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Class B Shareholder
 Shares Held% O/SShare ChangeFiling Date
White Mountains Insurance Group, Ltd.71,754,738100.0645,26203/15/07
Top 10 Class A Shareholders
 Shares Held% O/S*Share ChangeFiling Date
JP Morgan Asset Management4,667,31320.0-123,33906/30/10
Advisory Research, Inc.4,195,72018.0-32,11806/30/10
River Road Asset Management, LLC1,657,8597.1169,75406/30/10
T. Rowe Price Associates, Inc.1,633,6007.0-20,10006/30/10
Wells Capital Management Inc.1,083,0504.612,20006/30/10
Vanguard Group, Inc.946,5214.19,81906/30/10
Dimensional Fund Advisors, LP887,5033.836,07706/30/10
BlackRock Institutional Trust Company, N.A.747,7283.2-107,97606/30/10
Fenimore Asset Management, Inc.506,0162.241,33306/30/10
OppenheimerFunds, Inc.304,3431.3299,34306/30/10
*% O/S of Class A Shares only
This page contains information from a third party site. Other than with respect to the Class B Shareholder, OneBeacon does not maintain or provide information directly to this site. OneBeacon makes no claims concerning the completion or accuracy of the information on the third party site and takes no responsibility for supplementing, updating, or correcting any such information.
Ownership data based on most recent publicly available data according to Thomson Financial.