Lam Research Corporation (LRCX): Who It Depends On

Ichor designs and builds the gas delivery systems and fluid-handling modules at the heart of Lam's etch and deposition tools. Lam Research and Applied Materials together accounted for roughly 76% of Ichor's total revenue in fiscal 2025, making Ichor effectively an extension of Lam's own manufacturing line with few qualified alternatives able to replicate its precision welding and cleanroom assembly work.

UCT manufactures the precision subsystems, chassis, and gas and chemical delivery modules that Lam assembles into finished systems rather than building in-house. Applied Materials and Lam Research together made up more than half of UCT's revenue in recent fiscal years (54.5% in fiscal 2024), and requalifying outsourced, cleanroom-grade production at this scale elsewhere would be slow.

MKS supplies the RF power delivery systems, pressure and flow control subsystems, and plasma generation hardware that regulate conditions inside Lam's etch and deposition chambers. These subsystems are engineered into Lam's tool designs at a component level, making mid-design supplier substitution difficult even as MKS's own customer base has diversified beyond chip equipment makers.

Advanced Energy is a longtime supplier of RF and DC plasma power delivery systems used to strike and sustain the plasmas inside Lam's etch and deposition chambers. Precision power delivery is safety- and performance-critical to tool qualification, so equipment makers rarely swap this class of supplier once a chamber is qualified.

Lam's own SEC filings disclose that certain components and sub-assemblies -- specialty ceramics, electrostatic chucks, edge rings, and precision-machined chamber parts -- are obtainable only from a single supplier in some cases. These tend to be small, specialized machine shops and materials makers rather than large public companies. Not a single company.

The remainder of Lam's bill of materials and outsourced production is spread across a wide global base of contract manufacturers, logistics providers, and materials vendors, none individually large enough to be a named, concentrated single point of failure. Not a single company.

Samsung has been named one of Lam's two most significant customers in every fiscal year from 2023 through 2025, historically representing around 17-22% of Lam's annual revenue as a leading buyer of etch and deposition tools for both memory and foundry production. Samsung's primary listing is the Korea Exchange; its thinly traded US OTC ADR has no proper US-listed ticker.

TSMC has been named alongside Samsung as one of Lam's two most significant customers in every fiscal year from 2023 through 2025, buying etch and deposition systems to support its leading-edge logic and foundry capacity expansions.

SK hynix was named among Lam's most significant customers in Lam's FY2020-2022 filings and remains a major buyer of etch and deposition tools for its DRAM and HBM/NAND production. SK hynix trades primarily on the Korea Exchange, with no proper US-listed ticker.

Micron was named among Lam's most significant customers in prior fiscal-year filings and continues to be a large buyer of memory fabrication equipment as it expands US and international DRAM and NAND capacity.

Intel was named among Lam's most significant customers in earlier fiscal-year filings, buying etch and deposition tools for its logic fabs, though disclosed capital-spending pullbacks at Intel have reduced its relative weight in Lam's customer base in recent years.

Kioxia, Japan's leading NAND flash maker, was named among Lam's most significant customers in earlier fiscal-year filings and remains a key buyer of etch tools for 3D NAND production. Kioxia trades on the Tokyo Stock Exchange, with no proper US-listed ticker.

Chinese customers as a group made up roughly a third of Lam's annual revenue in fiscal 2025, and Yangtze Memory Technologies was named among Lam's most significant customers in earlier filings. This concentration is closely watched because it is exposed to US export control rules on advanced semiconductor equipment sales to China. Not a single company.

The remainder of Lam's revenue is spread across other foundry, logic, and memory manufacturers worldwide, none individually large enough to be named as a top customer in Lam's SEC filings. Not a single company.