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## 12 Summarized Quarterly Financial Data (Unaudited) 

The following table presents unaudited quarterly operating results for each of ADTRAN’s last eight fiscal quarters. This information has been prepared by ADTRAN on a basis consistent with our audited financial statements and includes all adjustments, consisting only of normal recurring adjustments, considered necessary for a fair presentation of the data. 

## Unaudited Quarterly Operating Results 

(In thousands, except for per share amounts) 

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(1) Net income for the three months ended June 30, 2002, and September 30, 2002, includes other-than-temporary investment impairment charges, resulting in an after-tax loss of $853,992 and $6,576,573, respectively. 

(2) Assumes exercise of dilutive stock options calculated under the treasury stock method. 

