---
schema_version: "secwatch.filing_event.v1"
accession: "0000776867-21-000019"
form_type: "8-K"
ticker: "WTM"
cik: "0000776867"
company_name: "WHITE MOUNTAINS INSURANCE GROUP LTD"
filed_at: "2021-10-12T23:59:59+00:00"
generated_at: "2026-06-28T21:39:15.904763+00:00"
event_type: "leadership"
sentiment: "positive"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# White Mountains elects Suzanne Shank to board; board expands to eight members

## Summary
- Effective October 10, 2021, board size increased from seven to eight directors.
- Ms. Shank is President, CEO and co-founder of Siebert Williams Shank & Co., an investment banking firm.
- She also serves on boards of CMS Energy, Rocket Companies, and several foundations.
- CEO Manning Rountree said her investment banking and municipal finance experience will benefit owners.

## SEC filing metadata
- accession: 0000776867-21-000019
- form_type: 8-K
- ticker: WTM
- cik: 0000776867
- company_name: WHITE MOUNTAINS INSURANCE GROUP LTD
- filed_at: 2021-10-12T23:59:59+00:00
- event_type: leadership
- sentiment: positive
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/776867/000077686721000019/0000776867-21-000019-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/776867/000077686721000019/wtm-20211010.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000776867-21-000019
- JSON: https://secwatch.observer/filing/0000776867-21-000019.json
- Plain text: https://secwatch.observer/filing/0000776867-21-000019.txt

## Key facts
- Executive change
  Suzanne Shank was elected as Director at WHITE MOUNTAINS INSURANCE GROUP LTD.
  - Action: elected
  - Role: Director
  source text: On October 10, 2021, the Board of Directors (the “Board”) of White Mountains Insurance Group, Ltd. (the “Company”) elected Suzanne Shank as a new director, effective immediately.
  evidence_url: https://www.sec.gov/Archives/edgar/data/776867/000077686721000019/0000776867-21-000019-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.