[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]

[QuickLinks -- Click here to rapidly navigate through this document Unless otherwise indicated or unless the context otherwise requires, "we," "us," "our company," "our" or "Canadian Solar" refers to Canadian Solar Inc., a Canadian company, its predecessor entities and its subsidiaries . "China" or "PRC" refers to the People's Republic of China, excluding Taiwan and the special administrative regions of] [Use these links to rapidly review the document CANADIAN SOLAR INC. Unaudited Condensed Consolidated Balance Sheets as of December 31, 2014 and September 30, 2015 F-2 Unaudited Condensed Consolidated Statements of Operations for the Nine Months Ended September 30, 2014 and 2015 F-3 Unaudited Condensed Consolidated Statements of Comprehensive Income for the Nine Months Ended September 30, 2014 and 2015] [FORM 6-K CANADIAN SOLAR INC. 545 Speedvale Avenue West ý o Form 20-F o o CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS Incorporation by Reference]

[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]