Why Aehr Test Systems Stock Soared This Week

Shares in semiconductor test equipment company Aehr Test Systems (NASDAQ: AEHR) rose by 12.5% in the week to Friday. It's been a good week for semiconductor stocks in general, and a good week for Aehr's probable new customers as well.

You can usually get a good sense of where a small company is headed by examining its customers' spending plans, and that's certainly the case with Aehr. Unfortunately, it's a lot harder to read the tea leaves this year. Traditionally, its largest customer is ON Semiconductor, to which Aehr sells silicon carbide wafer-level burn-in (SiC WLBI) solutions.

For reference, SiC WLBI sales accounted for 90% of Aehr's business in 2024. Still, as disclosed on the recent fiscal third quarter 2025 earnings call, "this year it's tracking to less than 40%, with artificial intelligence (AI) processors burn-in representing over 35%."

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Source Fool.com