X0306 4 2014-02-11 0 0000913077 AFFYMETRIX INC AFFX 0001485088 Last Andrew J. C/O AFFYMETRIX, INC. 3420 CENTRAL EXPRESSWAY SANTA CLARA CA 95051 0 1 0 0 EVP, Chief Operating Officer Common Stock 2014-02-11 4 A 0 35000 0 A 123559 D Common Stock 2014-02-13 4 A 0 20000 0 A 143559 D Option to Purchase Common Stock 7.55 2014-02-13 4 A 0 35000 0 A 2021-02-13 Common Stock 35000 35000 D On February 11, 2014, this number of perfomance-based restricted stock units was determined to be earned with respect to the performance period ending December 31, 2013. These earned restricted stock units will vest over four years starting February 25, 2014. This Form 4 does not include 40,000 performance-based restricted stock units granted on February 13, 2014. These shares will be reported on subsequent Form 4s if and when the performance criteria are met. Restricted stock units vest in equal annual installments over four years from the grant date of February 13, 2014. Stock option becomes exercisable in equal annual installments over four years from the grant date of February 13, 2014. /s/ Siang H. Chin, Attorney-in-Fact for Andrew J. Last 2014-02-13