X0201 5 2003-12-31 0 0 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 VP & General Counsel Common Shares 1988-08-08 5 A 0 16 A 17 I By 401(k) WTM Common Shares acquired by the Reporting Person under the Folksamerica 401(k) Plan since January 18, 2003, the date of Reporting Person's last filing. WTM Common Shares were purchased at fair market value on the dates of purchase. The information contained in this report is based on a plan statement dated as of December 31, 2003. Dennis Beaulieu, by Power of Attorney 2004-02-10