RBBN

SEC source: 0001708055-26-000034 · form4.xml · derivative · entry 11

Marmurek Eric S · CIK 0001720721 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 25,651 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

F3 · balance_after: 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.

SEC source: 0001708055-26-000034 · form4.xml · nonDerivative · entry 4

Marmurek Eric S · CIK 0001720721 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 494,677

F2 · price: Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of the awards.

SEC source: 0001708055-26-000034 · form4.xml · nonDerivative · entry 3

Marmurek Eric S · CIK 0001720721 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 504,769

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

SEC source: 0001708055-26-000034 · form4.xml · nonDerivative · entry 2

Marmurek Eric S · CIK 0001720721 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 479,118

F2 · price: Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting of the awards.

SEC source: 0001708055-26-000034 · form4.xml · nonDerivative · entry 1

Marmurek Eric S · CIK 0001720721 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 498,135

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Share Unit (RSU) and Performance Share Unit (PSU) converts into common stock on a one-for-one basis.

SEC source: 0001708055-26-000021 · form4.xml · nonDerivative · entry 1

SHANI SHAUL · CIK 0000939974 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 183,466

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001708055-26-000024 · form4.xml · derivative · entry 3

Townsend John Raymond · CIK 0002043232 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,923

Underlying: Common Stock · 25,641 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: These RSUs convert to Common Stock on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on October 15, 2024; the remaining RSUs vest in three equal semi-annual installments through October 15, 2027.

F3 · derivative.expiration_date: The RSUs were granted on October 15, 2024; the remaining RSUs vest in three equal semi-annual installments through October 15, 2027.

SEC source: 0001708055-26-000024 · form4.xml · nonDerivative · entry 2

Townsend John Raymond · CIK 0002043232 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,309

F2 · price: Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-26-000024 · form4.xml · nonDerivative · entry 1

Townsend John Raymond · CIK 0002043232 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 103,398

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: These RSUs convert to Common Stock on a one-for-one basis.

SEC source: 0001708055-26-000023 · form4.xml · nonDerivative · entry 1

GRAYSON BRUNS H · CIK 0001204899 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 783,347

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors and committees thereof.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001708055-26-000022 · form4.xml · derivative · entry 3

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,500

Underlying: Common Stock · 37,500 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

F3 · derivative.exercise_date: The RSUs were issued on October 15, 2024. The remaining RSUs vest on October 15, 2026.

F3 · derivative.expiration_date: The RSUs were issued on October 15, 2024. The remaining RSUs vest on October 15, 2026.

SEC source: 0001708055-26-000022 · form4.xml · nonDerivative · entry 2

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 449,807

F2 · price: Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-26-000022 · form4.xml · nonDerivative · entry 1

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 464,563

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

SEC source: 0001708055-26-000006 · form4.xml · nonDerivative · entry 3

McClelland Bruce William · CIK 0001424201 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,516,164

SEC source: 0001708055-26-000006 · form4.xml · nonDerivative · entry 2

McClelland Bruce William · CIK 0001424201 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,503,664

SEC source: 0001708055-26-000006 · form4.xml · nonDerivative · entry 1

McClelland Bruce William · CIK 0001424201 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,491,164

SEC source: 0001708055-26-000004 · form4.xml · nonDerivative · entry 1

SHANI SHAUL · CIK 0000939974 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 170,495

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001708055-26-000003 · form4.xml · nonDerivative · entry 1

GRAYSON BRUNS H · CIK 0001204899 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 767,428

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors and committees thereof.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001708055-25-000041 · form4.xml · derivative · entry 1

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,721

Underlying: Common Stock · 169,721 shares

Expires not disclosed

F1 · derivative.exercise_price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

F2 · derivative.exercise_date: The RSUs were issued on December 12, 2025 and will vest as to 50% on December 15, 2026, with the remaining 50% of the RSUs vesting on December 15, 2027.

F2 · derivative.expiration_date: The RSUs were issued on December 12, 2025 and will vest as to 50% on December 15, 2026, with the remaining 50% of the RSUs vesting on December 15, 2027.

SEC source: 0001708055-25-000039 · form4.xml · derivative · entry 4

McCaffery Stephen J. · CIK 0001690129 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,202

Underlying: Common Stock · 43,202 shares

Expires not disclosed

F1 · derivative.exercise_price: Each RSU and PSU converts into common stock on a one-for-one basis.

F5 · derivative.exercise_date: The PSUs were awarded on October 31, 2025. 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 period beginning on the grant date and ending December 31, 2028. The aggregate number of shares issued may range from zero shares to 200% of the target number of shares reported in column 3 of Table II. The number of PSUs reported in column 3 of Table II reflects achievement at the target level of performance. The PSUs will vest on May 15, 2029.

F5 · derivative.expiration_date: The PSUs were awarded on October 31, 2025. 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 period beginning on the grant date and ending December 31, 2028. The aggregate number of shares issued may range from zero shares to 200% of the target number of shares reported in column 3 of Table II. The number of PSUs reported in column 3 of Table II reflects achievement at the target level of performance. The PSUs will vest on May 15, 2029.

