X0508 4 2023-09-05 0 0000926282 ADTRAN Holdings, Inc. ADTN 0001371377 Wilson James Denson Jr C/O ADTRAN HOLDINGS, INC. 901 EXPLORER BOULEVARD HUNTSVILLE AL 35806-2807 0 1 0 0 Chief Revenue Officer 0 Common Stock 105309.486 D Common Stock 4256.614 I 401(k) Plan Phantom Stock 2023-09-05 4 A 0 184.511 A Common Stock 184.511 17799.841 D Stock Options 23.64 2023-11-02 Common Stock 20034 20034 D Represents shares of phantom stock of the Issuer that have been acquired through the automatic reinvestment of dividends paid on the Issuer's common stock held in the reporting person's account under the Issuer's equity deferral program. The phantom shares are issued to the reporting person six months after a separation of service from the Issuer in the form of whole shares of common stock, plus cash for any fractional shares. The options granted to the reporting person vested in four equal annual installments beginning on November 2, 2013. /s/ Dan Ragsdale, by power of attorney 2023-09-07