X0306 4 2022-09-01 0 0000926282 ADTRAN Holdings, Inc. ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD HUNTSVILLE AL 35806 0 1 0 0 Chief Financial Officer Common Stock 2022-09-01 4 P 0 0.943 20.62 A 248.901 I 401(k) Plan Common Stock 157405.366 D Phantom Stock 2022-09-01 4 P 0 82.579 23.01 A Common Stock 82.579 21194.739 D Stock Option 15.33 2025-11-14 Common Stock 16934 16934 D Stock Option 18.97 2024-11-15 Common Stock 17307 17307 D Stock Option 23.64 2023-11-02 Common Stock 18062 18062 D Reflects shares acquired through the automatic reinvestment of dividends paid on the issuer's common stock. 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 deferred compensation plan. The phantom shares become payable in cash six months after the reporting person's separation of service with the issuer. 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, by power of attorney 2022-09-06