Aehr Test Systems (AEHR) Q1 2027 earnings review
Aehr Test Systems triples sales, but two customers dominate orders
Aehr Test Systems, which makes machines that stress-test computer chips under heat and voltage, turned its spring order boom into record shipments while burning cash to build inventory. First-quarter revenue tripled to $33 million, and higher factory volume lifted gross margin excluding one-offs to 49%. Chief executive Gayn Erickson raised the full-year sales outlook to $150 million, and by our math first-quarter sales plus the $109 million effective backlog already cover 95% of that target.
| Revenue | $33.0M +201% from a year ago (+75% from Q4) |
|---|---|
| Effective order backlog (Nov 1) | $109.3M up from $100.6M in July |
| Profit per share, excluding one-offs | $0.28 $0.01 a year ago |
| Full-year revenue outlook | Raised to $150M from $130โ150M (3x FY26 sales) |
โ๏ธ Verdict: ๐ข Bullish
The story got better because top-tier artificial intelligence chip trials converted into paid orders and factory volume overcame lower-margin package-level systems. A major processor supplier ordered a wafer-level test cell for its Taiwan manufacturing partner, and the lead data-center customer qualified its second chip on Sonoma and placed initial orders. One caution: despite Erickson highlighting a dozen potential buyers, one $22 million follow-on order still supplied nearly half of the quarter's $47 million in bookings, and inventory and unpaid bills drained $11 million in cash since May.
The question now is whether this artificial intelligence test buildout broadens across multiple chipmakers or stays concentrated in two buyers like the earlier silicon carbide cycle. If the Taiwan installation wins high-volume orders and new data-center customers sign on, backlog will hold up after the current Sonoma batch ships; if not, orders will dip once the two lead buyers digest their equipment. Second-quarter bookings and the customer concentration table in the upcoming quarterly filing will tell.
๐ Bull Case
Backlog and Q1 Sales Cover 95% of the Plan
Aehr Test Systems makes equipment that stress-tests semiconductors under heat and voltage to catch early failures, a process called burn-in. After three slow quarters in fiscal 2026, customer orders jumped in the spring, and this quarter proved the company can turn that backlog into delivered systems.
- First-quarter revenue: $33.0 million, triple the $11.0 million a year ago and up 75% from last quarter
- Bookings (new orders received): $46.7 million, or 1.4 times quarterly sales, up from $11.4 million a year ago
- Order backlog: $100.9 million at quarter-end, rising to $109.3 million by November 1 with post-quarter orders
Management raised its full-year revenue outlook to $150 million from a prior $130โ150 million range because of "increasing visibility into existing customer production programs, and anticipated production and delivery schedules". By our math, first-quarter revenue plus the November 1 backlog equals $142.3 million, leaving less than $8 million of new orders needed over the next three quarters to hit the target.
What to watch: second-quarter bookings and backlog conversion. Because the bulk of the spring package-level orders are scheduled to ship in the second quarter, backlog will naturally draw down unless new production orders replace them.
AI Chip Trials Convert Into Paid System Orders
Aehr sells two main product lines for artificial intelligence chips: FOX-XP, which tests dozens of chips at once on an uncut silicon wafer (wafer-level burn-in), and Sonoma, which tests finished, high-power chips one package at a time (package-level burn-in). Both lines advanced from engineering tests to paid orders this quarter.
In wafer-level systems, a major processor supplier that finished a trial last quarter "decided to purchase a fully configured FOX-XP WLBI test cell for installation at one of its key Outsourced Semiconductor Assembly and Test (OSAT) partners in Taiwan", chief executive Gayn Erickson said. Erickson called the buyer "one of the largest potential burn-in system opportunities Aehr has ever pursued", while the existing lead wafer-level customer added a $22 million order in August.
In package-level systems, Aehr is "shipping and installing more than a dozen systems per month" for its lead data-center customer's first AI chip, Erickson said. That customer's second chip "successfully completed qualification on Sonoma, and we have received follow-on orders to support initial production sampling", with the customer projecting higher eventual volumes than on its first chip.
What to watch: high-volume production decisions at the Taiwan test partner in mid-calendar 2027, several months after the early-2027 installation. A production order there would give Aehr a second major wafer-level AI customer.
Higher Factory Volume Lifted Gross Margin to 48.5%
Shipping more than a dozen Sonoma package-level systems a month was a concern for profitability, because Sonoma machines carry lower margins than wafer-level systems and use power supplies that recently rose 40% in cost. Instead, tripling factory revenue spread fixed manufacturing overhead across far more units.
- Gross margin excluding one-offs: 48.5%, up 11.0 percentage points from a year ago and 3.8 points from last quarter
- Cost of making the products (excluding one-offs): 51.5% of revenue, down from 62.5% a year ago
- Overhead and sales costs (GAAP): 16.6% of revenue vs 43.0% a year ago; research and development fell to 12.6% from 26.0%
That cost spread pushed net profit excluding one-offs to $9.4 million, or 28.3% of sales, already well above the company's full-year target of at least 20%. What to watch: second-quarter gross margin when the remaining bulk of the lower-margin Sonoma backlog ships, which will test whether factory volume can keep offsetting product mix.
