---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-26-050356"
form_type: "8-K"
ticker: "RBBN"
cik: "0001708055"
company_name: "Ribbon Communications Inc."
filed_at: "2026-04-28T23:59:59+00:00"
generated_at: "2026-05-15T02:53:20.588850+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# Ribbon Communications Q1 revenue $163M (-10% YoY), GAAP loss $34M; CFO Townsend resigns, Marmurek promoted

## Summary
- Revenue $163M (-10% YoY); GAAP net loss $34M ($0.20 EPS loss) vs $26M loss YoY.
- Non-GAAP adjusted EBITDA loss $8M vs positive $6M prior year; GAAP gross margin 42.9% vs 45.4%.
- CFO John Townsend resigns effective April 30 for other opportunity; Rick Marmurek promoted to CFO, CAO effective May 1.
- Management expects Q2 growth and strong H2; cites new Data Center Interconnect wins, AIOps traction, AWS collaboration.

## SEC filing metadata
- accession: 0001104659-26-050356
- form_type: 8-K
- ticker: RBBN
- cik: 0001708055
- company_name: Ribbon Communications Inc.
- filed_at: 2026-04-28T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 2.02, 5.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1708055/000110465926050356/0001104659-26-050356-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1708055/000110465926050356/tm2612891d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-26-050356
- JSON: https://secwatch.observer/filing/0001104659-26-050356.json
- Plain text: https://secwatch.observer/filing/0001104659-26-050356.txt

## Key facts
- Earnings Releases
  Ribbon Communications Inc. reported the first quarter of 2026 results: revenue $163 million, net income ($34) million, EPS $(0.20) per diluted share.
  - Period: the first quarter of 2026
  - Revenue: $163 million
  - Net income: ($34) million
  - EPS: $(0.20) per diluted share
  - Result: reported results
  source text: enterprises, and critical infrastructure operators in modernizing and safeguarding their networks and services. First Quarter 2026 Highlights Financial Results 1 : · Revenue was $163 million, compared to $181 million for the first quarter of 2025 · GAAP Operating Loss was ($32) million, compared to ($20) million for the first quarter of 2025 · Non-GAAP Adjusted
  evidence_url: https://www.sec.gov/Archives/edgar/data/1708055/000110465926050356/0001104659-26-050356-index.htm
- Executive change
  John Townsend departed as Executive Vice President, Chief Financial Officer at Ribbon Communications Inc..
  - Action: resigning
  - Role: Executive Vice President, Chief Financial Officer
  source text: announced that John Townsend, Executive Vice President, Chief Financial Officer of the Company, has notified the Company that he is resigning effective April 30, 2026 to pursue another professional opportunity.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1708055/000110465926050356/0001104659-26-050356-index.htm
- Executive change
  Eric “Rick” Marmurek was appointed as Executive Vice President, Chief Financial Officer and Chief Accounting Officer at Ribbon Communications Inc..
  - Action: promoted
  - Role: Executive Vice President, Chief Financial Officer and Chief Accounting Officer
  source text: the Company announced that it is promoting Eric “Rick” Marmurek to the position of Executive Vice President, Chief Financial Officer and Chief Accounting Officer of the Company effective May 1, 2026.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1708055/000110465926050356/0001104659-26-050356-index.htm

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