New York, June 20, 2026, 12:30 EDT
- Teradyne finished Thursday at $437.92, up 7.19%. U.S. markets were closed Friday for Juneteenth.
- Shares added 8.6% for the holiday-shortened week. The stock is set to join the Nasdaq-100 before the open on Monday.
- AI-fueled test demand is still the key bull story here, but after the run, there’s less cushion for a miss.
Teradyne is coming into this week with new index momentum and pressure to deliver. The stock jumped 7.19% to $437.92 on Thursday, its last U.S. close before the Juneteenth holiday.
Teradyne is set to join the Nasdaq-100 before the opening bell on Monday, June 22, Nasdaq said. Astera Labs, CoreWeave, Nebius and Rocket Lab will also join. The move could mean index funds built to mirror the Nasdaq-100 have to shift their holdings to stay in line with the new list.
With U.S. markets shut Friday for Juneteenth, Nasdaq trading picks back up Monday at 9:30 a.m. Eastern. That puts Thursday’s finish as the last full look at Teradyne ahead of the index reshuffle.
Teradyne gained 8.6% for the week from its June 12 close at $403.20, according to historical closes. The stock jumped 7.24% Monday, dropped 5.33% Tuesday and drifted a bit lower Wednesday. On Thursday, shares surged again on volume near 18 million.
Stronger markets lent support. The Nasdaq Composite jumped 1.9% Thursday, putting it up 2.4% for the week as buyers moved back into AI and data-infrastructure plays. Investors.com Teradyne saw added demand, trading on its own catalyst ahead of a benchmark shift.
Teradyne isn’t just about cyclical chip equipment anymore. In April, the company posted first-quarter revenue of $1.282 billion, up 87% from a year ago, with Semiconductor Test accounting for $1.111 billion. CEO Greg Smith pointed to “the strength of our wafer to AI data center strategy” as the quarter’s driver. Guidance for the second quarter is $1.15 billion to $1.25 billion. Teradyne, Inc.
The bet in the market is simple: more AI chips means more advanced packaging and more testing. Teradyne on June 8 said it has rolled out a test-cell solution with Tokyo Electron aimed at AI and data-center chips. Shannon Poulin, who heads Teradyne’s Semiconductor Test Group, said customers want “dependable screening at every stage of advanced packaging.” Teradyne, Inc.
The read-through across competitors is mixed, but still backing the action. Cohu climbed 6.0% in the last U.S. session. Japan’s Advantest traded near its 52-week high on June 19, standing out as a larger semiconductor-test peer. This looks like a sector trade, not only about Teradyne. But the Nasdaq-100 move is just for Teradyne.
But the setup cuts both ways. Teradyne trades at about 81 times trailing earnings and is near a 52-week high, market data show. If index buying turns out lighter than some expect, or if investors decide the AI test story is already in the shares, the stock could give up some of this week’s gains fast.
The coming week looks straightforward, but there’s not much margin for error. Monday marks the first session with the stock in the Nasdaq-100. That will show if passive flows and AI-driven hype keep drawing in buyers after the recent rally, or if the focus starts moving from buying the story to looking at the results.
