White Mountains Insurance : 2026 Dividend Declaration

About this update from White Mountains Insurance Group, Ltd.

‌via email: [email protected]‌ Jennifer Moyer Chief Administrative Officer March 4, 2026 Barbara McWhirter Corporate Finance LOM Capital Limited The LOM Building 27 Reid Street Hamilton HM 11 Bermuda Dear Barbara: Please be advised that the Board of Directors of White Mountains Insurance Group, Ltd. adopted resolutions at a meeting held on February 26, 2026 to declare an annual common share dividend of one dollar ($1.00) per share, payable on March 25, 2026 to holders of common shares of record as of the close of business on March 16, 2025. ‌Please adjust your records accordingly. Sincerely, ‌Jennifer Moyer cc: BSX [email protected] John Sinkus - WTM [email protected] Corporate Headquarters: White Mountains Insurance Group, Ltd. A.S. Cooper Bldg., 26 Reid Street Hamilton HM 11, Bermuda Ph: 441-278-3160 ✯ Fax: 441-278-3170 Hanover Office: White Mountains Insurance Group, Ltd. 23 South Main Street, Suite 3B, Hanover, NH 03755 Ph: 603-640-2210 ✯ Fax: 603-640-2250 E-mail: [email protected]

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