X0306 4 2020-12-01 0 0000926282 ADTRAN INC ADTN 0001637150 Jacqueline Hourigan Rice 901 EXPLORER BOULEVARD HUNTSVILLE AL 35806 1 0 0 0 Dividend Equivalent Rights 2020-12-01 4 A 0 64.783 0 A Common Stock 64.783 318.161 D Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock. Amy Moss, by power of attorney 2020-12-03