Stephen Klar was appointed Director of White Mountains Insurance Group Ltd. As of November 6, 2026, White Mountains Insurance Group Ltd has reported one leadership change filing to the SEC under Item 5.02 of Form 8-K, on August 27, 2026, naming 1 appointment (Form 8-K, August 27, 2026).
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White Mountains Insurance Group Ltd reported a change among its directors and officers to the SEC on Form 8-K, Item 5.02, on 2026-08-27. It names 1 person. Every row below is cited to the filing it comes from, and this page adds each new change as White Mountains Insurance Group Ltd files it.
Also on the record for White Mountains Insurance Group Ltd
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| May 7, 2026 | Stake report, Schedule 13G/A, by Neuberger Berman Group LLC | 4.9% of the class | 5%+ stakes | Source |
| April 30, 2026 | Stake report, Schedule 13G, by Vanguard Capital Management | 5.18% of the class | 5%+ stakes | Source |
| March 27, 2026 | Stake report, Schedule 13G/A, by The Vanguard Group | — | 5%+ stakes | Source |
| February 12, 2026 | Stake report, Schedule 13G/A, by Morgan Stanley | 3% of the class | 5%+ stakes | Source |
| February 5, 2026 | Stake report, Schedule 13G, by Neuberger Berman Group LLC | 5.1% of the class | 5%+ stakes | Source |
| November 7, 2025 | Stake report, Schedule 13G/A, by Morgan Stanley | 5.2% of the class | 5%+ stakes | Source |
| August 7, 2025 | Stake report, Schedule 13G/A, by Morgan Stanley | 6.2% of the class | 5%+ stakes | Source |
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More on White Mountains Insurance Group Ltd and the records around it.
White Mountains Insurance Group Ltd elsewhere on the record
Companies that share a holder
- Neuberger Berman Group LLC also filed stake reports on 37 other companies: Stock Yards Bancorp, Inc. (Nov 2026), TRANSCAT INC (Nov 2026), Hagerty Inc CLass A (Oct 2026)
- Morgan Stanley also filed stake reports on 182 other companies: MDA Space Ltd. (Nov 2026), RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. (Oct 2026), Arbutus Biopharma Corp (Oct 2026)
- Vanguard Capital Management also filed stake reports on 1495 other companies: A10 Networks Inc (Oct 2026), Altisource Portfolio Solutions SA (Oct 2026), Alto Neuroscience Inc (Oct 2026)
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Timeline
| Filed | In / out | Person | Role | Effective | Source |
|---|---|---|---|---|---|
| 2026-08-27 | In | Director | 8-K, 2026-08-27 |
Who leads White Mountains Insurance Group Ltd, as last reported?
For each role that changed in the filings below, the most recent change reported. A role that did not change in these filings is not listed.
- Director: Stephen Klar, appointed (filed 2026-08-27).
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Find candidates like Director at White Mountains Insurance Group LtdEvery change, in the filing's words
Appointed: Stephen Klar, Director
On 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.
- In connection with Mr. Klar's election, the size of the Board was increased from 10 to 11 persons.
- Mr. Klar will hold office as a director on the Board until the Company's next annual meeting of shareholders and until his successor is elected and qualified or until his earlier resignation or removal.
- Mr. Klar will receive compensation for his service on the Board in accordance with the Company's standard compensatory arrangement for non-employee directors, including a pro-rated cash and common equity retainer for the remainder of the current year.
- A description of the Company's non-employee director compensation appears under the caption "Director Compensation" in the Company's Proxy Statement filed with the Securities and Exchange Commission on April 1, 2026.
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Where this comes from
A public company must file a current report on Form 8-K with the SEC within four business days when a director leaves or is elected, or when its chief executive, chief financial, chief accounting or chief operating officer, or another named executive, departs or is appointed. That disclosure goes under Item 5.02 of the report.
Every change on this page is taken from one of those filings and quoted in the company's own words, with a link to the filing, so it can be checked at the source. Where a filing names the person, the role and the date a change takes effect, they are shown beside the quote. Where it does not, the quote stands on its own. A filing states what changed; it rarely states why, and neither does this page.