FREMONT, Calif. — Aehr Test Systems Inc. stock rocketed higher Thursday, climbing more than 8% to trade around $68 as investors bet on the semiconductor test equipment maker's surging order book tied to artificial intelligence infrastructure, even after the company posted mixed fiscal third-quarter results.

Aehr Test Systems
Aehr Test Systems

Shares of the NASDAQ-listed company (AEHR) rose as much as 10% intraday Thursday, building on a 26% surge the previous session following its earnings release. The stock has now skyrocketed more than 210% year-to-date in 2026, turning it into one of the hottest small-cap plays in the chip sector amid booming demand for AI processors and data center components.

Aehr, which specializes in wafer-level and package-level test and burn-in systems, reported fiscal third-quarter revenue of $10.3 million for the period ended Feb. 27, missing Wall Street expectations of about $10.8 million and plunging 44% from $18.3 million a year earlier. The company swung to a non-GAAP net loss of $1.5 million, or 5 cents per share, compared with a year-ago profit of 7 cents per share. However, the loss was narrower than the consensus forecast of a 7-cent loss.

The revenue shortfall stemmed largely from a shift in product mix and timing of shipments, but investors quickly zeroed in on far stronger forward-looking signals. Aehr booked a whopping $37.2 million in new orders during the quarter — delivering a book-to-bill ratio exceeding 3.5 times — pushing its effective backlog to a record $50.9 million when including post-quarter wins.

"We are seeing significant demand from AI and data center customers," Aehr President and CEO Gayn Erickson said in a statement accompanying the results. The company highlighted production orders for its FOX-XP wafer-level burn-in systems from a lead AI processor customer and follow-on wins in silicon photonics for hyperscale data center optical interconnects.

Analysts and market watchers described Aehr as a "quiet bottleneck" in the AI supply chain. Its equipment stresses semiconductors through burn-in testing to weed out early failures, ensuring reliability for high-power AI chips used in training and inference workloads at massive data centers. Only a fraction of advanced AI accelerators currently undergo full wafer-level burn-in, leaving substantial room for adoption growth as hyperscalers ramp production.

Recent orders underscore that momentum. In February, Aehr landed a $14 million order for FOX-XP systems from its lead AI processor customer. It also secured follow-on business for silicon photonics devices critical to high-speed optical connections in AI servers. Earlier in the year, the company won initial orders for its Sonoma ultra-high-power systems to burn-in next-generation AI ASICs for a major hyperscale customer.

"These wins position Aehr at the heart of AI infrastructure buildout," said one analyst who upgraded the stock following the earnings. Craig-Hallum upgraded Aehr to Buy from Hold, citing improving business momentum, while Lake Street raised its price target to $56 from $50.

Aehr also announced a $60 million at-the-market equity offering Thursday, giving it flexibility to fund growth or acquisitions as demand accelerates. The company completed the acquisition of Incal Technology last year to expand its footprint in AI semiconductor testing.

For the full fiscal year ending May 2026, Aehr reaffirmed guidance for revenue on the high end of $45 million to $50 million. It expects second-half revenue between $25 million and $30 million and reiterated a path to non-GAAP profitability in the fourth quarter.

The upbeat bookings outlook helped offset concerns about the current-quarter softness, which management attributed partly to lumpy shipment timing and a temporary emphasis on package-level burn-in products.

Aehr's technology addresses a critical pain point in semiconductor manufacturing. As chips for electric vehicles, AI, silicon carbide power devices and photonics become more complex and power-hungry, the need for rigorous testing and stabilization before deployment grows. Aehr's FOX family of systems can test and burn-in full wafers or singulated die in parallel, improving yields and reducing costs for customers.

The company's products serve diverse end markets, including AI processors, data center infrastructure, automotive, industrial and silicon photonics for optical I/O. Demand from hyperscale cloud providers building out AI training clusters has become a dominant driver.

Wall Street's view on Aehr remains mixed but tilting more positive. Consensus ratings hover around Hold with an average price target near $68, though some firms see higher upside if AI orders continue to materialize. The stock's rapid run has left it trading at elevated valuations, with a market capitalization now exceeding $2 billion.

Investors appeared unfazed by the revenue miss, focusing instead on the massive backlog and potential for a strong second half. Broader market sentiment also helped, with a ceasefire agreement between the U.S., Israel and Iran easing some geopolitical tensions and lifting risk assets.

Aehr executives expressed confidence in a rebound. Management highlighted expectations for a "near-term follow-on production order" from its lead hyperscale customer and said bookings for the second half should land on the high side of prior $60 million to $80 million guidance.

Shares closed Wednesday at $63.16, up sharply on the earnings reaction and macro tailwinds. By mid-afternoon Thursday, they traded near $68.19, extending gains.

The surge reflects growing recognition that Aehr's niche expertise in reliability testing could prove essential as the AI boom demands ever-more robust semiconductors. Hyperscalers and chip designers cannot afford failures in massive AI clusters, making burn-in a non-negotiable step.

Still, risks remain. Aehr derives a significant portion of revenue from a handful of large customers, exposing it to order timing volatility. The company has yet to achieve consistent profitability, and competition in the test equipment space could intensify.

For now, momentum favors the bulls. With AI capital spending showing no signs of slowing and Aehr's backlog at record levels, the company appears poised for a potential inflection as shipments ramp in coming quarters.

Aehr Test Systems, founded in 1977 and headquartered in Fremont, employs about 136 people. It has installed thousands of systems worldwide and continues to innovate in wafer-level solutions that enable parallel testing of hundreds or thousands of devices simultaneously.

As the semiconductor industry grapples with exploding complexity driven by AI, companies like Aehr that provide critical enabling technology are drawing fresh attention from growth-oriented investors.

Whether the stock can sustain its blistering pace will depend on execution in the back half of the year and the ability to convert that hefty backlog into revenue and, ultimately, profits.