X0306 4 2012-05-02 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 2012-05-02 4 A 0 8000 0.00 A 2666392 I By Trust Filing is late due to an administrative oversight by AEIS. 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. 8,000 RSUs granted on May 2, 2012 will vest 100% at the first anniversary of the grant date. Represents shares of restricted stock units. /s/ Thomas O. McGimpsey (Attorney-in-Fact) 2012-12-05