AEHR · CIK 0001040470
What Aehr Test Systems told the SEC could break it.
Concentration runs through nearly everything Aehr disclosed: its five largest customers made up about 77% of fiscal 2025 net revenue, with two single customers alone at roughly 39% and 15%, and about 70% of its sales were for delivery outside the U.S., largely across Asia and Europe. That overseas tilt feeds directly into its other flags — U.S.–China trade tensions, tariffs and technology-transfer restrictions that could bar sales to Chinese customers or raise component costs — while on the supply side it depends on single or limited-source suppliers for key parts of its test systems, from environmental chambers and power supplies to wafer contactors and certain ICs.
4 self-disclosed vulnerabilities, pulled from its own filings, each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Customer concentration
- five largest customers = 77% of revenue; two customers 39% & 15% in FY2025high
Aehr's revenue is highly concentrated — its five largest customers were ~77% of net revenue in fiscal 2025, with two (unnamed) customers alone at ~39% and ~15%; loss of a major customer would materially harm results.
“Revenues from the Company's five largest customers accounted for approximately 77%, 93%, and 97% of its net revenues in fiscal 2025, 2024, and 2023, respectively. During fiscal 2025, two customers accounted for approximately 39% and 15% of the Company's net revenues.”
SEC filing →As of 2025
Geographic concentration
- ~70% of net sales delivered outside the U.S. (Asia/Europe)medium
Approximately 70% of Aehr's fiscal 2025 net sales were for delivery outside the U.S. (largely Asia and Europe), concentrating revenue in foreign markets subject to FX, geopolitical and demand risks, with sales/service resources spread across Taiwan, Germany, Japan, South Korea, the Philippines and China.
“Approximately 70%, 95%, and 86% of our net sales in fiscal 2025, 2024, and 2023, respectively, were attributable to sales to customers for delivery outside of the United States.”
SEC filing →As of 2025
Regulatory & policy
- U.S.-China trade tensions, tariffs and technology-transfer restrictionsmedium
Deteriorating U.S.-China (and China-Taiwan) relations create tariff, trade-barrier and technology-transfer-restriction risks that could bar Aehr from selling to Chinese customers and raise component costs, while it also purchases materials from suppliers worldwide.
“These barriers include increased tariffs and other trade barriers, regulatory restrictions, or limitations on technology transfer. These tariffs, and the related geopolitical uncertainty between the United States and China, may cause decreased demand for our products or increase cost of components used in our products, which could have a material adverse effect on our business, results of operations and financial condition.”
SEC filing →As of 2025
Supplier concentration
- single/limited-source suppliers for chambers, power supplies, interconnects, contactors and ICsmedium
Aehr's FOX systems, WaferPak Contactors and DiePak Carriers contain components — environmental chambers, power supplies, high-density interconnects, wafer/module contactors, substrates and certain ICs — supplied by only one or a limited number of suppliers and subcontractors, risking delivery, capacity and quality disruptions.
“power supplies, high-density interconnects, wafer contactors, module contactors, signal distribution substrates, and certain ICs that are currently supplied by only one or a limited number of suppliers.”
SEC filing →As of 2025
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