X0306 4/A 2020-11-16 2020-11-18 0 0000926282 ADTRAN INC ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD HUNTSVILLE AL 35806 0 1 0 0 Chief Financial Officer Common Stock 2020-11-16 4 A 0 0 0 A 44144 D Common Stock 2020-12-01 4 A 0 20.63 12.71 A 44164.63 D Common Stock 2020-12-01 4 A 0 1.635 11.76 A 241.443 I 401(k) Plan Phantom Stock 2020-11-16 4 A 0 3051 0 A Common Stock 3051 20418.349 D Phantom Stock 2020-12-01 4 A 0 120.597 12.96 A Common Stock 120.597 20538.946 D On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 3,051 shares of common stock on November 16, 2020, which shares should have been reported as the acquisition of shares of Phantom stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction. Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock. 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 2020-12-03