X0306 4 2014-11-01 0 0000887343 COLUMBIA BANKING SYSTEM INC COLB 0001290821 Elsaesser Ford 1301 ?A? STREET TACOMA WA 98402 1 0 0 0 Common Stock 2014-11-01 4 A 0 33096 A 33096 D Common Stock 2014-11-01 4 A 0 389 A 33485 I By Elsaesser, Jarzabek & Buchanan, Pension Fund ITF: Joseph Jarzabek Common Stock 2014-11-01 4 A 0 52 A 33537 I Elsaesser Jarzabek Pension Plan ITF: Lois Lapointe Common Stock 2014-11-01 4 A 0 5 A 33542 I ED Jones - Elsaesser Jarzabek Anderson Marks & Elliott Savings Plan UAD 2/1/83 FBO: Sherylee Foster Common Stock 2014-11-01 4 A 0 26 A 33568 I ED Jones - Elsaesser Jarzabek Anderson Marks & Elliott Savings Plan UAD 12/1/3 FBO Deborah Hillen Common Stock 2014-11-01 4 A 0 5 A 33573 I ED Jones - Elsaesser Jarzabek Anderson Marks & Elliott Savings Plan UAD 12/1/83 FBO: Darla L Kuhman In connection with the merger of Intermountain Community Bancorp ("Intermountain") with and into Columbia Banking System, Inc. ("Columbia") on November 1, 2014 pursuant to the Agreement and Plan of Merger, dated July 23, 2014, as amended, between Intermountain and Columbia (the "Merger"), the reporting person was entitled to receive, subject to proration, 33,096 shares of the Columbia common stock reported above, together with $3,549.56 in cash, in exchange for 45,254 shares of Intermountain common stock. In connection with the Merger, the reporting person was entitled to receive, subject to proration, 389 shares of the Columbia common stock reported above, together with $1,389.56 in cash, in exchange for 606 shares of Intermountain common stock. In connection with the Merger, the reporting person was entitled to receive, subject to proration, 52 shares of the Columbia common stock reported above in exchange for 72 shares of Intermountain common stock. In connection with the Merger, the reporting person was entitled to receive, subject to proration, 5 shares of the Columbia common stock reported above together with $18.34 in cash, in exchange for 8 shares of Intermountain common stock. In connection with the Merger, the reporting person was entitled to receive, subject to proration, 26 shares of the Columbia common stock reported above together with $94.01 in cash, in exchange for 41 shares of Intermountain common stock. In connection with the Merger, the reporting person was entitled to receive, subject to proration, 5 shares of the Columbia common stock reported above together with $20.64 in cash, in exchange for 9 shares of Intermountain common stock. On October 31, 2014, the trading day immediately prior to the November 1, 2014 effective date of the Merger, the closing price of Intermountain's common stock was $20.00 per share and the closing price of Columbia's common stock was $27.78 per share. /s/ Cathleen Dent, attorney-in-fact 2014-11-04