144 0001193369 XXXXXXXX LIVE 0001708055 RIBBON COMMUNICATIONS INC. 001-38267 6500 Chase Oaks Blvd., Suite 100, Plano TX 75023 (978) 614-8100 BEATRIZ INFANTE Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

8692 34605.46 177081847 09/05/2025 NASDAQ Common 02/15/2013 Restricted Stock Issuer N 1563 02/15/2013 Not Applicable Common 07/01/2014 Restricted Stock Issuer N 285 07/01/2014 Not Applicable Common 05/23/2012 Restricted Stock Issuer N 1000 05/23/2012 Not Applicable Common 06/17/2013 Restricted Stock Issuer N 1288 06/17/2013 Not Applicable Common 06/12/2013 Restricted Stock Issuer N 3556 06/12/2013 Not Applicable Common 06/02/2011 Restricted Stock Issuer N 1000 06/02/2011 Not Applicable Y 09/05/2025 /s/ Beatriz V. Infante