TERADYNE, INC Segments Disclosure

V. SEGMENT, GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION

As of December 31, 2024, Teradyne had two reportable segments (Semiconductor Test and Robotics) and four operating segments (Semiconductor Test, System Test, Wireless Test, and Robotics). Effective March 2025, Teradyne's Chief Operating Decision Maker (“CODM”) (Teradyne's Chief Executive Officer) placed Regan Mills as President, Product Test, which as of that date included Production Board Test, Defense/Aerospace, and Wireless Test. As noted in Note D: “Acquisitions” and based on the underlying business activities and established reporting structure, upon acquisition, PIC Testing was aggregated into Product Test. As a result, Teradyne has three reportable segments (Semiconductor Test, Robotics, and Product Test). As of December 31, 2025, each of Teradyne's reportable segments represents an individual operating segment. All prior period disclosures have been recast to conform to the current segment structure and presentation requirements.

The Semiconductor Test segment includes operations related to the design, manufacturing and marketing of semiconductor test products and services inclusive of storage and system level test products. The Robotics segment includes operations related to the design, manufacturing and marketing of collaborative robotic arms and autonomous mobile robots. The Product Test segment includes operations related to the design, manufacturing and marketing of products and services for defense/aerospace test, circuit-board test, wireless test systems, and silicon photonics testing. Each reportable segment has a segment manager who is accountable to and maintains regular contact with Teradyne’s CODM to discuss operating activities, financial results, forecasts, and plans for the segment.

The CODM uses business segment income (loss) before income taxes predominantly in the annual budgeting and forecasting process. The CODM also uses this measure when making decisions about the allocation of operating and capital resources to each segment. The accounting policies of the business segments are the same as those described in Note B: “Accounting Policies.”

Teradyne typically has a specifying customer such as an OEM, IDM, or Fabless company, who chooses platforms and drives demand, and a purchasing customer who actually places the order and receives the equipment. In different cases, the specifying and purchasing customers have more influence in the purchase decision. In 2025, we had two customers who specified greater than 10% of our consolidated revenues and one additional customer who directly purchased more than 10% of our consolidated revenues. The two specifying customers were both customers of our Semiconductor Test and Product Test segments and drove 12% and 10% of consolidated revenues. The additional direct customer, a customer of our Semiconductor Test segment, accounted for 19% of consolidated revenues including certain revenues specified by other customers. In 2024, we estimate one customer of the Semiconductor Test and Wireless Test segments, specified approximately 13% of consolidated revenues. In 2023, one customer of our Semiconductor Test segment accounted for approximately 10% of consolidated revenues.