X0303 4 2011-04-04 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 2011-04-04 4 S 0 5500 16.00 D 3884939 I By Trust Common Stock 2011-04-04 4 S 0 4400 16.005 D 3880539 I By Trust Common Stock 2011-04-04 4 S 0 300 16.0075 D 3880239 I By Trust Common Stock 2011-04-04 4 S 0 400 16.009 D 3879839 I By Trust Common Stock 2011-04-04 4 S 0 2976 16.01 D 3876863 I By Trust Common Stock 2011-04-04 4 S 0 700 16.015 D 3876163 I By Trust Common Stock 2011-04-04 4 S 0 100 16.0175 D 3876063 I By Trust Common Stock 2011-04-04 4 S 0 100 16.019 D 3875963 I By Trust Common Stock 2011-04-04 4 S 0 2000 16.02 D 3873963 I By Trust Common Stock 2011-04-04 4 S 0 553 16.03 D 3873410 I By Trust Common Stock 2011-04-04 4 S 0 400 16.035 D 3873010 I By Trust Common Stock 2011-04-04 4 S 0 2000 16.04 D 3871010 I By Trust Common Stock 2011-04-04 4 S 0 200 16.045 D 3870810 I By Trust Common Stock 2011-04-04 4 S 0 100 16.049 D 3870710 I By Trust Common Stock 2011-04-04 4 S 0 600 16.05 D 3870110 I By Trust Common Stock 2011-04-04 4 S 0 200 16.055 D 3869910 I By Trust Common Stock 2011-04-04 4 S 0 500 16.06 D 3869410 I By Trust Common Stock 2011-04-04 4 S 0 100 16.065 D 3869310 I By Trust Common Stock 2011-04-04 4 S 0 200 16.07 D 3869110 I By Trust Common Stock 2011-04-04 4 S 0 500 16.10 D 3868610 I By Trust Common Stock 2011-04-04 4 S 0 100 16.11 D 3868510 I By Trust Common Stock 2011-04-04 4 S 0 400 16.115 D 3868110 I By Trust Common Stock 2011-04-04 4 S 0 1600 16.12 D 3866510 I By Trust Common Stock 2011-04-04 4 S 0 100 16.1225 D 3866410 I By Trust Common Stock 2011-04-04 4 S 0 700 16.13 D 3865710 I By Trust Common Stock 2011-04-04 4 S 0 100 16.138 D 3865610 I By Trust Common Stock 2011-04-04 4 S 0 2300 16.14 D 3863310 I By Trust Common Stock 2011-04-04 4 S 0 100 16.145 D 3863210 I By Trust Common Stock 2011-04-04 4 S 0 722 16.15 D 3862488 I By Trust Common Stock 2011-04-04 4 S 0 100 16.16 D 3862388 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) 2011-04-05