COLUMBIA BANKING SYSTEM, INC. — Director's Dealing 2013

Mar 8, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COLUMBIA BANKING SYSTEM INC (COLB)
CIK: 0000887343
Period of Report: 2013-03-08

Reporting Person: DRESSEL MELANIE J (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-03-08	Common Stock	S	200	$20.68	Disposed	76057	Direct
2013-03-08	Common Stock	S	200	$20.67	Disposed	75857	Direct
2013-03-08	Common Stock	S	300	$20.67	Disposed	75557	Direct
2013-03-08	Common Stock	S	300	$20.67	Disposed	75257	Direct
2013-03-08	Common Stock	S	200	$20.67	Disposed	75057	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2408	Indirect
Common Stock	8788	Indirect
Common Stock	51134	Indirect