X0306 4 2020-09-03 0 0000926282 ADTRAN INC ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD HUNTSVILLE AL 35806 0 1 0 0 CFO Common Stock 2020-09-03 4 A 0 1.974 0 A 239.808 I 401(k) Plan Phantom Stock 2020-09-03 4 A 0 143.618 0 A Common Stock 143.618 17367.349 D Dividends reinvested into common stock and held in 401(k) plan by Reporting Person. Each share of phantom stock represents a right to receive one share of common stock at the cash value thereof. Phantom stock held in a deferred compensation plan by the Reporting Person, which becomes payable six months after the Reporting Person's separation of service with the Company. The Reporting Person may transfer the phantom stock into an alternative investment at any time. Michael Foliano 2020-09-04