Ribbon Communications Inc. — Director's Dealing 2021

May 5, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Ribbon Communications Inc. (RBBN)
CIK: 0001708055
Period of Report: 2021-05-03

Reporting Person: LOPEZ MIGUEL A (EVP and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-03	Common Stock	P	900	$6.5778	Acquired	23400	Direct
2021-05-04	Common Stock	P	100	$6.43	Acquired	23500	Direct

Footnotes

F1: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $6.55 to $6.64, inclusive. The reporting person undertakes to provide to Ribbon,
any security holder of Ribbon, 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.