Flash FinanceUS
After hours S&P 5007,549.94+2.35% Nasdaq25,253.14+2.74% Dow 3052,389.75+2.15% Russell 20002,840.81+3.15% Nasdaq-10027,907.62+3.40% MidCap 4003,715.23+3.13% SmallCap 6001,722.37+2.89% VIX19.92-22.31% 10Y Yield4.86+0.10% Close of Nov 09, 2026
AI brief of an SEC Form 8-K · WHITE MOUNTAINS INSURANCE GROUP LTD (WTM)

White Mountains adds Stephen Klar to board, expanding it from 10 to 11 members

Neutral Impact 2 of 5 leadership Written later

White Mountains Insurance Group elected Stephen Klar, former President and Managing Partner of Wellington Management Group, as a director on August 26, 2026, raising the board from 10 to 11 members. The filing describes this as a routine board addition with standard non-employee director pay, and it discloses no financial results or transactions.

Key points

  • Board elected Stephen Klar as a director on August 26, 2026; board size increased from 10 to 11 persons
  • Klar was formerly President and a Managing Partner of Wellington Management Group LLP
  • Klar receives standard non-employee director compensation, including a pro-rated cash and common equity retainer for the rest of 2026
  • Filing states no arrangements with other persons and no material interest in related-party transactions

The filing

CompanyWHITE MOUNTAINS INSURANCE GROUP LTD (WTM)
Form8-K, current report
Filed with the SECAug 27, 2026, 8:11 AM ET
Accession number0001628280-26-059191

Items reported: 5.02 Director / Officer Change

Read the filing on SEC.gov ↗

Written by AI on Nov 9, 2026, 8:51 AM ET, from this filing only. Written later: this filing was briefed after the fact, when past filings were added to the site, so the brief may be read with hindsight; the filing itself is the record of what was known on August 27, 2026.

Briefs are written by AI from the filing text and can contain mistakes — open the filing before acting on anything. Impact (1-5) and tone are the AI's reading of the filing for shareholders, not a price forecast. Not investment advice.