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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 10-Q/A
 Amendment No. 2
 (Mark One)
 þ
    
    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.
 For the quarterly period ended March 31, 2011.
 or
 o
    
    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934.
 For the transition period from  to .
 Commission file number: 000-26966
 ADVANCED ENERGY INDUSTRIES, INC.
  Delaware
    
    84-0846841(State or other jurisdiction of incorporation
    
    (I.R.S. Employer Identification No.)or organization)
 1625 Sharp Point Drive, Fort Collins, CO
    
    80525(Address of principal executive offices)
    
    (Zip Code)
 (970) 221-4670
 þ o
 o o
  Large accelerated filer o
    
    Accelerated filer þ
    
    Non-accelerated filer o
    
    Smaller reporting company o(Do not check if a smaller reporting company)
 o þ




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TABLE OF CONTENTS  ITEM 6. EXHIBITSSIGNATUREINDEX TO EXHIBITSExhibit 10.1Exhibit 31.3Exhibit 31.4    Table of Contents  EXPLANATORY NOTE
   
 ITEM 6.
    
    EXHIBITS
 10.1
    
    
    Amendment to the Global Supply Agreement, dated as of
January 28, 2011, by and between Applied Materials,
Inc. and Advanced Energy Industries, Inc. +10.2
    
    
    Amendment to Leadership Corporate Incentive Plan.*(1)10.3
    
    
    Executive Change in Control Agreement, dated as of
January 1, 2011, by and between Advanced Energy
Industries, Inc. and Gregg Patterson. (1)31.1
    
    
    Certification of the Chief Executive Officer Pursuant
to Rule 13a-14(a) under the Securities Exchange Act of
1934, as adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002. (1)31.2
    
    
    Certification of the Principal Financial Officer
Pursuant to Rule 13a-14(a) under the Securities
Exchange Act of 1934, as adopted pursuant to Section
302 of the Sarbanes-Oxley Act of 2002. (1)31.3
    
    
    Certification of the Chief Executive Officer Pursuant
to Rule 13a-14(a) under the Securities Exchange Act of
1934, as adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.31.4
    
    
    Certification of the Principal Financial Officer
Pursuant to Rule 13a-14(a) under the Securities
Exchange Act of 1934, as adopted pursuant to Section
302 of the Sarbanes-Oxley Act of 2002.32.1
    
    
    Certification of the Chief Executive Officer Pursuant
to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002. (1)32.2
    
    
    Certification of the Principal Financial Officer
Pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of
2002. (1)
 (1)
    
    Incorporated by reference to the Registrants Current Report on Form 10-Q for the quarter
ended March 31, 2011 (File No. 000-26966), filed May 6, 2011.*
    
    Compensation Plan+
    
    Confidential treatment has been granted for portions of this agreement.




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##### Table of Contents



SIGNATURE
  ADVANCED ENERGY INDUSTRIES, INC.Dated: August 19, 2011
    /s/ Danny C. HerronDanny C. HerronExecutive Vice President & Chief Financial Officer




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##### Table of Contents



INDEX TO EXHIBITS
 10.1
    
    
    Amendment to the Global Supply Agreement, dated as of
January  28, 2011, by and between Applied Materials,
Inc. and Advanced Energy Industries, Inc. +10.2
    
    
    Amendment to Leadership Corporate Incentive Plan.*(1)10.3
    
    
    Executive Change in Control Agreement, dated as of
January 1, 2011, by and between Advanced Energy
Industries, Inc. and Gregg Patterson. (1)31.1
    
    
    Certification of the Chief Executive Officer Pursuant
to Rule 13a-14(a) under the Securities Exchange Act of
1934, as adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002. (1)31.2
    
    
    Certification of the Principal Financial Officer
Pursuant to Rule 13a-14(a) under the Securities
Exchange Act of 1934, as adopted pursuant to Section
302 of the Sarbanes-Oxley Act of 2002. (1)31.3
    
    
    Certification of the Chief Executive Officer Pursuant
to Rule 13a-14(a) under the Securities Exchange Act of
1934, as adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.31.4
    
    
    Certification of the Principal Financial Officer
Pursuant to Rule 13a-14(a) under the Securities
Exchange Act of 1934, as adopted pursuant to Section
302 of the Sarbanes-Oxley Act of 2002.32.1
    
    
    Certification of the Chief Executive Officer Pursuant
to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002. (1)32.2
    
    
    Certification of the Principal Financial Officer
Pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of
2002. (1)
 (1)
    
    Incorporated by reference to the Registrants Current Report on Form 10-Q for the quarter
ended March 31, 2011(File No. 000-26966), filed May 6, 2011.*
    
    Compensation Plan+
    
    Confidential treatment has been granted for portions of this agreement.