What ACM Research, Inc. told the SEC could break it.

ACM Research is overwhelmingly concentrated in mainland China on both the demand and supply sides. Substantially all of its semiconductor-manufacturing equipment sales have been to customers located in mainland China, and it expects a substantial majority of revenue to keep coming from that region; it also conducts a substantial majority of its product development, manufacturing, support and services in China through ACM Shanghai (with additional operations in Korea). This double-sided China concentration means a downturn in China WFE spending (which Gartner estimates is declining), a Chinese policy shift, or U.S.-China tension hitting Chinese chipmakers would have an outsized effect on revenue, while its own operations sit inside the jurisdiction most exposed to U.S. export controls. An extreme single-country concentration.

“To date, substantially all of our sales of equipment for semiconductor-manufacturing have been to customers located in mainland China, and we anticipate that a substantial majority of our revenue from these products will continue to come from customers located in this region for the foreseeable future.”

ACM Research sits at the center of U.S.–China technology restrictions. On December 2, 2024, BIS added its principal operating subsidiaries — ACM Shanghai (China) and ACM Korea — to the BIS Entity List, which prohibits any party worldwide from furnishing U.S.-export-controlled hardware, software, or technology to those entities without authorization, directly threatening its access to critical U.S.-origin components, tools, and technology. On top of this, China faces stacked U.S. tariffs (currently ~145%; semiconductors are exempt for now but the Commerce Department opened a Section 232 national-security investigation into semiconductor-equipment imports on April 1, 2025), and ACM faces HFCAA delisting risk because its auditor is based in mainland China where the PCAOB's inspection access is contested. A severe, multi-vector U.S. regulatory exposure that can sever its supply of U.S.-controlled inputs and impair its U.S. listing.

“Among the 140 companies added to the BIS Entity List were two subsidiaries of ACM Research, ACM Shanghai, located in the People's Republic of China, and ACM Korea, a direct subsidiary of ACM Shanghai, which is located in the Republic of Korea, and other related entities.”

ACM Research depends on a limited number of suppliers — including single-source suppliers — for critical components and subassemblies used in its semiconductor wet-process tools, and certain components/subassemblies have only ever been purchased from its current suppliers, so changing source would risk disruption. This sole-source exposure is amplified by the BIS Entity List restrictions, which can cut off U.S.-export-controlled components/technology, and by China-tariff and trade-policy volatility; a shortage, qualification problem, or geopolitical cut-off at a single-source vendor could delay tool deliveries, trigger order cancellations, and compress margins. ACM has responded in part by taking equity stakes in component suppliers (Shengyi, Wooil — captured as edges) to secure supply. Suppliers are otherwise unnamed, so this registers as a sole-source/limited-supplier risk.

“We depend on a limited number of suppliers, including single source suppliers, for critical components and subassemblies, and our business could be disrupted if they are unable to meet our needs.”