X0202 4/A 2007-07-23 2007-07-23 1 0000898018 MOUNTAIN BANK HOLDING CO 623852100 0001232677 ZURCHER HANS R 1 0 0 0 Common Stock 2007-07-23 4 D 0 27378 D 0 D Employee Stock Option (Right to Buy) 10.4762 2007-07-23 4 D 0 4200 D 2015-11-21 Common Stock 4200 0 D Employee Stock Option (Right to Buy) 15 2007-07-23 4 D 0 400 D 2019-06-15 Common Stock 400 0 D Disposed of pursuant to merger agreement between issuer and Columbia Banking System, Inc. in exchange for 11,583 shares of Columbia Banking System common stock having a value of $23.54 per share based on the exchange ratio. This option, which provided for vesting in three equal annual installments beginning November 21, 2003, was assumed by Columbia Banking System, Inc. in the merger and replaced with an option to purchase 3,702 shares of Columbia Banking System common stock for $12.93 per share. This option, which provided for vesting in three equal annual installments beginning June 15, 2007, was assumed by Columbia Banking System, Inc. in the merger and replaced with an option to purchase 324 shares of Columbia Banking System common stock for $18.51 per share. Hans R. Zurcher 2007-07-23