UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington D.C. 20549
Form 6-K
REPORT OF FOREIGN PRIVATE ISSUER
PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE
SECURITIES EXCHANGE ACT OF 1934
For the month of October 2009
Commission File Number: 001-33107
CANADIAN SOLAR INC.
No. 199 Lushan Road
Suzhou New District
Suzhou, Jiangsu 215129
People’s Republic of China
(Address of principal executive office)
Indicate by check mark whether the registrant files or will file annual reports under cover of Form
20-F or Form 40-F.
Form 20-F þ Form 40-F o
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by
Regulation S-T Rule 101(b)(1): o
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by
Regulation S-T Rule 101(b)(7): o
Indicate by check mark whether the registrant by furnishing the information contained in this Form
is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the
Securities Exchange Act of 1934.
Yes o No þ
If “Yes” is marked, indicate below the file number assigned to the registrant in connection with
Rule 12g3-2(b):
82- N/A
EXPLANATORY NOTES
This Current Report on Form 6-K includes (i) the unaudited condensed consolidated financial
statements for the six months ended June 30, 2008 and 2009 of Canadian Solar Inc. (the “Company”),
attached hereto as Exhibit 99.1, (ii) the Company’s management’s discussion and analysis of
financial condition and results of operations for the years ended December 31, 2006, 2007 and 2008
and the six months ended June 30, 2008 and 2009, attached hereto as Exhibit 99.2, (iii) the audited
consolidated financial statements as of December 31, 2008 and 2007 and for the years ended December
31, 2006, 2007 and 2008, recast for the retrospective application of adoption of the FASB Staff
Position APB No. 14-1 Accounting for Convertible Debt Instruments That May Be Settled in Cash upon
Conversion (Including Partial Cash Settlement (“FSP APB 14-1”), attached hereto as Exhibit 99.3,
and (iv) a consent letter of the Company’s independent registered public auditing firm, attached
hereto as Exhibit 99.4. The Company is filing this Form 6-K so that these items will be
incorporated by reference in the prospectus supplement to the prospectus included in the
registration statement on Form F-3 (File No. 333-152325).
Effective January 1, 2009, the Company adopted FSP APB 14-1, which requires recognition of
both the debt and equity components of convertible debt instruments with cash settlement features.
The debt component is required to be initially recognized at the fair value of a similar instrument
that does not have an associated equity component. The equity component is recognized as the
difference between the proceeds from the issuance of the note and the fair value of the debt
component. FSP APB 14-1 also requires an accretion of the resulting debt discount over the
expected life of the debt. In this Current Report on Form 6-K, the Company is filing its audited
consolidated financial statements as of December 31, 2008 and 2007 and for the years ended December
31, 2006, 2007 and 2008, which give effect to the retrospective application of the adoption of FSP
APB 14-1.
Based on the audited consolidated financial statements as of December 31, 2008 and 2007 and
for the years ended December 31, 2006, 2007 and 2008, recast for the retrospective application of
the adoption of FSP APBB14-1, and the unaudited condensed consolidated financial statements for the
six months ended June 30, 2008 and 2009, the Company has prepared its selected consolidated
financial and operating data and management’s discussion and analysis of financial condition and
results of operations for the years ended December 31, 2006, 2007 and 2008 and the six months ended
June 30, 2008 and 2009, which are included in this Form 6-K as Exhibit 99.2 to be incorporated by
reference in the prospectus supplement to the prospectus included in the registration statement on
Form F-3 (File No. 333-152325).
In addition, the Company is including with this Current Report on Form 6-K an exhibit
consisting of the consent from its independent registered public accounting firm.
This Form 6-K does not attempt to modify or update any other disclosure set forth in the
Company’s Annual Report on Form 20-F for the year ended December 31, 2008 that was filed with the
SEC on June 8, 2009, except as required to reflect the adoption of FSP APB 14-1.