X0306 4 2017-07-24 0000926282 ADTRAN INC ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD. HUNTSVILLE AL 35806 0 1 0 0 Sr VP, Global Operations Common Stock 2017-07-24 4 M 0 322 23.02 A 5417 D Common Stock 2017-07-24 4 S 0 322 23.70 D 5095 D Common Stock 2017-07-25 4 M 0 2546 23.02 A 7641 D Common Stock 2017-07-25 4 M 0 10132 23.02 A 17773 D Common Stock 2017-07-25 4 M 0 2751 15.29 A 20524 D Common Stock 2017-07-25 4 M 0 8249 15.29 A 28773 D Common Stock 2017-07-25 4 S 0 23678 23.7713 D 5095 D Incentive Stock Option (Right to Buy) 23.02 2017-07-24 4 M 0 322 0 D 2008-11-05 2017-11-05 Common Stock 322 2546 D Incentive Stock Option (Right to Buy) 23.02 2017-07-25 4 M 0 2546 0 D 2008-11-05 2017-11-05 Common Stock 2546 0 D Non-Qualified Stock Option (Right to Buy) 23.02 2017-07-25 4 M 0 10132 0 D 2008-11-05 2017-11-05 Common Stock 10132 0 D Incentive Stock Option (Right to Buy) 15.29 2017-07-25 4 M 0 2751 0 D 2009-11-06 2018-11-06 Common Stock 2751 0 D Non-Qualified Stock Option (Right to Buy) 15.29 2017-07-25 4 M 0 8249 0 D 2009-11-06 2018-11-06 Common Stock 8249 0 D The shares were sold in multiple transactions at prices ranging from $23.60 to $24.00. This amount represents the weighted average sale price of such transactions. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request by the Securities and Exchange Commission, the Issuer, or a security holder of the Issuer. Brandon Dang, by power of attorney 2017-07-26