X0202 4 2006-08-11 0000776867 WHITE MOUNTAINS INSURANCE GROUP LTD WTM 0001181385 CHOKEL CHARLES BERGEN C/O WHITE MOUNTAINS INSURANCE GROUP, LTD 80 SOUTH MAIN STREET HANOVER NH 03755 0 1 0 0 CFO - White Mountains Re Group Common Shares 2006-08-11 4 I 0 162 490.00 A 505 I By 401(k) Common Shares 2006-08-11 4 I 0 67 488.75 A 572 I By 401(k) Since February 10, 2004, the date of Reporting Person's last filing, Reporting Person acquired 66 WTM Common Shares under the Folksamerica and OneBeacon Insurance Group 401(k) Plans. WTM Common Shares are purchased at fair market value on the date of purchase. The information contained in this report is based on plan statements dated as of July 31, 2006. Dennis Beaulieu, By Power of Attorney 2006-08-15