X0609 4 2026-04-17 0001708055 Ribbon Communications Inc. RBBN 0001824854 Bucci Sam false 6500 CHASE OAKS BLVD. SUITE 100 PLANO TX 75023 0 1 0 0 EVP, Chief Operating Officer 0 Common Stock 2026-04-17 4 M 0 25815 A 474626 D Common Stock 2026-04-17 4 F 0 13818 2.71 D 460808 D Common Stock 2026-04-17 4 M 0 42753 A 503561 D Common Stock 2026-04-17 4 F 0 22884 2.71 D 480677 D Common Stock 2026-04-17 4 M 0 80546 A 561223 D Common Stock 2026-04-17 4 F 0 43116 2.71 D 518107 D Common Stock 2026-05-15 4 M 0 38578 A 556685 D Common Stock 2026-05-15 4 F 0 20650 2.63 D 536035 D Common Stock 2026-05-15 4 M 0 52743 A 588778 D Common Stock 2026-05-15 4 F 0 28233 2.63 D 560545 D Common Stock 2026-05-15 4 M 0 83335 A 643880 D Common Stock 2026-05-15 4 F 0 44609 2.63 D 599271 D Restricted Share Units (RSUs) 2026-04-17 4 M 0 25815 0 D Common Stock 25815 0 D Performance Share Units (PSUs) 2026-04-17 4 M 0 42753 0 D Common Stock 42753 0 D PSUs 2026-04-17 4 M 0 80546 0 D Common Stock 80546 0 D PSUs 2026-05-15 4 M 0 38578 0 D Common Stock 38578 0 D RSUs 2026-05-15 4 M 0 52743 0 D Common Stock 52743 52742 D RSUs 2026-05-15 4 M 0 83335 0 D Common Stock 83335 166665 D Each Restricted Share 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 of the awards. The RSUs were granted on April 17, 2023 and are fully vested. The number of PSUs earned and issued upon vesting was determined based on goals (set by the Compensation Committee of the Issuer's Board of Directors (the "Compensation Committee") on an annual basis) for each of the three fiscal years ended December 31, 2025. Based on the Compensation Committee's determination of achievement of these pre-established financial goals, 32%, 70% and 36% of the shares subject to the 2023, 2024 and 2025 financial periods, respectively, were earned and vested on April 17, 2026. The number of PSUs earned and issued upon vesting was determined 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 ended December 31, 2025. Based on the Compensation Committee's determination of achievement of the pre-established TSR goal, 130% of the shares subject to the PSU award were earned and vested on April 17, 2026. The number of PSUs earned and issued upon vesting was determined based on goals (set by the Compensation Committee on an annual basis) for each of the two fiscal years ended December 31, 2025. Based on the Compensation Committee's determination of achievement of these pre-established financial goals, 70% and 36% of the shares subject to the 2024 and 2025 financial periods, respectively, were earned and vested on May 15, 2026. The RSUs were granted on May 15, 2025 and vested as to one-half on May 15, 2026; the remaining one-half of the RSUs will vest in two equal semi-annual installments thereafter through May 15, 2027. The RSUs were granted on May 15, 2025 and vested as to one-third on May 15, 2026; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through May 15, 2028. Patrick Macken, By POA from Sam Bucci, EVP, Chief Operating Offcer 2026-05-19