---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-22-005984"
form_type: "8-K"
ticker: "RBBN"
cik: "0001708055"
company_name: "Ribbon Communications Inc."
filed_at: "2022-01-20T23:59:59+00:00"
generated_at: "2026-06-27T16:51:42.137453+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Ribbon reports preliminary Q4 2021 revenue $231M, below guidance on supply chain issues

## Summary
- Revenue $231M, gross margin 50%, non-GAAP gross margin 54%, operating loss $4M, adjusted EBITDA $26M.
- Supply chain issues cut sales ~$10M, causing shortfall vs guidance; costs expected through H1 2022.
- IP Optical Networks segment sales $83M (+20% QoQ); Cloud & Edge $147M with deals pushed to 2022.
- Higher component and logistics costs reduced margins ~220 bps; customer/deal mix added ~200 bps.
- Cash $106M; book-to-bill 1.13; CEO notes new carrier wins in US, Japan, Africa.

## SEC filing metadata
- accession: 0001104659-22-005984
- form_type: 8-K
- ticker: RBBN
- cik: 0001708055
- company_name: Ribbon Communications Inc.
- filed_at: 2022-01-20T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1708055/000110465922005984/0001104659-22-005984-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1708055/000110465922005984/tm224005d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-22-005984
- JSON: https://secwatch.observer/filing/0001104659-22-005984.json
- Plain text: https://secwatch.observer/filing/0001104659-22-005984.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.