X0306 4 2022-06-21 0001708055 Ribbon Communications Inc. RBBN 0001641965 Macken Patrick W 6500 CHASE OAKS BOULEVARD SUITE 100 PLANO TX 75023 0 1 0 0 EVP, Chief Legal Officer Common Stock 2022-06-21 4 M 0 25000 A 76126 D Common Stock 2022-06-21 4 F 0 10205 2.77 D 65921 D Restricted Stock Units (RSU) 2022-06-21 4 M 0 25000 0 D Common Stock 25000 50000 D RSUs convert into common stock on a one-for-one basis. Reflects share of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of RSUs. The RSUs vested as to one-third on June 19, 2021, and the remaining two-thirds of the RSUs vest in four equal, semi-annual installments thereafter through June 19, 2023. Patrick Macken 2022-06-21