secwatch.observer — SEC 8-K summary
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Issuer:     WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
CIK:        0000776867
Form:       8-K
Filed at:   2026-08-27T12:11:33+00:00
Accession:  0001628280-26-059191
Event type: leadership
Sentiment:  neutral
Materiality: 0.30
Item codes: 5.02, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

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

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/776867/000162828026059191/0001628280-26-059191-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/776867/000162828026059191/wtm-20260826.htm
  HTML page:      https://secwatch.observer/filing/0001628280-26-059191

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer