CSIQ [Canadian Solar] SC 13G/A: Dated: February 10, 2012 Columbia Wanger Asset Management,
[Dated: February 10, 2012 Columbia Wanger Asset Management, LLC Bruce H. Lauer Chief Operating Officer Columbia Acorn Trust Bruce H. Lauer Vice President, Treasurer and Secretary EX-99.1 2 d296949dex991.htm JOINT FILING AGREEMENT] [1 NAMES OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY): Columbia Wanger Asset Management, LLC 04-3519872 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) ¨ ¨ (a) 3]