Ribbon Communications Inc.

RBBN·NASDAQ·$2.83Share Price as of 11/2·$498MMarket Cap as of 11/2

Financials

10-QQ3 ended 09/30/2610/28/26 10-QQ2 ended 06/30/2607/31/26 10-QQ1 ended 03/31/2605/06/26 10-KFY 202502/26/26 10-QQ3 ended 09/30/2510/23/25

Disclosures

8-KCurrent report10/27/26 8-KCurrent report07/28/26 8-KCurrent report06/17/26 8-KCurrent report06/05/26 8-KCurrent report04/28/26

Prospectuses and Registrations

S-8Registration of securities for employees12/10/25 S-8Registration of securities for employees07/02/25 S-8Registration of securities for employees10/28/24 S-3/AShelf registration (amended)05/17/23 S-3Shelf registration04/04/23

Proxies

DEF 14ADefinitive proxy04/17/26 DEF 14ADefinitive proxy04/14/25 PRE 14APreliminary proxy04/02/25 DEF 14ADefinitive proxy04/12/24 DEF 14ADefinitive proxy06/20/23

Ownership

Form 4Insider transaction10/19/26 Form 4Insider transaction10/19/26 Form 4Insider transaction10/19/26 Form 4Insider transaction07/15/26 Form 4Insider transaction07/15/26

Other

SDConflict Minerals disclosure05/29/26 ARSAnnual report to shareholders04/17/26 SDConflict Minerals disclosure05/30/25 ARSAnnual report to shareholders04/14/25 SDConflict Minerals disclosure05/31/24