On January 21, 2008, ADTRAN, Inc. announced its financial results for the fiscal quarter ended December 31, 2007 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 February 7, 2008. The ex-dividend date is February 5, 2008 and the payment date is February 21, 2008.

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.

In addition, ADTRAN has posted supplemental information regarding revenues by product category, subcategory and segment, and stock-based compensation expense, for the fiscal quarter ended December 31, 2007 on the Investor Relations page of its website, www.adtran.com. A copy of the supplemental information is attached as Exhibits 99.2 and 99.3 hereto and incorporated by reference herein.

Item 9.01. Financial Statements and Exhibits.

(c) Exhibits.

The following exhibits are furnished as part of this Current Report on Form 8-K.

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 January 21, 2008.

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