X0304 4 2012-02-02 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 2012-02-02 4 S 0 800 10.92 D 3324218 I By Trust Common Stock 2012-02-02 4 S 0 1703 10.93 D 3322515 I By Trust Common Stock 2012-02-02 4 S 0 100 10.935 D 3322415 I By Trust Common Stock 2012-02-02 4 S 0 100 10.9375 D 3322315 I By Trust Common Stock 2012-02-02 4 S 0 1874 10.94 D 3320441 I By Trust Common Stock 2012-02-02 4 S 0 300 10.945 D 3320141 I By Trust Common Stock 2012-02-02 4 S 0 3000 10.95 D 3317141 I By Trust Common Stock 2012-02-02 4 S 0 700 10.955 D 3316441 I By Trust Common Stock 2012-02-02 4 S 0 1125 10.96 D 3315316 I By Trust Common Stock 2012-02-02 4 S 0 100 10.965 D 3315216 I By Trust Common Stock 2012-02-02 4 S 0 1700 10.97 D 3313516 I By Trust Common Stock 2012-02-02 4 S 0 300 10.98 D 3313216 I By Trust Common Stock 2012-02-02 4 S 0 1700 10.99 D 3311516 I By Trust Common Stock 2012-02-02 4 S 0 800 10.995 D 3310716 I By Trust Common Stock 2012-02-02 4 S 0 5390 11.00 D 3305326 I By Trust Common Stock 2012-02-02 4 S 0 700 11.005 D 3304626 I By Trust Common Stock 2012-02-02 4 S 0 100 11.0075 D 3304526 I By Trust Common Stock 2012-02-02 4 S 0 800 11.01 D 3303726 I By Trust Common Stock 2012-02-02 4 S 0 100 11.02 D 3303626 I By Trust Common Stock 2012-02-02 4 S 0 400 11.04 D 3303226 I By Trust Common Stock 2012-02-02 4 S 0 100 11.045 D 3303126 I By Trust Common Stock 2012-02-02 4 S 0 200 11.0475 D 3302926 I By Trust Common Stock 2012-02-02 4 S 0 1100 11.05 D 3301826 I By Trust Common Stock 2012-02-02 4 S 0 100 11.055 D 3301726 I By Trust Common Stock 2012-02-02 4 S 0 400 11.06 D 3301326 I By Trust Common Stock 2011-07-18 4 S 0 1100 11.065 D 3300226 I By Trust Common Stock 2011-07-18 4 S 0 975 11.07 D 3299251 I By Trust Common Stock 2012-02-02 4 S 0 501 11.08 D 3298750 I By Trust Common Stock 2012-02-02 4 S 0 1995 11.09 D 3296755 I By Trust Common Stock 2012-02-02 4 S 0 100 11.095 D 3296655 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) 2012-02-06