On November 1, 2012, Arch Capital Group Ltd. issued a press release reporting its earnings and the availability of its third quarter financial supplement for the nine month period ended September 30, 2012. The press release and financial supplement are attached to this Current Report on Form 8-K as Exhibit 99.1 and Exhibit 99.2, respectively, and are incorporated herein by reference.

The information in this Current Report on Form 8-K, including the information set forth in Exhibit 99.1 and Exhibit 99.2, shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing

ITEM 9.01        Exhibits.



EXHIBIT NO.                                DESCRIPTION

99.1           Press Release dated November 1, 2012 announcing the earnings of Arch
               Capital Group Ltd. for the nine month period ended September 30,
               2012
99.2           Third Quarter 2012 Financial Supplement