White Mountains Insurance Group, Ltd. filed its Form 10-Q for the quarterly period ended September 30, 2026, with the SEC on November 5, 2026, reporting consolidated total assets of $13,362.6 million as of that date.

Key Highlights

  • Total assets of $13,362.6 million as of September 30, 2026, up from $12,306.5 million at December 31, 2025, according to the filing.
  • White Mountains's common shareholders' equity was reported at $5,353.1 million as of September 30, 2026, compared with $5,425.4 million at December 31, 2025.
  • 2,386,823 common shares outstanding as of November 2, 2026, including 31,665 restricted common shares not yet vested, per the filing.
  • P&C Insurance and Reinsurance (Ark/WM Outrigger) earned insurance premiums were $508.8 million for the three months ended September 30, 2026, versus $542.2 million for the same period in 2025.
  • Nine-month P&C earned premiums were $1,258.8 million for the nine months ended September 30, 2026, compared with $1,264.4 million for the nine months ended September 30, 2025.
  • Total liabilities increased to $7,136.3 million from $6,051.4 million at December 31, 2025, the filing disclosed.
  • Loss and loss adjustment expense reserves in the P&C segment rose to $2,747.4 million from $2,481.0 million at year-end 2025.

White Mountains Insurance Group Reports Q3 2026 Balance Sheet and Segment Results

White Mountains Insurance Group, Ltd. (NYSE:WTM), a Bermuda-incorporated holding company headquartered in Hanover, New Hampshire, filed its quarterly report for the period ended September 30, 2026. According to the filing, consolidated total assets grew to $13,362.6 million from $12,306.5 million at December 31, 2025. Total liabilities rose to $7,136.3 million from $6,051.4 million over the same interval, while redeemable noncontrolling interests remained at $131.5 million.

The filing reports that the company's P&C Insurance and Reinsurance segment, operating under Ark/WM Outrigger, was the largest contributor to total assets at $7,147.3 million as of September 30, 2026, up from $6,354.1 million at December 31, 2025. Within that segment, unearned insurance premiums rose to $1,427.4 million from $1,026.1 million, and reinsurance recoverables increased to $1,076.1 million from $836.1 million, the filing stated. The segment also carried contingent consideration liabilities of $400.0 million, up from $328.3 million at year-end 2025.

Other segments disclosed in the filing include Asset Management (Kudu), with total assets of $1,478.2 million; Financial Guarantee (HG Global), with total assets of $1,205.7 million; Specialty Insurance Distribution (Distinguished), with total assets of $720.9 million; and Services, Industrial and Consumer (WTM Partners), with total assets of $441.5 million. The filing noted that WTM Partners goodwill and other intangible assets grew to $262.7 million from $91.5 million at December 31, 2025. For the three months ended September 30, 2026, the Financial Guarantee segment reported total revenues of negative $21.5 million, which the filing attributes in part to a change in fair value of BAM Surplus Notes of negative $16.1 million and net realized and unrealized investment losses of $28.8 million.

What Was Disclosed

White Mountains Insurance Group filed its unaudited quarterly report covering the period ended September 30, 2026, disclosing consolidated balance sheet data, segment revenues, and share count information. Total assets were $13,362.6 million and common shareholders' equity was $5,353.1 million as of that date.