X0303 4 2011-05-16 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 2011-05-16 4 S 0 200 14.09 D 3691129 I By Trust Common Stock 2011-05-16 4 S 0 300 14.10 D 3690829 I By Trust Common Stock 2011-05-16 4 S 0 300 14.105 D 3690529 I By Trust Common Stock 2011-05-16 4 S 0 500 14.11 D 3690029 I By Trust Common Stock 2011-05-16 4 S 0 400 14.115 D 3689629 I By Trust Common Stock 2011-05-16 4 S 0 1500 14.12 D 3688129 I By Trust Common Stock 2011-05-16 4 S 0 800 14.125 D 3687329 I By Trust Common Stock 2011-05-16 4 S 0 100 14.1275 D 3687229 I By Trust Common Stock 2011-05-16 4 S 0 1600 14.13 D 3685629 I By Trust Common Stock 2011-05-16 4 S 0 900 14.14 D 3684729 I By Trust Common Stock 2011-05-16 4 S 0 500 14.145 D 3684229 I By Trust Common Stock 2011-05-16 4 S 0 200 14.15 D 3684029 I By Trust Common Stock 2011-05-16 4 S 0 1500 14.16 D 3682529 I By Trust Common Stock 2011-05-16 4 S 0 300 14.165 D 3682229 I By Trust Common Stock 2011-05-16 4 S 0 700 14.19 D 3681529 I By Trust Common Stock 2011-05-16 4 S 0 100 14.195 D 3681429 I By Trust Common Stock 2011-05-16 4 S 0 1700 14.20 D 3679729 I By Trust Common Stock 2011-05-16 4 S 0 100 14.205 D 3679629 I By Trust Common Stock 2011-05-16 4 S 0 1300 14.21 D 3678329 I By Trust Common Stock 2011-05-16 4 S 0 800 14.22 D 3677529 I By Trust Common Stock 2011-05-16 4 S 0 200 14.23 D 3677329 I By Trust Common Stock 2011-05-16 4 S 0 488 14.25 D 3676841 I By Trust Common Stock 2011-05-16 4 S 0 500 14.28 D 3676341 I By Trust Common Stock 2011-05-16 4 S 0 550 14.29 D 3675791 I By Trust Common Stock 2011-05-16 4 S 0 3608 14.30 D 3672183 I By Trust Common Stock 2011-05-16 4 S 0 500 14.32 D 3671683 I By Trust Common Stock 2011-05-16 4 S 0 1000 14.33 D 3670683 I By Trust Common Stock 2011-05-16 4 S 0 100 14.345 D 3670583 I By Trust Common Stock 2011-05-16 4 S 0 1800 14.35 D 3668783 I By Trust Common Stock 2011-05-16 4 S 0 200 14.355 D 3668583 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) 2011-05-17