X0304 4 2012-02-21 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 2012-02-21 4 S 0 2100 11.73 D 3184351 I By Trust Common Stock 2012-02-21 4 S 0 300 11.74 D 3184051 I By Trust Common Stock 2012-02-21 4 S 0 100 11.745 D 3183951 I By Trust Common Stock 2012-02-21 4 S 0 200 11.75 D 3183751 I By Trust Common Stock 2012-02-21 4 S 0 200 11.755 D 3183551 I By Trust Common Stock 2012-02-21 4 S 0 1025 11.76 D 3182526 I By Trust Common Stock 2012-02-21 4 S 0 600 11.79 D 3181926 I By Trust Common Stock 2012-02-21 4 S 0 200 11.795 D 3181726 I By Trust Common Stock 2012-02-21 4 S 0 920 11.80 D 3180806 I By Trust Common Stock 2012-02-21 4 S 0 100 11.81 D 3180706 I By Trust Common Stock 2012-02-21 4 S 0 200 11.815 D 3180506 I By Trust Common Stock 2012-02-21 4 S 0 800 11.82 D 3179706 I By Trust Common Stock 2012-02-21 4 S 0 300 11.83 D 3179406 I By Trust Common Stock 2012-02-21 4 S 0 159 11.84 D 3179247 I By Trust Common Stock 2012-02-21 4 S 0 217 11.85 D 3179030 I By Trust Common Stock 2012-02-21 4 S 0 100 11.855 D 3178930 I By Trust Common Stock 2012-02-21 4 S 0 706 11.86 D 3178224 I By Trust Common Stock 2012-02-21 4 S 0 1300 11.865 D 3176924 I By Trust Common Stock 2012-02-21 4 S 0 1600 11.87 D 3175324 I By Trust Common Stock 2012-02-21 4 S 0 100 11.875 D 3175224 I By Trust Common Stock 2012-02-21 4 S 0 3500 11.88 D 3171724 I By Trust Common Stock 2012-02-21 4 S 0 500 11.885 D 3171224 I By Trust Common Stock 2012-02-21 4 S 0 2094 11.89 D 3169130 I By Trust Common Stock 2012-02-21 4 S 0 600 11.90 D 3168530 I By Trust Common Stock 2012-02-21 4 S 0 100 11.905 D 3168430 I By Trust Common Stock 2012-02-21 4 S 0 500 11.915 D 3167930 I By Trust Common Stock 2012-02-21 4 S 0 700 11.92 D 3167230 I By Trust Common Stock 2012-02-21 4 S 0 2400 11.93 D 3164830 I By Trust Common Stock 2012-02-21 4 S 0 400 11.935 D 3164430 I By Trust Common Stock 2012-02-21 4 S 0 2831 11.94 D 3161599 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) 2012-02-23