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): April 17, 2006 ADTRAN, Inc. (Exact name of registrant as specified in its charter) Delaware 0-24612 63-0918200 (State of Incorporation) (Commission file number) (I.R.S. Employer (Identification Number) 901 Explorer Boulevard, Huntsville, Alabama 35806-2807 (Address of principal executive offices, including zip code) (256) 963-8000 (Registrant's telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): |_| Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |_| Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |_| Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Item 2.02. Results of Operations and Financial Condition. On April 17, 2006, ADTRAN, Inc. announced its financial results for the fiscal quarter ended March 31, 2006 and certain other information. ADTRAN also announced that its Board of Directors declared a quarterly cash dividend. The quarterly cash dividend is $0.09 per common share to be paid to holders of record at the close of business on May 4, 2006. The ex-dividend date is May 2, 2006 and the payment date is May 18, 2006. A copy of ADTRAN's press release announcing such financial results and other information is attached as Exhibit 99.1 hereto and incorporated by reference herein. Item 9.01. Financial Statements and Exhibits. (c) Exhibits. The following exhibit is furnished as part of this Current Report on Form 8-K. Exhibit Number Description -------------- ----------- 99.1 Press Release dated April 17, 2006 SIGNATURES Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on April 17, 2006. ADTRAN, Inc. (Registrant) By: /s/ James E. Matthews ------------------------------------- James E. Matthews Senior Vice President - Finance, Chief Financial Officer and Treasurer EXHIBIT INDEX Exhibit Number Description -------------- ----------- 99.1 Press Release dated April 17, 2006