X0306 4 2018-04-02 0001708055 Ribbon Communications Inc. RBBN 0001615890 Riley Kevin W. C/O RIBBON COMMUNICATIONS INC. 4 TECHNOLOGY PARK DRIVE WESTFORD MA 01886 0 1 0 0 CTO & EVP Growth R&D Common Stock 2018-04-02 4 M 0 13542 0 A 202538 D Common Stock 2018-04-02 4 M 0 8125 0 A 210663 D Common Stock 2018-04-02 4 F 0 27688 5.10 D 182975 D Performance-Based Restricted Stock Units (PSUs) 0 2018-04-02 4 M 0 13542 0 A Common Stock 13542 5208 D Performance-Based Restricted Stock Units (PSUs) 0 2018-04-02 4 M 0 8125 0 A Common Stock 8125 0 D Represents the vesting (at 130% of target) of Performance-Based Restricted Stock Units (PSUs) granted on March 31, 2017 for the 2017 performance period. As a result of the achievement of 130%, which was above target, the Company increased the number of shares granted to the individual by 3,125 shares, or the above-target amount, to account for such achievement.Performance for this award during the award's 2017 performance period was measured based on the Issuer's total shareholder return (TSR) compared to pre-established relative TSR goals, based on the TSR of the NASDAQ Telecommunications Index, that were set by the Compensation Committee of the Issuer's Board of Directors. The remaining PSUs will vest on March 31, 2019 and accordingly have no expiration date. Represents the vesting (at 130% of target) of Performance-Based Restricted Stock Units (PSUs) granted April 1, 2016 for the 2017 performance period. As a result of the achievement of 130%, which was above target, the Company increased the number of shares granted to the individual by 1,875 shares, or the above-target amount, to account for such achievement.Performance for this award during the award's 2017 performance period was measured based on the Issuer's total shareholder return (TSR) compared to pre-established relative TSR goals, based on the TSR of the NASDAQ Telecommunications Index, that were set by the Compensation Committee of the Issuer's Board of Directors. The PSUs have fully vested and accordingly have no expiration date PAYMENT OF TAX LIABILITY BY DELIVERING SECURITIES TO THE COMPANY INCIDENT TO THE VESTING OF A SECURITY. Kevin W. Riley 2018-04-04