White Mountains elects Stephen Klar to board; board expands to 11

WHITE MOUNTAINS INSURANCE GROUP LTD

Stephen Klar elected director on Aug 26, 2026; board size increased from 10 to 11.
Klar is former President and Managing Partner of Wellington Management Group LLP.
Will serve until next annual meeting; receives standard non-employee director compensation.
CEO Liam Caffrey cited Klar's financial services experience as beneficial to owners.

item 5.02 item 9.01

Executive movements

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Appointed

Stephen Klar

director

WTM · WHITE MOUNTAINS INSURANCE GROUP LTD

Effective: 2026-08-26
Filed: August 27, 2026, 8:11 AM ET

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.

Key facts

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Executive change SEC 8-K Item 5.02 confidence 0.95

Stephen Klar was elected as director at WHITE MOUNTAINS INSURANCE GROUP LTD.

Action: elected
Role: director

Exact text from the filing

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.

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WHITE MOUNTAINS INSURANCE GROUP LTD filing history →

Source: SEC EDGAR

accession 0001628280-26-059191

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