X0306 4 2017-09-28 true 0001369817 OneBeacon Insurance Group, Ltd. OB 0001672525 Bridge Holdings (Bermuda) Ltd. C/O WHITE MOUNTAINS INSURANCE GROUP, LTD 80 SOUTH MAIN STREET HANOVER NH 03755 true Class B Common Shares 2017-09-28 4 D 0 14427449 18.1 D 0 D Disposition in connection with the merger between Intact Acquisition Co. Ltd. and OneBeacon Insurance Group, Ltd. ("OneBeacon") in which each outstanding Class B common share of OneBeacon was converted into the right to receive an amount in cash equal to $18.10 per share. /s/ Wesley C. Bell, by Power of Attorney 2017-09-28