X0306 4/A 2018-11-18 2018-11-20 0000926282 ADTRAN INC ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD. HUNTSVILLE AL 35806 0 1 0 0 Sr VP, Global Operations Common Stock 2018-11-18 4 A 0 1662 0 A 12774 D Common Stock 226.941 I By 401(k) Plan Phantom Stock Common stock 16410.38 D On November 20, 2018, the reporting person filed a Form 4 incorrectly reporting the acquisition of 1,662 shares of Phantom Stock on November 18, 2018, which shares should have been reported as the acquisition of shares of Common Stock. In addition to correcting such transaction, this amendment shows the correct number of shares of Phantom Stock owned by the reporting person. /s/ Roger Shannon, by power of attorney 2018-11-20