X0306 4 2018-01-01 0000776867 WHITE MOUNTAINS INSURANCE GROUP LTD WTM 0001188198 SEELIG ROBERT LAWRENCE C/O WHITE MOUNTAINS INSURANCE GROUP, LTD 80 SOUTH MAIN STREET HANOVER NH 03755 0 1 0 0 EVP & General Counsel Common Shares 2018-01-01 4 F 0 990 851.28 D 17496 D Common Shares (restricted) 4000 D Common Shares 5 I by wife and dependent children Common Shares 545 I By 401(k) On January 1, 2018, 2,500 restricted Common Shares became unrestricted. 990 of the Common Shares were withheld by the Company to satisfy the Reporting Person's tax obligations. Reflects accumulation of 5 Common Shares in Reporting Person's Company 401(k) account since his last filed report. Such Common Shares were purchased at fair market value on the date of purchase. The information in this report is based on a plan report dated as of January 2, 2018. Wesley C. Bell, by Power of Attorney 2018-01-03