X0306 4/A 2018-12-31 2019-01-03 0 0000926282 ADTRAN INC ADTN 0001264261 Walker Kathryn A 901 EXPLORER BLVD HUNTSVILLE AL 35806 1 0 0 0 Common Stock 2018-12-31 4 A 0 8318 0 A 27568 D The reporting person is filing this amendment to correct the number of shares of the Company's common stock beneficially owned after reported transaction. The previous reported total was 29,412 shares of the Company's common stock. Thomas Wardell, by power of attorney 2019-05-24