๐ป Bear Case
Two Lead Customers Still Drive the Order Book
"Historically, we had only a handful of customers with the potential to generate significant production orders. Today, we see that potential across more than a dozen customers," Erickson said. The chip-testing company wants investors to see a broad customer base across AI, optical chips, and power semiconductors rather than a repeat of its single-customer silicon carbide boom and bust.
The quarter's numbers show that potential has not yet changed who pays the bills. The $22 million August order from the lead wafer-level AI customer alone accounted for 47% of the quarter's $46.7 million in bookings, by our math. The other named production orders came from the single lead data-center customer for Sonoma, while the new processor supplier bought one test cell for evaluation.
In addition, the press release did not disclose the revenue share from AI and silicon photonics or from WaferPak contactors (custom consumable probe cards), figures management highlighted last quarter. Relying on two active buyers means a single schedule delay can swing quarterly sales.
What to watch: customer concentration percentages in the upcoming quarterly Form 10-Q filing. A rise in the top two customers' share of revenue above last year's 40.5% combined share would confirm that concentration is increasing during the ramp.
Inventory and Unpaid Bills Drained $11.5 Million
Aehr reported $7.2 million in GAAP net profit this quarter, but its operations consumed $3.1 million in cash after burning $3.8 million during the one-month June transition period. Together with $4.5 million spent buying back employee shares to cover tax withholdings, total cash fell by $11.5 million since May 29 to $105.1 million.
Building systems ahead of delivery tied up the money. Inventories rose 28.5% from May 29 to $53.1 million, and accounts receivable (uncollected customer bills) jumped 52.4% to $26.6 million. Because Aehr raised $97.4 million in stock offerings last year, its balance sheet can easily fund the build, but profit is not yet turning into cash.
What to watch: operating cash flow and inventory levels in the second quarter. As the large Sonoma order batch ships and first-quarter bills are collected, working capital should release cash back onto the balance sheet.
Risks this quarter didn't answer
Three standing concerns from prior quarters received no new details in the first-quarter earnings release.
- Flash and high-bandwidth memory testing: omitted from the release after finishing a benchmark in fiscal 2025; a paid development contract is needed to prove memory will contribute.
- China patent litigation against Semight: no update on the Supreme People's Court appeal; the quarterly Form 10-Q legal footnote will show its status.
- Warranty costs on new systems: warranty expense doubled last year as new machines ramped; the Form 10-Q warranty table will show if defect accruals stayed elevated.
๐ Other Themes
Calendar Shift Created an Idle Transition Month
Aehr moved its fiscal year-end from May to June, creating a one-month transition period in June 2026 before the first quarter began. That standalone month generated just $0.6 million in revenue and a $2.7 million GAAP net loss, while absorbing $7.3 million in bookings by our math. The shift also aligns fiscal 2027 quarters one month later than the fiscal 2026 comparison periods.
๐ฒ Other KPIs
Up 53.7% from $5.2 million at the end of May and nearly เฆธเฆพเฆคfold from $1.2 million a year ago. Deferred revenue is cash deposits and upfront payments customers make before Aehr delivers systems or services, so its climb alongside backlog confirms customers are funding their orders.
Diluted shares rose 12.0% from 29.9 million a year ago and 1.1% from last quarter. The increase stems from last year's public stock offerings that raised $97.4 million, partially offset this quarter when the California equipment maker spent $4.5 million retiring shares for employee tax withholdings.
๐ฎ Guidance
Raised. Management lifted its full-year target to the top of the prior range, calling for sales to triple from $50.0 million in fiscal 2026. By our math, that leaves $117.0 million for the remaining three quarters, or 200% growth over the same quarters last year, almost matching the first quarter's 201% pace.
Raised. The outlook now sets a floor of at least 20% after taxes (at least $30.0 million at the revenue plan), compared with last quarter's 18โ22% pre-tax target. After a 28.3% margin in the first quarter, the 20% floor implies at least 17.6% for the rest of the year by our math, leaving room for lower-margin Sonoma shipments.
โ Key Questions
What is the product mix of revenue and backlog?
Last quarter management disclosed that AI and silicon photonics exceeded 80% of revenue and WaferPak consumables were 31%. Those figures were absent from the first-quarter release, leaving investors unable to separate high-margin consumable sales from lower-margin Sonoma machines.
How much of the $109.3M backlog sits with two customers?
The $22 million August wafer-level order made up nearly half of first-quarter bookings, and the lead data-center buyer drives Sonoma. Knowing the top two customers' share of the $109.3 million effective backlog would show whether the dozen-customer pipeline is reducing concentration.
Why did June transition revenue drop to $0.6 million?
The four-week transition period between fiscal 2026 and fiscal 2027 recorded just $0.64 million in sales while Aehr was shipping over a dozen Sonoma systems per month. Management should clarify whether shipments were held for the new fiscal year or awaited customer acceptance.
Where do flash and HBM memory evaluations stand?
Memory chip testing was absent from the release after management previously pointed to fiscal 2027 orders following its flash memory benchmark. Investors need to know whether a paid development agreement is still active or if memory customers have paused wafer-level plans.