Shares of Teradyne declined 9.6% following earnings, as investors reacted negatively to management’s cautious outlook and signals of increasing revenue concentration risk, despite record Q1 results. The company’s forward commentary highlighted the potential for lumpy demand and short-term volatility, raising concerns about the sustainability of its growth trajectory.

• Q1 revenue reached a record $1.3 billion, up 18% from the prior peak in Q2 2021, with non-GAAP EPS of $2.56.
• AI-related demand drove nearly 70% of revenue, up from about 60% in Q4 2025, but management emphasized growing dependence on a small group of large customers.
• The business is increasingly concentrated, which management acknowledged raises near-term risk of demand peaks and valleys tied to customer-specific factors.
• Mobile market weakness and memory supply/availability were noted as headwinds, particularly outside the iOS segment.
• Robotics posted a fourth straight quarter of sequential growth, offsetting some segment volatility, but guidance commentary underscored uncertainty in future top-line stability.