X0306 4 2015-02-02 0 0000913077 AFFYMETRIX INC AFFX 0001323221 Weber David A C/O AFFYMETRIX, INC. 3420 CENTRAL EXPRESSWAY SANTA CLARA CA 95051 0 1 0 0 EVP, Chief Commercial Officer Common Stock 2015-02-02 4 A 0 40000 0 A 137424 D On February 2, 2015, this number of perfomance-based restricted stock units was determined to be earned with respect to the performance period ending December 31, 2014. These earned restricted stock units will vest over two years starting February 13, 2015. /s/ Siang H. Chin, Attorney-in-Fact for David Weber 2015-02-04