X0306 4 2021-11-30 0 0000926282 ADTRAN INC ADTN 0001327057 McCray Gregory James 901 EXPLORER BOULEVARD HUNTSVILLE AL 35806 1 0 0 0 Common Stock 2021-11-30 4 A 0 32.5 21.09 A 31786.706 D Dividend Equivalent Rights 2021-11-30 4 A 0 26.912 0 A Common Stock 26.912 114.476 D Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock. Dividend equivalent rights accrue when and as dividends are paid on the Company's common stock. The rights are paid in whole shares of common stock with the remainder paid in cash upon vesting of restricted stock units. Each dividend equivalent right is the equivalent of one share of the Company's common stock. Michael Foliano, by power of attorney 2021-12-02