On August 7, 2012, the Registrant issued a news release announcing financial results for the three and six months ended June 30, 2012. In addition, on the same date, the Alterra Capital Holdings Limited Investor Financial Supplement for the quarter ended June 30, 2012 was made available on the Registrant's website.

A copy of the news release and financial supplement are attached hereto as Exhibit 99.1 and Exhibit 99.2, respectively, and are incorporated herein by reference.

In accordance with general instruction B.2 to Form 8-K, the information set forth in this Item 2.02 (including Exhibit 99.1 and Exhibit 99.2) shall be deemed "furnished" and not "filed" with the Securities and Exchange Commission for the purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, and shall not be incorporated by reference into any filing under the Securities Act of 1933, as amended.

On August 7, 2012, the Registrant issued a news release announcing the declaration by the Board of Directors of a dividend of $0.16 per share and the approval by the Board of Directors of an increase in the Registrants share repurchase plan by an additional $100.0 million resulting in an aggregate amount currently authorized under the share repurchase plan of $204.6 million.

The news release is attached hereto as Exhibit 99.3 and incorporated herein by reference.

(d) Exhibits

99.1    News Release of Alterra Capital Holdings Limited, dated August 7, 2012,
        announcing financial results.

99.2    Investor Financial Supplement for the quarter ended June 30, 2012.

99.3    News Release of Alterra Capital Holdings Limited, dated August 7, 2012,
        announcing a dividend declaration and increase in share repurchase
        authorization.