Shares of Ribbon Communications closed down 10.5% following the Q1 2026 report, as investors reacted to margin compression and near-term earnings weakness. Lower-than-expected U.S. service provider sales and a 300-basis-point shortfall in gross margin weighed on sentiment, despite management’s reiterated optimism for a stronger second half.

• Revenue finished near the midpoint of guidance, but was offset by materially lower sales to U.S. Tier 1 service providers; IP Optical Networks sales declined 14% year-over-year, and Cloud & Edge down 8%.
• Consolidated gross margin was approximately 300 basis points below expectations, primarily due to reduced professional services revenue and elevated service expenses; adjusted EBITDA was negative $8 million, missing prior guidance.
• Customer momentum in India provided a partial offset (Bardi Airtel was a 10%+ customer), but U.S. weakness persisted, with Cloud & Edge sales to service providers in the U.S. down 5% year-over-year.
• New wins in high-growth areas such as data center interconnect and secure optical networks were highlighted, and IP Optical bookings were strong at 1.5x book-to-bill, supporting an improved outlook for later in the year.
• Management is retaining key resources to prepare for anticipated second-half demand, but this is creating further near-term margin pressure and impacting profitability in the current quarter.