Effective beginning with performance reporting for the December 31, 2011 year end (with the exception of Columbia Acorn Funds, effective April 30, 2012), in presenting performance information for newer share classes of a Fund, the Fund typically includes, for periods prior to the offering of such share classes, the performance of the Fund’s oldest share class (except as otherwise disclosed), adjusted to reflect any higher class-related operating expenses of the newer share classes, based on the expense ratios of those share classes for the Fund’s most recently completed fiscal year for which data is available at December 31, 2011 or, for funds and classes first offered after January 1, 2011, the expected expense differential at the time the newer share class is first offered. Actual expense differentials across classes will vary over time. The performance of the Fund’s newer share classes would have been substantially similar to the performance of the Fund’s oldest share class because all share classes of a Fund are invested in the same portfolio of securities, and would have differed only to the extent that the classes do not have the same expenses (although differences in expenses between share classes may change over time).

Prior to December 31, 2011 (and April 30, 2012 for Acorn Funds), in presenting performance information for a newer share class of certain Funds, the Fund would typically include, for periods prior to the offering of such newer share class, the performance of an older share class, the class-related operating expense structure of which was most similar to that of the newer share class, and for periods prior to the initial offering of such older share class, would include the performance of successively older share classes with successively less similar expense structures. Such performance information was not restated to reflect any differences in expenses between share classes and if such differences had been reflected, the performance shown might have been lower. Because, prior to December 31, 2011 (and April 30, 2012 for Acorn Funds), these Funds used a different methodology for presenting performance information for a newer share class, such performance information published before December 31, 2011 (and April 30, 2012 for Acorn Funds) may differ from corresponding performance information published after December 31, 2011 (and April 30, 2012 for Acorn Funds).

For certain funds, the returns shown also include the returns of a predecessor to the Fund. The table below identifies the predecessor fund for certain of these Funds and shows the periods when performance shown is that of the predecessor to that fund.