White Mountains Insurance Group is pleased to announce their 2001 Annual Investor Meeting. All are welcome to attend, in person or via live or recorded webcast. Please follow the instructions below to join in via one of these methods. Event Date: Friday August 24, 2001 10 a.m. EDT All are welcome.

HAMILTON, Bermuda, July 25, 2001 - As a result of White Mountains' acquisition of OneBeacon Insurance Group (formerly CGU Insurance Group) on June 1, 2001, White Mountains' second quarter results will include the operations of OneBeacon for the one-month period ended June 30, 2001.

HAMILTON, Bermuda, June 12, 2001 – With the closing of the OneBeacon (formerly CGU) acquisition, a number of officers of the White Mountains Insurance Group have assumed new duties. Jack Byrne, formerly CEO of White Mountains, will no longer be an officer of White Mountains, but remains on the