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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1141719	Alterra Capital Holdings Ltd	ALTE	Fire, Marine & Casualty Insurance (6331)	980584464

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1054153	Marston W Becker	C/O Alterra Capital Holdings Limited Alterra House, 2 Front Street Hamilton, Bermuda D0 HM 11	Chief Executive Officer	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Shares	Disposition	2012-08-15	7,142	$23.02	697,803	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Shares	2,000	Indirect	By Becker Family Limited partnership

Footnotes

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.00 to $23.05, inclusive. The reporting person undertakes to provide to Alterra Capital Holdings Limited, any security holder of Alterra Capital Holdings Limited, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2) to this Form 4.
The Reporting Person is the General Partner of the Becker Family Limited Partnership.