ASML is the Dutch company that designs and builds the lithography machines used to manufacture chips, and it is the only supplier of the most advanced type, extreme ultraviolet (EUV) lithography. In its own words, ASML “provide[s] chipmakers with everything they need - hardware, software and services - to mass produce patterns on silicon through lithography,” and it “design[s] and manufacture[s] the lithography machines that are an essential component in chip manufacturing.” ASML does not make chips itself; it makes the equipment that chipmakers such as TSMC use inside their fabs.
Lithography is the step that prints circuit patterns onto silicon wafers using light. ASML describes EUV as a technology “unique to ASML” that “prints microchips using light with a wavelength of just 13.5 nm.” The very short wavelength is what allows the smallest, most densely packed features on leading-edge chips. ASML notes that during the long development of EUV, “only ASML - with our partners and suppliers - continued work toward a viable system,” which is why it stands today as the sole commercial source of these machines.
That sole-supplier position makes ASML the second great chokepoint in the chip story, alongside TSMC. The most advanced chips require EUV machines; EUV machines come only from ASML. This is why ASML sits at the heart of the export-control story: restricting the sale of advanced lithography equipment is a direct lever on who can manufacture leading-edge chips at all, which is precisely why these machines have been a focus of U.S. and allied export controls.
Why business readers should care: ASML is upstream of even the fabs. If TSMC is where advanced AI chips are made, ASML is who makes the single most critical machine those fabs need. A monopoly that narrow turns a piece of factory equipment into a geopolitical instrument and a hard limit on global chip supply.