[Canadian Solar Updates 1Q10 Performance; Ontario, Canada, June 1, 2010 Preliminary First Quarter Operating Results The Company shipped an estimated 186.4 MW of modules during Q1 2010. 4Q09 and FY09 Revisions The Company may revise the 4Q09 net revenues numbers due to the company’s intention to recognize sales only after receiving full cash payments from certain customers and due to] [CANADIAN SOLAR INC. CANADIAN SOLAR INC. Shawn (Xiaohua) Qu Chairman, President and Chief Executive Officer 6-K 1 h04285e6vk.htm FORM 6-K]

[Canadian Solar Reports Fourth Quarter and Full Year 2009 Results Ontario, Canada, March 3, 2010 Financial Highlights • 4Q09 net revenues of $287.0 million, compared to 3Q09 net revenues of $213.1 million and 4Q08 revenues of $68.8 million. • 4Q09 shipments of 155.5 MW, compared to 3Q09 shipments of 102.6 MW and 4Q08 shipments of 19.6MW. 4Q09 gross margin of] [CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS CANADIAN SOLAR INC. Shawn (Xiaohua) Qu Chairman, President and Chief Executive Officer]

[Canadian Solar Reports Third Quarter 2009 Results Q309 Highlights • 87% increase in net revenues to $213.1 million, compared to Q209 net revenues of $114.2 million. • 113% increase in shipments of 102.6 MW, compared to Q209 shipments of 48.2 MW, setting a new quarterly shipping record. • Gross margin of 16.3%, compared to Q209 gross margin of 20.2% and] [CANADIAN SOLAR INC. Form 6-K TABLE OF CONTENTS EX-99.1 - Press Release CANADIAN SOLAR INC. Shawn (Xiaohua) Qu Chairman, President and]