X0306 4/A 2022-08-11 2022-08-15 0 0000926282 ADTRAN Holdings, Inc. ADTN 0001371377 Wilson James Denson Jr 901 EXPLORER BLVD HUNTSVILLE AL 35806 0 1 0 0 Chief Revenue Officer Common Stock 2022-08-11 4 M 0 5271 18.97 A 137526.153 D Common Stock 2022-08-11 4 S 0 5271 24.17 D 132255.153 D Common Stock 2022-08-11 4 M 0 6260 15.33 A 138515.153 D Common Stock 2022-08-11 4 S 0 6260 24.17 D 132255.153 D Common Stock 2022-08-11 4 M 0 19772 18.97 A 152027.153 D Common Stock 2022-08-11 4 S 0 19772 24.18 D 132255.153 D Common Stock 2022-08-11 4 M 0 12522 15.33 A 144777.153 D Common Stock 2022-08-11 4 S 0 12522 24.18 D 132255.153 D Common Stock 2022-08-11 4 S 0 3797 24.29 D 128458.153 D Common Stock 4117.411 I 401(k) Plan Incentive Stock Option (Right to Buy) 18.97 2022-08-11 4 M 0 5271 0 D 2024-11-15 Common Stock 5271 0 D Incentive Stock Option (Right to Buy) 15.33 2022-08-11 4 M 0 6260 0 D 2025-11-14 Common Stock 6260 0 D Non-Qualified Stock Option (Right to Buy) 18.97 2022-08-11 4 M 0 19772 0 D 2024-11-15 Common Stock 19772 0 D Non-Qualified Stock Option (Right to Buy) 15.33 2022-08-11 4 M 0 12522 0 D 2025-11-14 Common Stock 12522 0 D Incentive Stock Option (Right to Buy) 23.64 2023-11-02 Common Stock 4865 4865 D Non-Qualified Stock Option (Right to Buy) 23.64 2023-11-02 Common Stock 15169 15169 D Phantom Stock Common Stock 17196.473 17196.473 D These shares were sold in multiple transactions at prices ranging from $24.07 to $24.45, inclusive. The reporting person undertakes to provide to ADTRAN Holdings, Inc. (the Issuer), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (1) to this Form 4. These shares were sold in multiple transactions at prices ranging from $24.07 to $24.38, inclusive. The reporting person undertakes to provide to ADTRAN Holdings, Inc. (the Issuer), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4. These shares were sold in multiple transactions at prices ranging from $24.15 to $24.41, inclusive. The reporting person undertakes to provide to ADTRAN Holdings, Inc. (the Issuer), any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (3) to this Form 4. The options granted to the reporting person vested in four equal annual installments beginning on the first anniversary of the date of the grant, which was November 15, 2014. The options granted to the reporting person vested in four equal annual installments beginning on the first anniversary of the date of the grant, which was November 14, 2015. The options granted to the reporting person vested in four equal annual installments beginning on the first anniversary of the date of the grant, which was November 2, 2013. 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, which phantom shares become payable in cash six months after the reporting person's separation of service with the Issuer. Explanatory note: This amendment is being filed to clarify that the sales prices for the direct sales on 8/11/22 that were originally reported in the Form 4 filed on 8/15/22 were weighted average prices and to provide the range of prices at which the at which the shares were sold. Michael Foliano, by power of attorney 2022-09-02