COLUMBIA BANKING SYSTEM, INC. — Director's Dealing 2012

Mar 14, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COLUMBIA BANKING SYSTEM INC (COLB)
CIK: 0000887343
Period of Report: 2012-03-09

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-03-09	Common Stock	S	400	$21.50	Disposed	68700	Direct
2012-03-09	Common Stock	S	100	$21.491	Disposed	68600	Direct
2012-03-09	Common Stock	S	100	$21.49	Disposed	68500	Direct
2012-03-09	Common Stock	S	400	$21.505	Disposed	68100	Direct
2012-03-09	Common Stock	S	600	$21.50	Disposed	67500	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2408	Indirect
Common Stock	8283	Indirect
Common Stock	51134	Indirect