X0306 4 2016-02-20 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 2016-02-20 4 F 0 2811 76.25 D 17229 D Common Stock, par value $0.01 per share 2016-03-05 4 A 0 3368 0.00 A 20597 D Common Stock, par value $0.01 per share 2016-03-05 4 A 0 2922 0.00 A 23519 D Common Stock, par value $0.01 per share 2016-03-05 4 F 0 1127 80.46 D 22392 D Common Stock, par value $0.01 per share 36252 I By Barneson Family Trust Employee Stock Options (Right to Buy) 80.01 2017-04-03 Common Stock, par value $0.01 per share 2334 2334 D Shares withheld to satisfy the withholding tax obligations resulting from the recognition of income with respect to the outstanding grants of restricted stock to the reporting person effective March 5, 2013 and March 5, 2014 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended, upon the reporting person reaching age 65 on February 20, 2016 and such shares no longer being subject to a substantial risk of forfeiture for tax purposes. Grant to the reporting person effective as of March 5, 2016, of restricted stock under the Kaiser Aluminum Corporation Amended and Restated 2006 Equity and Performance Incentive Plan. All restrictions will lapse on March 5, 2019 or earlier upon the occurrence of certain specified circumstances. Shares earned upon the vesting on March 5, 2016 of certain performance shares granted to the reporting person in 2013 under the Kaiser Aluminum Corporation 2006 Equity and Performance Incentive Plan, as amended. On March 5, 2016, 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 2013 through 2015. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2016 of the above-referenced performance shares. Stock option award granted on April 3, 2007 for 2,334 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 John Barneson 2016-03-08