RBBN

Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors.

Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors and committees thereof.

Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs were awarded on June 16, 2025 and vested in full on June 16, 2026.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The RSUs vest as to one-third on June 15, 2027; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through June 15, 2029.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be 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 ending prior to the vesting date. The aggregate number of shares issued may range from zero shares to 125% 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. These PSUs will vest on April 15, 2029.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be 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 ending prior to the vesting date. The aggregate number of shares issued may range from zero shares to 125% 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. These PSUs will vest on April 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be 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 ending prior to the vesting date. The aggregate number of shares issued may range from zero shares to 125% 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. These PSUs will vest on April 15, 2029.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be determined based on goals (set by the Compensation Committee of the Board of Directors (the "Compensation Committee") on an annual basis) for each of the three fiscal years prior to the vesting date. The aggregate number of shares issued may range from zero shares to 100% 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. These PSUs will vest on April 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The RSUs vest as to one-third on June 15, 2027; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through June 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be determined based on goals (set by the Compensation Committee of the Board of Directors (the "Compensation Committee") on an annual basis) for each of the three fiscal years prior to the vesting date. The aggregate number of shares issued may range from zero shares to 100% 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. These PSUs will vest on April 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The RSUs vest as to one-third on June 15, 2027; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through June 15, 2029.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be determined based on goals (set by the Compensation Committee of the Board of Directors (the "Compensation Committee") on an annual basis) for each of the three fiscal years prior to the vesting date. The aggregate number of shares issued may range from zero shares to 100% 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. These PSUs will vest on April 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The RSUs vest as to one-third on June 15, 2027; the remaining two-thirds of the RSUs will vest in four equal semi-annual installments thereafter through June 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be determined based on goals (set by the Compensation Committee of the Board of Directors (the "Compensation Committee") on an annual basis) for each of the three fiscal years prior to the vesting date. The aggregate number of shares issued may range from zero shares to 100% 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. These PSUs will vest on April 15, 2029.

The RSUs and PSUs convert to Common Stock on a one-for-one basis.

The number of PSUs earned and issuable upon vesting will be 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 ending prior to the vesting date. The aggregate number of shares issued may range from zero shares to 125% 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. These PSUs will vest on April 15, 2029.

Each RSU represents a contingent right to receive one share of the Issuer's common stock.

The RSUs will vest on June 15, 2027, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2027 Annual Meeting of Stockholders (the "2027 Annual Meeting") occurs prior to June 15, 2027, and, at such 2027 Annual Meeting, the Reporting Person either chooses not to stand for re-election to the Issuer's Board of Directors or, after standing for re-election, is not re-elected, then these RSUs will vest as of the date of the 2027 Annual Meeting.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of the awards.

Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of the awards.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

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.