White Mountains Insurance Group LTD number of employees

White Mountains Insurance Group LTD reported 1,648 employees at December 31, 2025 in its latest annual report, up 755 (84.5%) on the year before. That compares with 1,648 at December 31, 2021. Revenue per employee was $2.3m.

Headcount by year

Fiscal year end	Employees	Change	Revenue per employee	Source
December 31, 2025	1,648	+755 (84.5%)	$2.3m	10-K, filed February 27, 2026
December 31, 2024	893	+111 (14.2%)	$2.5m	10-K, filed February 28, 2025
December 31, 2023	782	−21 (2.6%)	$2.8m	10-K, filed February 26, 2024
December 31, 2022	803	−845 (51.3%)	$1.4m	10-K, filed February 27, 2023
December 31, 2021	1,648	—	$372,816	10-K, filed February 28, 2022

What the annual reports say

HUMAN CAPITAL As of December 31, 2025, White Mountains employed 1,648 people (consisting of 85 people at the Company, WM Capital, its other intermediate holding companies, WM Advisors, WTM Partners and HG Global, 300 people at Ark, 17 people at Kudu, 288 people at Distinguished and 958 people at its consolidated Other Operating Businesses). 2025 annual report
HUMAN CAPITAL As of December 31, 2024, White Mountains employed 893 people (consisting of 82 people at the Company, WM Capital, its other intermediate holding companies, WM Advisors, WTM Partners and HG Global, 273 people at Ark, 17 people at Kudu, 170 people at Bamboo and 351 people at the consolidated Other Operating Businesses). 2024 annual report
HUMAN CAPITAL As of December 31, 2023, White Mountains employed 782 people (consisting of 68 people at the Company, WM Capital, its other intermediate holding companies, WM Advisors and HG Global, 88 people at BAM, 244 people at Ark, 16 people at Kudu, and 366 people at the consolidated Other Operating Businesses). 2023 annual report
HUMAN CAPITAL As of December 31, 2022, White Mountains employed 803 people (consisting of 70 people at the Company, WM Capital, its other intermediate holding companies, WM Advisors and HG Global, 87 people at BAM, 221 people at Ark, 15 people at Kudu, and 410 people at the consolidated Other Operating Businesses). 2022 annual report
HUMAN CAPITAL As of December 31, 2021, White Mountains employed 1,648 people (consisting of 70 people at the Company, WM Capital, its other intermediate holding companies, WM Advisors and HG Global, 84 people at BAM, 208 people at Ark, 999 people at NSM, 12 people at Kudu, and 275 people at the consolidated Other Operating Businesses). 2021 annual report

Headcount as the company states it in Item 1 of its annual report (some count full-time equivalents or exclude part-time and temporary staff), at the date it gives. Years where the report states no clear total are left out rather than estimated. Changes can reflect acquisitions and disposals as well as hiring and job cuts.

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Figures from White Mountains Insurance Group LTD's SEC filings (10-K and 10-Q), retrieved October 20, 2026. How we read and check them: methodology and data sources. Not investment advice. Back to White Mountains Insurance Group LTD.