Shearman & Sterling represented Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC, as joint bookrunning managers, and Deutsche Bank Securities Inc. as joint lead, in connection with Allied World Assurance Company Holdings, Ltd’s public offering of $300 million aggregate principal amount of its 5.50% Senior Notes due 2020.

Allied World is a Bermuda-based specialty insurance and reinsurance company that underwrites a diversified portfolio of property and casualty lines of business through business offices located in Bermuda, Hong Kong, Ireland, Singapore, Switzerland, the United Kingdom and the United States.