---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-25-041242"
form_type: "8-K"
ticker: "RBBN"
cik: "0001708055"
company_name: "Ribbon Communications Inc."
filed_at: "2025-04-29T23:59:59+00:00"
generated_at: "2026-05-23T03:56:14.566707+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.7
calibrated_materiality_score: 0.7
confidence: "high"
source: SEC EDGAR
---

# Ribbon Communications Q1 revenue flat at $181M; GAAP op loss widens; backlog up 35%

## Summary
- Revenue $181M flat YoY; GAAP operating loss $20M vs $13M loss in Q1 2024.
- Non-GAAP Adj EBITDA $6M vs $12M YoY; diluted EPS ($0.15) vs ($0.18).
- Backlog up 35% YoY; management expects 5-8% YoY revenue growth for 1H25.
- Two Federal/Enterprise deals delayed to Q2 but already fulfilling; included in 2Q outlook.
- GAAP gross margin 45.4% (51.2% in Q1 2024); Non-GAAP 48.6% (55.1%).

## SEC filing metadata
- accession: 0001104659-25-041242
- form_type: 8-K
- ticker: RBBN
- cik: 0001708055
- company_name: Ribbon Communications Inc.
- filed_at: 2025-04-29T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.7
- calibrated_materiality_score: 0.7
- confidence: high
- sec_items: 2.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1708055/000110465925041242/0001104659-25-041242-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1708055/000110465925041242/tm2513435d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-25-041242
- JSON: https://secwatch.observer/filing/0001104659-25-041242.json
- Plain text: https://secwatch.observer/filing/0001104659-25-041242.txt

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