Market Share
~50% process control
Key Product
Wafer inspection and metrology systems
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KLA Corporation dominates the process control segment of semiconductor manufacturing — the inspection and metrology tools that detect defects and measure critical dimensions at every stage of chip production. With approximately 50% market share in wafer inspection and metrology, KLA's tools are a mandatory part of any advanced fab's quality control. Without KLA's defect detection systems, fabs cannot achieve the yield rates necessary for profitable production. The company's dominance makes it a chokepoint: any fab building leading-edge chips at 7nm or below is dependent on KLA equipment, and export restrictions limit its ability to supply advanced process control tools to China.
Connected companies
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Critical path — raw silicon to deployment
The tightest single-source dependencies, in order.
Export controls touching KLA
U.S.–Netherlands–Japan Trilateral Chip Equipment Alignment (Jan 2023)
Following extensive diplomatic negotiations, the United States, the Netherlands, and Japan reached an informal multilateral agreement — announced on or around January 27, 2023 — to align their semiconductor equipment export control frameworks. The Netherlands subsequently imposed DUV licensing requirements on ASML (effective September 2023), and Japan expanded its controls to 23 categories of advanced fab equipment (effective July 2023). The trilateral alignment effectively closed the most significant loopholes in restricting China's access to the equipment needed for leading-edge chip production, since restrictions by any single ally could previously be circumvented through the others.
▲ 12 companies affected
U.S. Entity List: SMIC (Dec 2020)
The U.S. Department of Commerce added SMIC — China's largest foundry — to the Entity List on December 18, 2020, citing the risk that equipment and materials supplied to SMIC could be diverted to military end uses. The listing subjects exports of advanced semiconductor manufacturing tools destined for SMIC to a presumption-of-denial license review for items that could enable production at 10nm or below. Existing licenses for mature-node tooling were largely allowed to continue, keeping SMIC operational at 14nm/28nm nodes while freezing its path to sub-10nm leading-edge production.
▲ 9 companies affected
U.S. Entity List: YMTC (Dec 2022)
The U.S. Department of Commerce added YMTC — China's largest 3D NAND flash maker — to the Entity List on December 15, 2022. The action was motivated by concerns that YMTC had supplied NAND chips to Huawei in violation of U.S. restrictions, and by the broader goal of preventing YMTC from acquiring U.S.-origin equipment and technology needed to scale its 232-layer Xtacking NAND to volume production. Apple's plan to qualify YMTC chips as an iPhone supplier was halted following the listing.
▲ 6 companies affected
QWho supplies KLA?
KLA relies on 1 upstream supplier across the AI chip supply chain.
Rare Earths (CN) (Dominant refined rare-earth supplier (Nd, Dy for precision equipment magnets)).
QWhat does KLA make?
Dominant maker of wafer inspection and metrology tools
Key products Wafer inspection and metrology systems