White Mountains Insurance Group, Ltd. filed a Form 8-K on August 27, 2026, reporting the election of Stephen Klar to its Board of Directors effective August 26, 2026.

Key Highlights

  • New director elected: Stephen Klar was elected to the Board of Directors of White Mountains Insurance Group, Ltd. on August 26, 2026.
  • Board size increased: In connection with Mr. Klar's election, the Board size was increased from 10 to 11 persons.
  • Term of service: Mr. Klar will hold office until the Company's next annual meeting of shareholders and until his successor is elected and qualified, or until his earlier resignation or removal.
  • Compensation: Mr. Klar will receive a pro-rated cash and common equity retainer for the remainder of the current year, consistent with the Company's standard compensatory arrangement for non-employee directors.
  • No special arrangements: The filing states there are no arrangements or understandings between Mr. Klar and any other persons pursuant to which he was elected as a director.

Stephen Klar Joins White Mountains Insurance Group Board

According to the filing, the Board of Directors of White Mountains Insurance Group, Ltd. (NYSE:WTM) voted on August 26, 2026, to elect Stephen Klar as a director. The action was reported under Item 5.02 of the Form 8-K, covering the departure of directors or certain officers, election of directors, appointment of certain officers, and compensatory arrangements of certain officers.

The company disclosed that the Board's size was formally expanded from 10 to 11 persons in connection with Mr. Klar's election. His term will run until the Company's next annual meeting of shareholders and until his successor is elected and qualified, or until his earlier resignation or removal. The filing states that Mr. Klar will be compensated in accordance with the Company's standard non-employee director arrangement, with a pro-rated cash and common equity retainer covering the remainder of the current year. A full description of that compensation structure, according to the filing, appears under the "Director Compensation" caption in the Company's Proxy Statement filed with the SEC on April 1, 2026.

The filing further states that Mr. Klar has no direct or indirect material interest in any transaction required to be disclosed pursuant to Item 404(a) of Regulation S-K. A press release announcing Mr. Klar's election, dated August 27, 2026, was attached as Exhibit 99.1 and incorporated by reference. The filing was signed by Michaela J. Hildreth, Managing Director and Chief Accounting Officer.

What Was Disclosed

White Mountains Insurance Group, Ltd. disclosed the election of Stephen Klar to its Board of Directors, an expansion of the Board from 10 to 11 members, and the applicable compensation terms for Mr. Klar as a non-employee director.