X0306 4 2022-08-09 0 0000926282 ADTRAN Holdings, Inc. ADTN 0001300513 Foliano Michael 901 EXPLORER BLVD HUNTSVILLE AL 35806 0 1 0 0 SVP of Finance & CFO Common Stock 2022-08-09 4 M 0 4516 16.97 A 154757.366 D Common Stock 2022-08-09 4 F 0 3212 23.86 D 151545.366 D Common Stock 2022-08-09 4 M 0 5644 15.33 A 157189.366 D Common Stock 2022-08-09 4 F 0 3627 23.86 D 153562.366 D Common Stock 2022-08-09 4 M 0 5271 18.97 A 158833.366 D Common Stock 2022-08-09 4 F 0 4191 23.86 D 154642.366 D Common Stock 2022-08-09 4 M 0 13546 16.97 A 168188.366 D Common Stock 2022-08-09 4 F 0 10783 23.86 D 157405.366 D Common Stock 247.958 I 401(k) Plan Incentive Stock Option (Right to Buy) 16.97 2022-08-09 4 M 0 4516 0 D 2022-11-03 Common Stock 4516 0 D Incentive Stock Option (Right to Buy) 15.33 2022-08-09 4 M 0 5644 0 D 2025-11-14 Common Stock 5644 0 D Incentive Stock Option (Right to Buy) 18.97 2022-08-09 4 M 0 5271 0 D 2024-11-14 Common Stock 5271 0 D Non-Qualified Stock Option (Right to Buy) 16.97 2022-08-09 4 M 0 13546 0 D 2022-11-03 Common Stock 13546 0 D Phantom Stock Common Stock 21112.16 21112.16 D Represents shares surrendered to Adtran Holdings, Inc. to cover the exercise price of outstanding stock options. The reporting person received 1,304 shares of common stock on the net exercise of stock options to purchase 4,516 shares of common stock. The reporting person surrendered 3,212 shares of common stock underlying the stock options for payment of the exercise price, using the closing stock price on August 8, 2022 of $23.86, pursuant to the terms of the 2006 Employee Stock Incentive Plan. Represents shares surrendered to Adtran Holdings, Inc. to cover the exercise price of outstanding stock options. The reporting person received 2,017 shares of common stock on the net exercise of stock options to purchase 5,644 shares of common stock. The reporting person surrendered 3,627 shares of common stock underlying the stock options for payment of the exercise price, using the closing stock price on August 8, 2022 of $23.86, pursuant to the terms of the 2015 Employee Stock Incentive Plan. Represents shares surrendered to Adtran Holdings, Inc. to cover the exercise price of outstanding stock options. The reporting person received 1,080 shares of common stock on the net exercise of stock options to purchase 5,271 shares of common stock. The reporting person surrendered 4,191 shares of common stock underlying the stock options for payment of the exercise price, using the closing stock price on August 8, 2022 of $23.86, pursuant to the terms of the 2006 Employee Stock Incentive Plan. Represents shares surrendered to Adtran Holdings, Inc. to cover the exercise price of outstanding stock options. The reporting person received 2,763 shares of common stock on the net exercise of stock options to purchase 13,546 shares of common stock. The reporting person surrendered 10,783 shares of common stock underlying the stock options for payment of the exercise price and tax withholdings, using the closing stock price on August 8, 2022 of $23.86, pursuant to the terms of the 2006 Employee Stock Incentive Plan. The options granted to the reporting person vested in four annual installments beginning on the anniversary of the date of grant and were fully vested prior to the Effective Time. 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. Michael Foliano 2022-08-11