X0304 4 2012-03-05 0 0000811596 KAISER ALUMINUM CORP KALU 0001227284 BARNESON JOHN C/O KAISER ALUMINUM CORP. 27422 PORTOLA PARKWAY SUITE 200 FOOTHILL RANCH CA 92610 0 1 0 0 Sr. VP - Corporate Development Common Stock, par value $0.01 per share 2012-03-05 4 F 0 4724 47.44 D 47251 D Common Stock, par value $0.01 per share 2012-03-05 4 A 0 494 0.00 A 47745 D Common Stock, par value $0.01 per share 2012-03-05 4 F 0 182 47.44 D 47563 D Common Stock, par value $0.01 per share 2012-03-05 4 A 0 4884 0.00 A 52447 D Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2012 of certain shares granted to the reporting person in 2009 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended. Shares earned upon the vesting on March 5, 2012 of certain performance shares granted to the reporting person in 2009 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended. On March 5, 2012, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of a certain pre-established performance goal for 2009 through 2011. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2012 of the above-referenced performance shares. Grant to the reporting person effective as of March 5, 2012, of restricted stock under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan. All restrictions will lapse on March 5, 2015 or earlier upon the occurrence of certain specified circumstances. /s/ Cherrie I. Tsai, with power of attorney for John Barneson. 2012-03-07