stephen Klar as a director of the Company.Director or officer change · Form 8-K
2. Jun 5, 20264 Board of Directors Reid Campbell Peter Carlson Mary Choksi John Chu Liam Caffrey Philip Gelston Weston Hicks Suzanne Shank David Tanner Margaret Dillon.Regulation FD disclosure · press release
3. May 21, 2026Mr. Steven M. Yi did not stand for re-election in 2026 as a director of White Mountains Insurance Group, Ltd. (the “Company”) and completed his tenure as a member of the Board of Directors of the Company on May 21, 2026 at the conclusion of his term.Director or officer change · Form 8-K
4. May 15, 2026On May 15, 2026, White Mountains Insurance Group, Ltd. (NYSE: WTM) (“White Mountains”) announced that HG Global Ltd. (“HGG”), a direct subsidiary of White Mountains, completed a private placement of $200,000,000 aggregate principal amount of fixed rate senior secured notes (the “New Notes”)Material agreement entered · Form 8-K
5. Apr 1, 2026(NYSE: WTM ) (“White Mountains”) announced that White Mountains Partners LLC (“WTM Partners”) has completed the acquisition of a majority interest in BaseSix Systems LLC, a low voltage electrical systems integrator.Other event · Form 8-K
6. Feb 26, 2026On February 26, 2026, White Mountains Insurance Group, Ltd. (NYSE: WTM) (“White Mountains”), RedBird Capital Partners (“RedBird”), and Bishop Street Underwriters (“Bishop Street”) issued a joint press release announcing that White Mountains has completed a $125 million structured capital investment into Bishop Street.Other event · Form 8-K
7. Jan 7, 2026(NYSE: WTM) (“White Mountains”) announced today that Ark Insurance Holdings Limited (“Ark”), its specialty property and casualty reinsurance and insurance subsidiary, has renewed Outrigger Re Ltd. ("Outrigger") for business incepted during calendar year 2026.Other event · Form 8-K
8. Dec 8, 2025On December 5, 2025, White Mountains Insurance Group, Ltd. (“White Mountains”) completed the previously announced sale of a controlling financial interest in WM Pierce Holdings, Inc. and its subsidiaries, including Bamboo Ide8 Insurance Services, LLC, (collectively, the “Bamboo Group”), to affiliates of funds advised …Acquisition or disposition completed · Form 8-K

Quoted from SEC EDGAR filings. A current report is filed within four business days of the event it describes.