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Arch Capital Group Ltd.
Waterloo House, Ground Floor
100 Pitts Bay Road
Pembroke HM 08
Bermuda

November 3, 2017
U.S. Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549
 
Re:
Notice of Disclosure Filed in Exchange Act Annual Report Under Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Exchange Act
Ladies and Gentlemen:
Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Securities Exchange Act of 1934, as amended, notice is hereby provided that Arch Capital Group Ltd. has made disclosure pursuant to such provisions in its Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, which was filed with the U.S. Securities and Exchange Commission on November 3, 2017.
 
 
Sincerely,
 
/s/ Mark D. Lyons
Mark D. Lyons
Executive Vice President, Chief Financial Officer and Treasurer