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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934

Date of Report (date of earliest event reported): October 16, 2003

ADVANCED ENERGY INDUSTRIES, INC.

1625 Sharp Point Drive, Fort Collins, Colorado 80525
(Address of principal executive offices) (Zip Code)

(970) 221-4670

Not Applicable

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Item 12. Results of Operations and Financial Condition

On October 16, 2003 Advanced Energy Industries, Inc. (the “Company”) announced via press release the Company’s results for its three- and nine-month periods ended September 30, 2003. A copy of the Company’s press release is attached hereto as Exhibit 99.1.

The information in this Current Report on Form 8-K, including the exhibit, is furnished pursuant to Item 12 and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section. Furthermore, the information in this Current Report on Form 8-K, including the exhibit, shall not be deemed to be incorporated by reference into the filings of the Company under the Securities Act of 1933, as amended.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX