X0306 4 2012-12-31 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 Managing Dir & General Counsel Common Shares 2012-12-31 4 F 0 500 512.26 D 10120 D Common Shares (restricted) 5050 D Common Shares 5 I by wife and dependent children Common Shares 501 I By 401(k) Reflects payment of tax liability incident to the vesting of restricted shares by withholding of securities. Reflects accumulation of 46 WTM Common Shares in Reporting Person's Company 401(k) account since his last filed report. WTM Common Shares are purchased at fair market value on the date of purchase. The information in this report is based on a plan statement dated as of December 31, 2012. Jason R. Lichtenstein, by Power of Attorney 2013-01-02