X0306 4 2017-02-16 0000926282 ADTRAN INC ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD. HUNTSVILLE AL 35806 0 1 0 0 Sr VP, Global Operations Phantom Stock 2017-02-16 4 A 0 48.34 0 A Common stock 48.34 11836.183 D Each share of phantom stock represents a right to receive one share of common stock or the cash value thereof. The phantom stock becomes payable 6 months after the reporting person's separation of service with the Company. The reporting person may transfer his phantom stock account into an alternative investment at any time. The reporting person previously reported an acquisition on November 17, 2017 of 3,100 shares of Phantom Stock as reported on a Form 4 filed on November 18, 2016. The actual number of shares of Phantom Stock acquired on November 17, 2017 was 3,184. The correct amount of derivative securities beneficially owned currently reflects the correct amount. Gayle S. Ellis, by power of attorney 2017-03-03