Westport Innovations Offers 5M Common Shares

Westport Innovations Inc.

, announced today that it is offering to sell, subject to market and other conditions, 5,000,000 of its common shares in the United States and Canada pursuant to a preliminary prospectus supplement to its base shelf prospectus originally dated January 3, 2012. Copies of the U.S. preliminary prospectus supplement can be accessed through the SEC's website at www.sec.gov, and copies of the Canadian preliminary prospectus supplement are available at www.sedar.com.