COLUMBIA BANKING SYSTEM, INC.

In this Annual Report on Form 10-K, we refer to Columbia Banking System, Inc. as the "Company," "Columbia," "we," "us," "our," or similar references. Forward-Looking Statements This Annual Report on Form 10-K contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, which are intended to be covered by the safe harbor for "forward-looking statements" provided by the Private Securities Litigation Reform Act of 1995. These statements may include statements that expressly or implicitly predict future results, performance, or events. Statements other than statements of historical fact are forward-looking statements. You can find many of these statements by looking for words such as "anticipates," "expects," "believes," "estimates," "intends," "forecast," and words or phrases of similar meaning.