X0306 4 2013-03-05 0 0000811596 KAISER ALUMINUM CORP KALU 0001551850 Bunin Pete C/O KAISER ALUMINUM CORP. 27422 PORTOLA PARKWAY SUITE 200 FOOTHILL RANCH CA 92610 0 1 0 0 SVP - Operations Common Stock, par value $0.01 per share 2013-03-05 4 A 0 4663 0.00 A 37241 D Common Stock, par value $0.01 per share 2013-03-05 4 A 0 2671 0.00 A 39912 D Common Stock, par value $0.01 per share 2013-03-05 4 F 0 752 61.12 D 39160 D Common Stock, par value $0.01 per share 2013-03-05 4 F 0 1781 61.12 D 37379 D Employee Stock Options (Right to Buy) 80.01 2017-04-03 Common Stock, par value $0.01 per share 1961 1961 D Grant to the reporting person effective as of March 5, 2013, of restricted stock under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan. All restrictions will lapse on March 5, 2016 or earlier upon the occurrence of certain specified circumstances. Shares earned upon the vesting on March 5, 2013 of certain performance shares granted to the reporting person in 2010 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended. On March 5, 2013, 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 2010 through 2012. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2013 of the above-referenced performance shares. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2013 of certain shares granted to the reporting person in 2010 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended. Stock option award granted on April 3, 2007 for 1,961 shares of common stock, with one-third of such options vested on each of the first, second and third anniversaries of the grant date. /s/ Cherrie I. Tsai, with power of attorney for Peter Bunin 2013-03-07