X0306 4 2020-03-05 0 0000926282 ADTRAN INC ADTN 0001191219 STANTON THOMAS R C/O ADTRAN 901 EXPLORER BLVD. HUNTSVILLE AL 35806 1 1 0 0 Chairman and CEO Phantom Stock 2020-03-05 4 A 0 1069.17 0 A Common Stock 1069.17 97264.713 D Each share of phantom stock represents a right to receive one share of common stock at 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 the phantom stock account into an alternative investment at any time. Amy Moss, by power of attorney 2020-03-09