Ribbon Communications Inc. announced that on May 23, 2023, Mariano de Beer, a member of the Company's Board of Directors, determined that he does not intend to stand for re-election as a director of the Company when his term expires at the Annual Meeting in order to focus on his work as a partner with Nexo Latam, LLP. Mr. de Beer will remain a member of the Board and of the committees of the Board on which he currently serves through the Annual Meeting. Joining Ribbon as a director and Chairman of the Board's Technology & Innovation Committee following the Company's acquisition of ECI Telecom in March 2020, Mr. de Beer provided significant experience and support for the Company's integration of the IP Optical Networking business.

The Board expects to set the size of the Board of Directors at eight members, effective as of the Annual Meeting, so that there will not be a vacancy on the Board as a result of Mr. de Beer's decision.