Key Highlights

• ASML fell 7.06% in the June 23 semiconductor equipment selloff despite possessing a complete monopoly on extreme ultraviolet (EUV) lithography — the only technology capable of manufacturing chips at 5nm and below — with the decline reflecting categorical sector selling rather than any fundamental challenge to ASML's irreplaceable position in the global semiconductor supply chain.
• As South Korea's KOSPI suffered its largest single-day drop in history on the back of Samsung and SK Hynix declines, ASML's significant exposure to Korean memory chipmakers as customers amplified the market's concern that any moderation in Korean advanced chip investment will defer high-value EUV tool orders.

ASML Holding N.V. (NASDAQ: ASML) fell 7.06% on June 23, 2026, in a decline that highlights one of the most interesting dynamics in high-quality, monopoly-position businesses: even companies without viable competition are not immune to sector-level sentiment events. ASML manufactures extreme ultraviolet (EUV) lithography systems — the machines that project circuit patterns onto silicon wafers using wavelengths of light so short that they must be generated in a vacuum. No other company in the world manufactures EUV tools. TSMC, Samsung, Intel, and SK Hynix cannot advance to leading-edge semiconductor nodes without ASML's machines. This is perhaps the most durable competitive moat in the global technology supply chain.

And yet on June 23, ASML fell 7.06%. Understanding why requires separating the company's structural competitive position — which is unassailable — from the near-term order cycle dynamics — which are not.

ASML's revenue comes from selling EUV and deep ultraviolet (DUV) lithography systems to chipmakers. Each EUV High-NA tool (ASML's most advanced product, required for sub-2nm nodes) costs approximately 380 million euros. These are not commodity purchases — they are multi-year capital commitments planned years in advance. When chipmakers face a period of demand uncertainty, they do not cancel EUV orders; they defer them. ASML's backlog is long and contractually firm. However, the pace of new orders — the leading indicator of future revenue — is sensitive to chipmaker capex sentiment.

SK Hynix's June 23 announcement of slowed advanced AI chip production is directly relevant to this order dynamic. ASML has been supplying EUV tools to SK Hynix for its most advanced DRAM and HBM manufacturing. If SK Hynix is temporarily redirecting production capacity toward commodity DRAM — manufactured on mature DUV nodes rather than leading-edge EUV nodes — the urgency of accelerating EUV tool deliveries diminishes. This is a deferred, not cancelled, demand scenario, but the equity market priced it as an immediate revenue risk.

The South Korean market context amplified the concern. The KOSPI's historic 10% single-day decline — on Samsung and SK Hynix losses — created a narrative of Asian semiconductor distress that spread to ASML as a primary supplier. At a market capitalisation of 722.78 billion USD, ASML is Europe's largest technology company. The 7.06% decline represents billions in market value generated by a combination of categorical selling and Korean market contagion — applied to a business whose fundamental competitive position improved not at all on June 23.

For long-term investors, ASML's monopoly position in EUV and its High-NA roadmap through the remainder of the decade represent a durable compounding thesis that is unaffected by a single session's AI capex anxiety. The order deferral risk is real but temporary; the structural demand for EUV at every advanced node is permanent.