[Registration No. 333-189895 PROSPECTUS SUPPLEMENT (To Prospectus dated August 13, 2013, as supplemented by Prospectus Supplement dated August 15, 2013) $50,000,000 Common Shares Canadian Solar Inc. We entered into a distribution agency agreement, dated August 15, 2013, with Credit Suisse Securities (USA) LLC, which we refer to as Credit Suisse or the sales agent, relating to our common shares, with]