X0303 4 2011-04-11 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 2011-04-11 4 S 0 500 14.885 D 3858688 I By Trust Common Stock 2011-04-11 4 S 0 900 14.89 D 3857788 I By Trust Common Stock 2011-04-11 4 S 0 600 14.895 D 3857188 I By Trust Common Stock 2011-04-11 4 S 0 100 14.897 D 3857088 I By Trust Common Stock 2011-04-11 4 S 0 100 14.898 D 3856988 I By Trust Common Stock 2011-04-11 4 S 0 2700 14.90 D 3854288 I By Trust Common Stock 2011-04-11 4 S 0 600 14.905 D 3853688 I By Trust Common Stock 2011-04-11 4 S 0 4440 14.91 D 3849248 I By Trust Common Stock 2011-04-11 4 S 0 1800 14.92 D 3847448 I By Trust Common Stock 2011-04-11 4 S 0 400 14.925 D 3847048 I By Trust Common Stock 2011-04-11 4 S 0 1530 14.93 D 3845518 I By Trust Common Stock 2011-04-11 4 S 0 100 14.935 D 3845418 I By Trust Common Stock 2011-04-11 4 S 0 601 14.94 D 3844817 I By Trust Common Stock 2011-04-11 4 S 0 1000 14.95 D 3843817 I By Trust Common Stock 2011-04-11 4 S 0 401 14.96 D 3843416 I By Trust Common Stock 2011-04-11 4 S 0 808 14.97 D 3842608 I By Trust Common Stock 2011-04-11 4 S 0 300 14.98 D 3842308 I By Trust Common Stock 2011-04-11 4 S 0 1000 15.00 D 3841308 I By Trust Common Stock 2011-04-11 4 S 0 200 15.02 D 3841108 I By Trust Common Stock 2011-04-11 4 S 0 100 15.04 D 3841008 I By Trust Common Stock 2011-04-11 4 S 0 2100 15.075 D 3838908 I By Trust Common Stock 2011-04-11 4 S 0 800 15.08 D 3838108 I By Trust Common Stock 2011-04-11 4 S 0 300 15.085 D 3837808 I By Trust Common Stock 2011-04-11 4 S 0 300 15.09 D 3837508 I By Trust Common Stock 2011-04-11 4 S 0 1234 15.10 D 3836274 I By Trust Common Stock 2011-04-11 4 S 0 1000 15.11 D 3835274 I By Trust Common Stock 2011-04-11 4 S 0 300 15.125 D 3834974 I By Trust Common Stock 2011-04-11 4 S 0 700 15.13 D 3834274 I By Trust Common Stock 2011-04-11 4 S 0 900 15.135 D 3833374 I By Trust Common Stock 2011-04-11 4 S 0 200 15.137 D 3833174 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) 2011-04-12