ADTRAN, Inc. 401(k) Retirement Planhttps://pcaobus.org/form-ap-filings/9203/9203ADTRAN, Inc. 401(k) Retirement Plan92036/27/2017 7:51:28 AM2016043d215c-4481-4d4c-af0c-778b135ee270238PricewaterhouseCoopers LLP58876ADTRAN, Inc. 401(k) Retirement Plan926282ADTN0023800615David Hamilton Woodall0023800615True