X0306 4 2022-12-31 0 0000926282 ADTRAN Holdings, Inc. ADTN 0001300513 Foliano Michael C/O ADTRAN HOLDINGS, INC. 901 EXPLORER BOULEVARD HUNTSVILLE AL 35806-2807 0 1 0 0 Chief Financial Officer Common Stock 2022-12-31 4 F 0 19056 18.79 D 127157.366 D Common Stock 2022-12-31 4 D 0 20171 0.00 D 106986.366 D Common Stock 250.008 I 401(k) Plan Phantom Stock 2022-12-31 4 A 0 20171 0.00 A Common Stock 20171 41458.29 D Stock Options 15.33 2025-11-14 Common Stock 16934 16934 D Stock Options 18.97 2024-11-15 Common Stock 17307 17307 D Stock Options 23.64 2023-11-02 Common Stock 18062 18062 D Shares delivered to the Issuer for the payment of withholding taxes due upon the vesting of previously granted restricted stock units. Upon vesting 20,171 restricted stock units previously granted to the reporting person were deferred resulting in the reporting person's receipt of phantom stock pursuant to the Issuer's equity deferral program. Represents shares of phantom stock of the Issuer 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 14, 2015. The options granted to the reporting person vested in four equal annual installments beginning on November 15, 2014 The options granted to the reporting person vested in four equal annual installments beginning on November 2, 2013. Michael Foliano 2023-01-04