COLUMBIA BANKING SYSTEM, INC. — Proxy Solicitation & Information Statement 2016

Mar 16, 2016

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SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant x

Filed by a Party other than the Registrant ¨

Check the appropriate box:

¨	Preliminary Proxy Statement
¨	Definitive Proxy Statement
x	Definitive Additional Materials
¨	Soliciting Material Pursuant to §240.14a-11(c) or §240.14a-12

COLUMBIA BANKING SYSTEM, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

x No fee required.

¨ Fee computed on table below per Exchange Act Rules 12a(6)(i)(1) and 0-11.

(1) Title of each class of securities to which transaction applies:

(2) Aggregate number of securities to which transaction applies:

(3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):

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(5) Total fee paid:

¨ Fee paid previously with preliminary materials.

¨ Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the Form or Schedule and the date of its filing.

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* Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the

Shareholder Meeting to Be Held on April 27, 2016

	Meeting Information
	Meeting Type: Annual Meeting
COLUMBIA BANKING SYSTEM, INC.	For holders as of: March 07, 2016
	Date: April 27, 2016	Time: 1:00 PM PDT
	Location: Greater Tacoma Convention and Trade
Center
	1500 Broadway
	Tacoma, Washington 98402

| Columbia Banking System, Inc c/o Broadridge PO Box
1342 Brentwood, NY 11717 |
| --- |
| This is not a ballot. You cannot use this notice to vote these
shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse
side). |
| We encourage you to access and review all of the important
information contained in the proxy materials before voting. |
| See the reverse side of
this notice to obtain proxy materials and voting instructions. |

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Before You Vote

How to Access the Proxy Materials

| Proxy Materials Available to VIEW or RECEIVE: |
| --- |
| 1. Notice & Proxy
Statement 2. AR/10K How
to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail
copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET : www.proxyvote.com 2) BY TELEPHONE : 1-800-579-1639 3) BY E-MAIL* : sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed
in the box marked by the arrow (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before April 13, 2016 to
facilitate timely delivery. |

How To Vote

Please Choose One of the Following Voting Methods

Vote In Person: Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.

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Voting items

The Board of Directors recommends you vote FOR the following:

1. Election of Directors

Nominees

1a David A. Dietzler

1b Melanie J. Dressel

1c Craig D. Eerkes

1d Ford Elsaesser

1e Mark A. Finkelstein

1f John P. Folsom

1g Thomas M. Hulbert

1h Michelle M. Lantow

1i Mae Fujita Numata

1j Elizabeth Seaton

1k William T. Weyerhaeuser

The Board of Directors recommends you vote FOR proposals 2 and 3.

1. To vote on an advisory (non-binding) resolution to approve the compensation of Columbia’s executive officers.

2. To vote on an advisory (non-binding) resolution to appoint Deloitte & Touche LLP as our independent registered public accounting firm for fiscal year ending 2016.

NOTE: Such other business as may properly come before the meeting or any adjournment thereof.

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