X0508 4 2024-04-17 0001708055 Ribbon Communications Inc. RBBN 0001424201 McClelland Bruce William C/O RIBBON COMMUNICATIONS 6500 CHASE OAKS BLVD. PLANO TX 75023 1 1 0 0 President & CEO 0 Common Stock 2024-04-17 4 M 0 68844 A 1230807 D Common Stock 2024-04-17 4 M 0 120817 A 1351624 D Common Stock 2024-04-17 4 F 0 69746 2.61 D 1281878 D Restricted Stock Units (RSUs) 2024-04-17 4 M 0 68844 0 D Common Stock 68844 137682 D Performance Share Units (PSUs) 2024-04-17 4 M 0 120817 0 D Common Stock 120817 0 D Each Restricted Stock Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis. Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting. The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through April 17, 2026. The PSUs were issued on April 17, 2023. The number of PSUs earned and vested was based on achievement of a revenue goal set (prior to grant) by the Compensation Committee of the Issuer's Board of Directors for the fiscal year ended December 31, 2023. The remaining PSUs were forfeited. Patrick Macken, By POA from Bruce McClelland, CEO & President 2024-04-19