Arch Capital (ACGL) 10-K 2007 FY Annual report

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Exhibit 32.2

Certification Pursuant to Chapter 63, Title 18 United States Code §1350
As Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

        In connection with the Annual Report of Arch Capital Group Ltd. (the "Company") on Form 10-K for the period ending December 31, 2007 as filed with the Securities and Exchange Commission on the date hereof (the "Report"), John D. Vollaro, as Executive Vice President, Chief Financial Officer and Treasurer of the Company, certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

the Report fully complies with the requirements of section 13(a) of the Securities Exchange Act of 1934; and



(2)

the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 29, 2008

/s/  JOHN D. VOLLARO      

John D. Vollaro

Executive Vice President,
Chief Financial Officer and Treasurer

A signed original of this written statement required by Section 906 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Arch Capital Group Ltd. and will be retained by Arch Capital Group Ltd. and furnished to the Securities and Exchange Commission or its staff upon request.

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Exhibit 32.2

Certification Pursuant to Chapter 63, Title 18 United States Code §1350 As Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002