X0508 4 2024-05-15 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 Restricted Stock Units (RSUs) 2024-05-15 4 A 0 237341 0 A Common Stock 237341 237341 D Performance-Based RSUs (PSUs) 2024-05-15 4 A 0 327532 0 A Common Stock 327532 327532 D PSUs 2024-05-15 4 A 0 218354 0 A Common Stock 218354 218354 D The RSUs convert to common stock on a one-for-one basis. The RSUs vest in full on May 16, 2025. Each PSU represents a contingent right to receive one share of the Issuer's Common Stock. The number of PSUs earned and issuable upon vesting will be determined based on goals (set by the Compensation Committee on an annual basis) for each of the two fiscal years prior to the vesting date. The aggregate number of shares issued may range from zero shares to 150% 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. This PSU will vest on 05/15/2026. 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 a peer index of companies (set by the Compensation Committee at the time of grant) over the three fiscal years ending prior to the vesting date. The aggregate number of shares issued may range from zero 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. This PSU will vest on 05/15/2027. Patrick Macken, By POA from Bruce McClelland, CEO & President 2024-05-17