X0305 4 2012-05-14 0 0000927003 ADVANCED ENERGY INDUSTRIES INC AEIS 0001007705 SCHATZ DOUGLAS S P.O. BOX 481 FORT COLLINS CO 80522 1 0 0 0 Common Stock 2012-05-14 4 S 0 600 13.125 D 2695680 I By Trust Common Stock 2012-05-14 4 S 0 200 13.1275 D 2695480 I By Trust Common Stock 2012-05-14 4 S 0 1600 13.14 D 2693880 I By Trust Common Stock 2012-05-14 4 S 0 100 13.145 D 2693780 I By Trust Common Stock 2012-05-14 4 S 0 1565 13.15 D 2692215 I By Trust Common Stock 2012-05-14 4 S 0 200 13.155 D 2692015 I By Trust Common Stock 2012-05-14 4 S 0 967 13.16 D 2691048 I By Trust Common Stock 2012-05-14 4 S 0 600 13.165 D 2690448 I By Trust Common Stock 2012-05-14 4 S 0 2239 13.17 D 2688209 I By Trust Common Stock 2012-05-14 4 S 0 100 13.175 D 2688109 I By Trust Common Stock 2012-05-14 4 S 0 100 13.18 D 2688009 I By Trust Common Stock 2012-05-14 4 S 0 100 13.19 D 2687909 I By Trust Common Stock 2012-05-14 4 S 0 100 13.195 D 2687809 I By Trust Common Stock 2012-05-14 4 S 0 100 13.1975 D 2687709 I By Trust Common Stock 2012-05-14 4 S 0 800 13.20 D 2686909 I By Trust Common Stock 2012-05-14 4 S 0 300 13.205 D 2686609 I By Trust Common Stock 2012-05-14 4 S 0 100 13.21 D 2686509 I By Trust Common Stock 2012-05-14 4 S 0 200 13.215 D 2686309 I By Trust Common Stock 2012-05-14 4 S 0 1800 13.22 D 2684509 I By Trust Common Stock 2012-05-14 4 S 0 200 13.225 D 2684309 I By Trust Common Stock 2012-05-14 4 S 0 2900 13.23 D 2681409 I By Trust Common Stock 2012-05-14 4 S 0 1800 13.24 D 2679609 I By Trust Common Stock 2012-05-14 4 S 0 500 13.26 D 2679109 I By Trust Common Stock 2012-05-14 4 S 0 100 13.265 D 2679009 I By Trust Common Stock 2012-05-14 4 S 0 3200 13.27 D 2675809 I By Trust Common Stock 2012-05-14 4 S 0 400 13.275 D 2675409 I By Trust Common Stock 2012-05-14 4 S 0 4700 13.28 D 2670709 I By Trust Common Stock 2012-05-14 4 S 0 300 13.285 D 2670409 I By Trust Common Stock 2012-05-14 4 S 0 100 13.29 D 2670309 I By Trust Common Stock 2012-05-14 4 S 0 200 13.295 D 2670109 I By Trust Douglas S. Schatz and Jill E. Schatz, husband and wife, are co-trustees of the Family Trust and may be deemed to be indirect beneficial owners of the shares of AEIS common stock held directly by the Family Trust. Douglas S. Schatz is a director of AEIS. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Plan. /s/ Thomas O. McGimpsey (Attorney-in-Fact) 2012-05-15