ASML Holding N.V. (ASML): Who It Depends On
ASML designs and assembles the most complex machine tools in the world — EUV and DUV lithography scanners — but builds almost none of the core subsystems itself, sourcing the vast majority of each machine's hundreds of thousands of parts from a global supplier network, a handful of which are genuinely irreplaceable, chief among them optics partner Carl Zeiss SMT. On the other side, ASML sells each multi-hundred-million-dollar EUV system to a tiny list of leading-edge chipmakers, making its customer concentration as real and literal as it gets in large-cap tech — no reframing needed here, unlike diversified-consumer stocks elsewhere on this site.
Supply-chain dependency
Companies ASML relies on to design, manufacture, package, and assemble its hardware.
The sole supplier of ASML's projection optics and EUV multilayer mirrors, built to atomic-scale precision; ASML holds a near-25% stake in Zeiss SMT precisely because no alternative optics maker can produce systems at this tolerance. A private company, wholly owned by the Carl Zeiss Foundation, with no public ticker.
Supplies the high-power drive lasers that vaporize tin droplets into EUV light inside ASML's scanners, with no economical substitute at the required power and precision level. A private, family-owned company with no public ticker.
Builds the ultra-precision wafer and reticle stages and mechatronic modules that let ASML's scanners hold sub-nanometer overlay accuracy, a deeply integrated Dutch partner with no drop-in replacement. A private, family-owned company with no public ticker.
Provides critical gas-control, RF power, and vacuum-subsystem components used across ASML's DUV and EUV platforms, an area with few vendors capable of meeting semiconductor-grade tolerances.
Supplies laser and photonics components integrated into ASML's lithography and metrology systems, a specialty with limited alternate sourcing at the required tolerances.
Builds custom electronic and power modules to ASML's exact specifications, embedding deep IP that would be costly and slow to re-source elsewhere. A private company with no public ticker.
Supplies the high-end vacuum pump systems required to maintain the near-total-vacuum environment ASML's EUV light and mirrors need to function. Majority-owned by Germany's Busch Group with only a thin residual float on a German exchange, and no proper US-listed ticker.
Supplies wiring harnesses and electrical power-control units built directly into ASML system modules. Taken private in 2023, with no public ticker.
Supplies purified optical glass and crystal blanks used in DUV lens elements, a niche materials-science capability concentrated in very few hands globally. A private company, owned by the Carl Zeiss Foundation, with no public ticker.
Customer concentration
Companies that make up an outsized share of ASML's revenue - who ASML relies on to buy from it.
The world's dominant leading-edge foundry and ASML's single largest, most consistently reported EUV and High-NA customer; TSMC's capex plans routinely move ASML's own stock.
Buys EUV systems for both its foundry and memory businesses, and has been an active buyer of ASML's newest High-NA tools. Trades primarily in Seoul, with no proper US-listed ticker.
A founding-era ASML customer and former equity co-investor; Intel's Arizona fab was the first to install a commercial High-NA EUV tool, underscoring its outsized strategic weight in ASML's roadmap.
Not a single company — China has been one of ASML's largest single-country revenue sources in recent years, driven by mature-node DUV purchases from multiple domestic fabs ahead of tightening export controls. No individual Chinese foundry has a proper US-listed ticker.
A major memory and HBM customer whose AI-driven DRAM expansion has made it an increasingly important EUV and DUV buyer. Trades primarily in Seoul, with no proper US-listed ticker.
The largest US-based memory maker and a recurring large buyer of ASML's DUV and EUV systems for DRAM and NAND capacity expansion.
The percentages shown are editorial estimates based on public research (company disclosures, earnings commentary, and industry reporting) meant to illustrate relative reliance, not precise or audited figures. Companies without a proper, reliably tradable ticker on this site are shown without stock/earnings links. This is not financial advice.