X0303 4 2010-06-29 0001141719 ALTERRA CAPITAL HOLDINGS Ltd ALTE 0001047633 COOK ANDREW C/O ALTERRA CAPITAL HOLDINGS LIMITED ALTERRA HOUSE, 2 FRONT STREET HAMILTON, BERMUDA D0 HM 11 BERMUDA 0 1 0 0 EVP, Global Business Dev. Common Shares 2010-06-29 4 A 0 42882 0 A 252500 D The restricted stock award was granted by the Compensation Committee of the Board pursuant to Alterra Capital Holdings Limited's Amended and Restated 2006 Equity Incentive Plan. Sheila A. Gringley, Attorney-in-Fact 2010-07-01