X0303 4 2011-05-02 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 2011-05-02 4 S 0 1100 13.71 D 3752661 I By Trust Common Stock 2011-05-02 4 S 0 400 13.715 D 3752261 I By Trust Common Stock 2011-05-02 4 S 0 200 13.719 D 3752061 I By Trust Common Stock 2011-05-02 4 S 0 2800 13.72 D 3749261 I By Trust Common Stock 2011-05-02 4 S 0 100 13.725 D 3749161 I By Trust Common Stock 2011-05-02 4 S 0 2000 13.73 D 3747161 I By Trust Common Stock 2011-05-02 4 S 0 2300 13.74 D 3744861 I By Trust Common Stock 2011-05-02 4 S 0 300 13.745 D 3744561 I By Trust Common Stock 2011-05-02 4 S 0 1900 13.75 D 3742661 I By Trust Common Stock 2011-05-02 4 S 0 1000 13.77 D 3741661 I By Trust Common Stock 2011-05-02 4 S 0 600 13.775 D 3741061 I By Trust Common Stock 2011-05-02 4 S 0 1200 13.78 D 3739861 I By Trust Common Stock 2011-05-02 4 S 0 792 13.79 D 3739069 I By Trust Common Stock 2011-05-02 4 S 0 100 13.795 D 3738969 I By Trust Common Stock 2011-05-02 4 S 0 200 13.805 D 3738769 I By Trust Common Stock 2011-05-02 4 S 0 1600 13.81 D 3737169 I By Trust Common Stock 2011-05-02 4 S 0 1087 13.82 D 3736082 I By Trust Common Stock 2011-05-02 4 S 0 450 13.83 D 3735632 I By Trust Common Stock 2011-05-02 4 S 0 100 13.84 D 3735532 I By Trust Common Stock 2011-05-02 4 S 0 100 13.86 D 3735432 I By Trust Common Stock 2011-05-02 4 S 0 500 13.865 D 3734932 I By Trust Common Stock 2011-05-02 4 S 0 100 13.87 D 3734832 I By Trust Common Stock 2011-05-02 4 S 0 200 13.88 D 3734632 I By Trust Common Stock 2011-05-02 4 S 0 600 13.885 D 3734032 I By Trust Common Stock 2011-05-02 4 S 0 1600 13.89 D 3732432 I By Trust Common Stock 2011-05-02 4 S 0 200 13.895 D 3732232 I By Trust Common Stock 2011-05-02 4 S 0 600 13.90 D 3731632 I By Trust Common Stock 2011-05-02 4 S 0 300 13.905 D 3731332 I By Trust Common Stock 2011-05-02 4 S 0 100 13.91 D 3731232 I By Trust Common Stock 2011-05-02 4 S 0 600 13.92 D 3730632 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) 2011-05-04