X0202 4 2006-04-28 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 Vice Pres. & General Counsel Common Shares 2006-04-28 4 P 0 200 508.00 A 200 D Common Shares 90 I By 401(k) Since February 24, 2004, the date of Reporting Person's last filing, Reporting Person acquired 73 shares of WTM Common Shares under the Folksamerica 401(k) Plan. 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 March 31, 2006. Dennis Beaulieu, by Power of Attorney 2006-05-01