WuXi PharmaTech (Cayman) Inc. filed with U.S. regulators on Tuesday for an initial public offering of 13.2 million American depositary shares at an expected price of $11 to $13 each.

The China-based, pharmaceutical and biotechnology research and development outsourcing company said Credit Suisse, JPMorgan and Jefferies & Co. are underwriting its IPO.

WuXi has applied to list its ADSs on the New York Stock Exchange under the symbol WX, according to the company's registration statement with the U.S. Securities and Exchange Commission. (Reporting by Karey Wutkowski)