SEC source: 0001708055-25-000039 · form4.xml · derivative · entry 3

McCaffery Stephen J. · CIK 0001690129 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,804

Underlying: Common Stock · 64,804 shares

Expires not disclosed

F1 · derivative.exercise_price: Each RSU and PSU converts into common stock on a one-for-one basis.

F4 · derivative.exercise_date: The PSUs were awarded on October 31, 2025. 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 three fiscal years ending December 31, 2025, 2026 and 2027. The aggregate number of shares issued may range from zero shares to 150% of the target number of shares reported in column 3 of Table II. The number of PSUs reported in column 3 of Table II reflects achievement at the target level of performance. The PSUs will vest on May 15, 2028.

F4 · derivative.expiration_date: The PSUs were awarded on October 31, 2025. 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 three fiscal years ending December 31, 2025, 2026 and 2027. The aggregate number of shares issued may range from zero shares to 150% of the target number of shares reported in column 3 of Table II. The number of PSUs reported in column 3 of Table II reflects achievement at the target level of performance. The PSUs will vest on May 15, 2028.

SEC source: 0001708055-25-000039 · form4.xml · derivative · entry 2

McCaffery Stephen J. · CIK 0001690129 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 108,006

Underlying: Common Stock · 108,006 shares

Expires not disclosed

F1 · derivative.exercise_price: Each RSU and PSU converts into common stock on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were awarded on October 31, 2025 and vest as to 36,002 shares on the first anniversary of the date of grant, with the remaining RSUs vesting in four equal semi-annual installments thereafter through October 31, 2028.

F3 · derivative.expiration_date: The RSUs were awarded on October 31, 2025 and vest as to 36,002 shares on the first anniversary of the date of grant, with the remaining RSUs vesting in four equal semi-annual installments thereafter through October 31, 2028.

SEC source: 0001708055-25-000039 · form4.xml · derivative · entry 1

McCaffery Stephen J. · CIK 0001690129 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 432,027

Underlying: Common Stock · 432,027 shares

Expires not disclosed

F1 · derivative.exercise_price: Each RSU and PSU converts into common stock on a one-for-one basis.

F2 · derivative.exercise_date: The RSUs were awarded on October 31, 2025 and vest as to 108,007 shares on the first anniversary of the date of grant, with the remaining RSUs vesting in six equal semi-annual installments thereafter through October 31, 2029.

F2 · derivative.expiration_date: The RSUs were awarded on October 31, 2025 and vest as to 108,007 shares on the first anniversary of the date of grant, with the remaining RSUs vesting in six equal semi-annual installments thereafter through October 31, 2029.

SEC source: 0001708055-25-000031 · form4.xml · derivative · entry 3

Macken Patrick W · CIK 0001641965 · EVP, CLO & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,652

Underlying: Common Stock · 20,652 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

F3 · derivative.exercise_date: The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.

F3 · derivative.expiration_date: The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.

SEC source: 0001708055-25-000031 · form4.xml · nonDerivative · entry 2

Macken Patrick W · CIK 0001641965 · EVP, CLO & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 343,546

F2 · price: Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-25-000031 · form4.xml · nonDerivative · entry 1

Macken Patrick W · CIK 0001641965 · EVP, CLO & Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 352,798

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

SEC source: 0001708055-25-000028 · form4.xml · derivative · entry 3

McClelland Bruce William · CIK 0001424201 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,420

Underlying: Common Stock · 34,421 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) converts into common stock on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.

F3 · derivative.expiration_date: The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.

SEC source: 0001708055-25-000028 · form4.xml · nonDerivative · entry 2

McClelland Bruce William · CIK 0001424201 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,479,164

F2 · price: Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-25-000028 · form4.xml · nonDerivative · entry 1

McClelland Bruce William · CIK 0001424201 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,492,708

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each Restricted Stock Unit (RSU) converts into common stock on a one-for-one basis.

SEC source: 0001708055-25-000032 · form4.xml · derivative · entry 3

Bucci Sam · CIK 0001824854 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,815

Underlying: Common Stock · 25,816 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

F3 · derivative.exercise_date: The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.

F3 · derivative.expiration_date: The RSUs were granted on April 17, 2023 and vested as to one-third on April 17, 2024; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through April 17, 2026.

SEC source: 0001708055-25-000032 · form4.xml · nonDerivative · entry 2

Bucci Sam · CIK 0001824854 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 448,811

F2 · price: Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-25-000032 · form4.xml · nonDerivative · entry 1

Bucci Sam · CIK 0001824854 · EVP & COO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 462,630

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

SEC source: 0001708055-25-000024 · form4.xml · derivative · entry 2

SHANI SHAUL · CIK 0000939974 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 185,210

Underlying: Common Stock · 185,210 shares

Expires not disclosed

F3 · derivative.exercise_price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

F4 · derivative.exercise_date: The RSUs will vest on October 15, 2026, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2026 Annual Meeting of Stockholders (the "2026 Annual Meeting") occurs prior to October 15, 2026, and, at such 2026 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 2026 Annual Meeting.

