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Ribbon Communications Inc. — DEFA14A Filings

4 DEFA14A filings on record

This page lists all DEFA14A filings submitted to the SEC by Ribbon Communications Inc. (RBBN), sorted by most recent first. Each row links to the full filing on EdgarLookup. Ribbon Communications Inc. has filed 4 DEFA14A documents with the SEC since 2017. To view all SEC filings by Ribbon Communications Inc., see the full filings list.

Overview All Filings Financials Insiders
All 10-K 10-K/A 10-Q 144 3 4 4/A 424B3 8-K 8-K/A 8-K12B ARS CORRESP D DEF 14A DEFA14A DEFM14A EFFECT NT 10-K NT 10-Q PRE 14A PREM14A S-3 S-3/A S-4 S-4/A S-8 SC 13D SC 13D/A SC 13G SC 13G/A SCHEDULE 13G/A SD UPLOAD
Form Description Accession Number Filed Period
DEFA14A DEFA14A 0001104659-22-044207 Apr 8, 2022 —
DEFA14A DEFA14A 0001104659-21-048713 Apr 9, 2021 —
DEFA14A FORM 8-K 0001104659-19-065920 Nov 20, 2019 —
DEFA14A 8-K 0001104659-19-064369 Nov 14, 2019 —