X0304 4 2012-02-21 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 2012-02-21 4 S 0 400 11.945 D 3161199 I By Trust Common Stock 2012-02-21 4 S 0 399 11.95 D 3160800 I By Trust Common Stock 2012-02-21 4 S 0 100 11.9575 D 3160700 I By Trust Common Stock 2012-02-21 4 S 0 700 11.96 D 3160000 I By Trust Common Stock 2012-02-21 4 S 0 2100 11.965 D 3157900 I By Trust Common Stock 2012-02-21 4 S 0 2500 11.97 D 3155400 I By Trust Common Stock 2012-02-21 4 S 0 900 11.975 D 3154500 I By Trust Common Stock 2012-02-21 4 S 0 700 11.98 D 3153800 I By Trust Common Stock 2012-02-21 4 S 0 200 11.985 D 3153600 I By Trust Common Stock 2012-02-21 4 S 0 2601 11.99 D 3150999 I By Trust Common Stock 2012-02-21 4 S 0 1714 12.00 D 3149285 I By Trust Common Stock 2012-02-21 4 S 0 700 12.01 D 3148585 I By Trust Common Stock 2012-02-21 4 S 0 34 12.03 D 3148551 I By Trust Common Stock 2012-02-21 4 S 0 1200 12.04 D 3147351 I By Trust Common Stock 2012-02-21 4 S 0 600 12.06 D 3146751 I By Trust Common Stock 2012-02-21 4 S 0 100 12.065 D 3146651 I By Trust Common Stock 2012-02-21 4 S 0 100 12.07 D 3146551 I By Trust Common Stock 2012-02-21 4 S 0 200 12.075 D 3146351 I By Trust Common Stock 2012-02-21 4 S 0 133 12.08 D 3146218 I By Trust Common Stock 2012-02-21 4 S 0 600 12.09 D 3145618 I By Trust Common Stock 2012-02-21 4 S 0 200 12.10 D 3145418 I By Trust Common Stock 2012-02-21 4 S 0 160 12.11 D 3145258 I By Trust Common Stock 2012-02-21 4 S 0 200 12.12 D 3145058 I By Trust Common Stock 2012-02-21 4 S 0 373 12.13 D 3144685 I By Trust Common Stock 2012-02-21 4 S 0 100 12.14 D 3144585 I By Trust Common Stock 2012-02-21 4 S 0 300 12.15 D 3144285 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) 2012-02-23