F4 · derivative.expiration_date: The RSUs will vest on October 15, 2026, subject to the Reporting Person's continued service with the Issuer through such date; provided, however, that if the Issuer's 2026 Annual Meeting of Stockholders (the "2026 Annual Meeting") occurs prior to October 15, 2026, and, at such 2026 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 2026 Annual Meeting.

SEC source: 0001708055-25-000024 · form4.xml · nonDerivative · entry 1

SHANI SHAUL · CIK 0000939974 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 160,947

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001708055-25-000019 · form4.xml · derivative · entry 3

Townsend John Raymond · CIK 0002043232 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,564

Underlying: Common Stock · 128,205 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: These RSUs convert to Common Stock on a one-for-one basis.

F3 · derivative.exercise_date: The RSUs were granted on October 15, 2024 and vested as to one-third on October 15, 2025; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through October 15, 2027.

F3 · derivative.expiration_date: The RSUs were granted on October 15, 2024 and vested as to one-third on October 15, 2025; the remaining two-thirds of the RSUs vest in four equal semi-annual installments thereafter through October 15, 2027.

SEC source: 0001708055-25-000019 · form4.xml · nonDerivative · entry 2

Townsend John Raymond · CIK 0002043232 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 77,757

F2 · price: Reflects shares of Common Stock withheld by the Issuer to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-25-000019 · form4.xml · nonDerivative · entry 1

Townsend John Raymond · CIK 0002043232 · EVP, Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,205

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: These RSUs convert to Common Stock on a one-for-one basis.

SEC source: 0001708055-25-000025 · form4.xml · nonDerivative · entry 1

GRAYSON BRUNS H · CIK 0001204899 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 755,710

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors and committees thereof.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001708055-25-000027 · form4.xml · derivative · entry 3

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Stock · 75,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

F3 · derivative.exercise_date: The RSUs were issued on October 15, 2024 and vested as to 50% on October 15, 2025. The remaining 50% of the RSUs vest in two equal semi-annual installments thereafter through October 15, 2026.

F3 · derivative.expiration_date: The RSUs were issued on October 15, 2024 and vested as to 50% on October 15, 2025. The remaining 50% of the RSUs vest in two equal semi-annual installments thereafter through October 15, 2026.

SEC source: 0001708055-25-000027 · form4.xml · nonDerivative · entry 2

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 427,063

F2 · price: Reflects shares of common stock withheld by the Registrant to satisfy tax withholding obligations in connection with the vesting.

SEC source: 0001708055-25-000027 · form4.xml · nonDerivative · entry 1

Marmurek Eric S · CIK 0001720721 · SVP, Deputy CFO and CAO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 456,575

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Eash RSU represents a contingent right to receive one share of the Registrant's common stock.

SEC source: 0001062993-25-015408 · form4.xml · nonDerivative · entry 3

Redington Dan · CIK 0001967463 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

SEC source: 0001062993-25-015409 · form4.xml · nonDerivative · entry 1

INFANTE BEATRIZ V · CIK 0001193369 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 343,224

SEC source: 0001062993-25-015408 · form4.xml · nonDerivative · entry 2

Redington Dan · CIK 0001967463 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,176

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.965 to $4.160, inclusive. The reporting person undertakes to provide to Ribbon Communications, any security holder of Ribbon Communications, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price with the ranges set forth in this footnote.

SEC source: 0001062993-25-015408 · form4.xml · nonDerivative · entry 1

Redington Dan · CIK 0001967463 · EVP, Global Sales

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,610

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.16 to $4.165, inclusive. The reporting person undertakes to provide to Ribbon Communications, any security holder of Ribbon Communications, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price with the ranges set forth in this footnote.

SEC source: 0001062993-25-012961 · form4.xml · nonDerivative · entry 1

GRAYSON BRUNS H · CIK 0001204899 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 746,829

F1 · kind: Represents shares issued in lieu of receipt of cash fees for service on the Registrant's Board of Directors and committees thereof.

F2 · price: Price determined in accordance with Registrant's Non-Employee Director Compensation Policy.

SEC source: 0001062993-25-011901 · form4.xml · derivative · entry 3

SHANI SHAUL · CIK 0000939974 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 48,365 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: The RSUs were awarded on June 17, 2024 and vested in full on June 17, 2025.

F3 · derivative.expiration_date: The RSUs were awarded on June 17, 2024 and vested in full on June 17, 2025.

SEC source: 0001062993-25-011901 · form4.xml · nonDerivative · entry 1

SHANI SHAUL · CIK 0000939974 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 153,711

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each RSU represents a contingent right to receive one share of the Issuer's common stock.

SEC source: 0001062993-25-011898 · form4.xml · derivative · entry 3

Mair Scott · CIK 0001945175 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 48,365 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Issuer's common stock.

F3 · derivative.exercise_date: The RSUs were awarded on June 17, 2024 and vested in full on June 17, 2025.

F3 · derivative.expiration_date: The RSUs were awarded on June 17, 2024 and vested in full on June 17, 2025.

SEC source: 0001062993-25-011898 · form4.xml · nonDerivative · entry 1

Mair Scott · CIK 0001945175 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 140,638

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Each RSU represents a contingent right to receive one share of the Issuer's common stock.