Aehr Test Systems slips 15.2% as KLA grows 11.7%

Aehr Test Systems and KLA both sell equipment into the semiconductor supply chain, but the article frames them at opposite ends of scale and risk. Aehr's focus is narrow: stress-testing equipment for power semiconductors, particularly silicon carbide used in electric vehicles, and high-bandwidth memory for AI infrastructure. KLA's process-control tools, by contrast, are used across the entire chip-making industry, and alongside equipment sales it runs a services business that accounts for roughly 23% of total revenue.

The fiscal 2026 numbers reflect that difference. Aehr's revenue fell 15.2% to $50.0 million, producing a net loss of $7.1 million and a negative $5.4 million in free cash flow. Its five largest customers made up nearly 70% of net sales, a level of concentration the article says adds risk. KLA grew revenue 11.7% to $13.6 billion and earned $4.8 billion, a 35.6% net margin, though it also carries a concentration risk, with Taiwan Semiconductor Manufacturing Company generating more than 10% of total revenues. Aehr's balance sheet shows no debt relative to equity and a 10.3x current ratio, which may give it room to absorb the downturn.

The stakes appear to hinge on time horizon. Aehr's growth story depends on whether silicon carbide and high-bandwidth memory demand eventually rewards its specialized tools, while its current losses and cash burn raise the question of how long that wait can last. KLA's steadier, more diversified business looks less exposed to a single end market, but its size may mean slower relative growth. The trade-off for investors is between a concentrated, high-beta equipment maker with a cash cushion and a profitable industry titan with a smaller concentration risk of its own.