X0306 4 2019-03-15 0001708055 Ribbon Communications Inc. RBBN 0001720719 McCready John R C/O RIBBON COMMUNICATIONS INC. 4 TECHNOLOGY PARK DRIVE WESTFORD MA 01886 0 1 0 0 EVP and Chief Strategy Officer Common Stock 2019-03-15 4 A 0 10564 0 A 96688 D Common Stock 2019-03-15 4 F 0 4690 5.22 D 91998 D Performance-Based Restricted Stock Units (PSUs) 2019-03-15 4 A 0 15326 0 A 2021-12-31 Common Stock 15326 15236 D These shares of Common Stock were issued to Reporting Person pursuant to a voluntary election by Reporting Person in lieu of cash for a portion of the Reporting Person's 2018 annual bonus pursuant to the Issuer's Senior Management Cash Incentive Plan and such shares shall vest immediately upon grant. PAYMENT OF TAX LIABILITY BY DELIVERING SECURITIES TO THE COMPANY INCIDENT TO THE VESTING OF A SECURITY. Each PSU represents a contingent right to receive one share of the Issuer's Common Stock, based on the Issuer's total shareholder return (TSR) compared to pre-established relative TSR goals, based on the TSR of the Russell 2500 Telecommunications Sub Sector Index, that were set by the Compensation Committee (the Compensation Committee) of the Issuer's Board of Directors. The aggregate number of shares issued may range from zero (0) shares to 200% of the target number of shares reported in columns 5, 7 and 9 of Table II. The number of PSUs reported in columns 5, 7 and 9 of Table II reflects achievement at the target level of performance. Between zero (0) and 200% of one-third of the PSUs will vest, if at all, as determined by the Compensation Committee after the TSR performance period, commencing on January 1, 2019 and ending on December 31, 2021. John R. McCready 2019-03-19