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Teradyne builds the machines that test computer chips and electronics to make sure they work before they're sold.
Teradyne makes the quality-control machinery of the electronics world. When a chip factory finishes etching millions of microscopic circuits onto a silicon wafer, someone has to check that every chip actually works before it gets packaged and shipped. Teradyne builds the automated test machines that do this checking at industrial speed, touching tiny electrical probes to each chip and running it through its paces in a fraction of a second. Its customers are the big semiconductor manufacturers and assembly houses, and they pay for speed, accuracy, and machines that don't break down, because a stalled test line can idle a billion-dollar factory.
The company has two main pieces. The bigger one is semiconductor testing, where its machines sort good chips from bad ones at the end of the manufacturing line. The second is a robotics business, Universal Robots, which makes collaborative robot arms — the kind designed to work safely right next to a human on a factory floor, rather than behind a cage. Those arms do simple tasks like picking, placing, and screwing, sold mostly to small and midsize manufacturers who could never afford a traditional industrial robot. Teradyne also sells test gear for other electronics and defense systems, but chips and robots are the heart of it. The chip-testing business is a wonderfully strange kind of business. Teradyne doesn't make chips and doesn't design them; it sells the referee that decides which ones are worthy. That puts it in a cozy spot: as chips get more complex, testing gets harder and more valuable, so the test machine makers get a raise without having to bet on which chip designer wins. The catch is that chipmakers are a cyclical, moody bunch. When demand booms they buy testers in bulk; when it slumps they pause, and Teradyne's sales swing hard with them.
Robots were supposed to smooth out that rollercoaster. Teradyne bought Universal Robots in 2015 for $285 million, betting that cheap, easy-to-use robot arms would spread everywhere the way computers did. It was a genuinely exciting bet, and for a while it looked brilliant. But the robot business has struggled more recently, with weak demand from small manufacturers and tougher competition, and Teradyne took a large write-down on that bet. Meanwhile, the AI boom has been very good to the chip-test side, since AI chips are big, complex, and need serious testing. Teradyne also returns cash to shareholders through dividends and buybacks, which is what you do when your core business throws off more money than it can sensibly reinvest.
Saved answer · last researched 21 Oct 2026