Company:  ALTERRA CAPITAL HOLDINGS ...
Form Type:  4
Filing Date:  6/7/2012 
CIK:  0001141719 
Address:  ALTERRA HOUSE
2 FRONT STREET
 
City, State, Zip:  HAMILTON HM11,  HM 11 
Telephone:  (441) 295-8800 
Fiscal Year:  12/31 
Description of Business
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  FORM 4
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES