Ribbon Communications Inc. — Director's Dealing 2025

Oct 17, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Ribbon Communications Inc. (RBBN)
CIK: 0001708055
Period of Report: 2025-10-17

Reporting Person: Bucci Sam (EVP & COO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-10-17	Common Stock	M	25816	—	Acquired	462630	Direct
2025-10-17	Common Stock	F	13819	$3.81	Disposed	448811	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-10-17	Restricted Stock Units (RSUs)	$	M	25816	Disposed		Common Stock (25816)	Direct

Footnotes

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

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

F3: 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.