X0306 4 2019-12-02 0 0000926282 ADTRAN INC ADTN 0001191219 STANTON THOMAS R 901 EXPLORER BLVD HUNTSVILLE AL 35806 1 1 0 0 CEO Phantom Stock 2019-12-02 4 A 0 942.058 0 A Common Stock 942.058 96195.543 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 six 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. Amy Moss, by power of attorney 2019-12-04