X0303 4 2010-05-17 0 0000927003 ADVANCED ENERGY INDUSTRIES INC AEIS 0001228910 SCHATZ DOUGLAS S & SCHATZ JILL E FAMILY TRUST PO BOX 481 FORT COLLINS CO 80522 0 0 1 0 0001007705 SCHATZ DOUGLAS S P.O. BOX 481 FORT COLLINS CO 80522 1 0 0 0 0001328181 Schatz Jill E P.O. BOX 481 FORT COLLINS CO 80522 0 0 1 0 Common Stock 2010-05-17 4 S 0 300 12.8375 D 5343639 D Common Stock 2010-05-17 4 S 0 1100 12.84 D 5342539 D Common Stock 2010-05-17 4 S 0 400 12.845 D 5342139 D Common Stock 2010-05-17 4 S 0 200 12.847 D 5341939 D Common Stock 2010-05-17 4 S 0 200 12.8475 D 5341739 D Common Stock 2010-05-17 4 S 0 2800 12.85 D 5338939 D Common Stock 2010-05-17 4 S 0 300 12.86 D 5338639 D Common Stock 2010-05-17 4 S 0 600 12.87 D 5338039 D Common Stock 2010-05-17 4 S 0 900 12.88 D 5337139 D Common Stock 2010-05-17 4 S 0 1300 12.89 D 5335839 D Common Stock 2010-05-17 4 S 0 343 12.90 D 5335496 D Common Stock 2010-05-17 4 S 0 400 12.91 D 5335096 D Common Stock 2010-05-17 4 S 0 100 12.915 D 5334996 D Common Stock 2010-05-17 4 S 0 270 12.92 D 5334726 D Common Stock 2010-05-17 4 S 0 500 12.93 D 5334226 D Common Stock 2010-05-17 4 S 0 1100 12.94 D 5333126 D Common Stock 2010-05-17 4 S 0 2900 12.95 D 5330226 D Common Stock 2010-05-17 4 S 0 200 12.96 D 5330026 D Common Stock 2010-05-17 4 S 0 196 12.97 D 5329830 D Common Stock 2010-05-17 4 S 0 200 12.98 D 5329630 D Common Stock 2010-05-17 4 S 0 300 13.00 D 5329330 D Common Stock 2010-05-17 4 S 0 900 13.01 D 5328430 D Common Stock 2010-05-17 4 S 0 200 13.02 D 5328230 D Common Stock 2010-05-17 4 S 0 1300 13.03 D 5326930 D Common Stock 2010-05-17 4 S 0 101 13.04 D 5326829 D Common Stock 2010-05-17 4 S 0 300 13.06 D 5326529 D Common Stock 2010-05-17 4 S 0 300 13.07 D 5326229 D Common Stock 2010-05-17 4 S 0 300 13.08 D 5325929 D Common Stock 2010-05-17 4 S 0 100 13.11 D 5325829 D Common Stock 2010-05-17 4 S 0 100 13.13 D 1325729 D These shares are owned directly by Douglas S. Schatz & Jill E. Schatz Family Trust, a ten percent owner of the issuer, and indirectly by Douglas S. Schatz and Jill E. Schatz, co-trustees of the trust. Includes 26,350 shares of restricted stock units held directly by Douglas S. Schatz, who is a director of the Issuer. The Sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 Plan. /S/ Thomas O. McGimpsey (Attorney-in-Fact) 2010-05-19