[QuickLinks -- Click here to rapidly navigate through this document CANADIAN SOLAR INC. Common Shares January 4, 2016 CREDIT SUISSE SECURITIES (USA) LLC Dear Sirs: 1. Introductory . Canadian Solar Inc., a corporation incorporated under the laws of Canada (" Company "), agrees with Credit Suisse Securities (USA) LLC (the " Manager ") to issue and sell from time to] [QuickLinks -- Click here to rapidly navigate through this document Barristers & Solicitors January 4, 2016 Canadian Solar Inc. Dear Sirs and Mesdames: Re: Form F-3 The facts, as we understand them, and upon which with your permission we rely in rendering the opinion herein, are set forth in the Registration Statement. In addition, in our capacity as counsel, we] [QuickLinks -- Click here to rapidly navigate through this document January 4, 2016 Canadian Solar Inc. Re: Canadian Solar Inc. Ladies and Gentlemen: We have acted as special United States tax counsel to Canadian Solar Inc., a Canadian company (the " Company "), in connection with the in connection with the offering (the " Offering ") of up to US$] [QuickLinks -- Click here to rapidly navigate through this document January 4, 2016 Canadian Solar Inc. Ladies and Gentlemen: We have acted as special People's Republic of China (" PRC ") legal counsel to Canadian Solar Inc. (the " Company ") in connection with the offering (the " Offering" ) of up to US$ 100,000,000 common shares of the Company] [FORM 6-K CANADIAN SOLAR INC. 545 Speedvale Avenue West ý Form 20-F o Form 40-F o o CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS Incorporation by Reference 3]

[Canadian Solar Announces At-The-Market Offering of Common Shares GUELPH, Ontario, January 4, 2016 - Sales, if any, of the common shares under the at-the-market equity offering program will be made from time to time, at the Company’s discretion, by means of ordinary broker transactions, including on the NASDAQ, in negotiated transactions at market prices, or as otherwise agreed with the] [FORM 6-K CANADIAN SOLAR INC. 545 Speedvale Avenue West Guelph, Ontario, Canada N1K 1E6 Form 20-F x o o o CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS 3 4]