Investing term
What is ASML?
Dutch semiconductor-equipment company that makes the EUV lithography machines every advanced chip is manufactured on — a global monopoly with no US peer.
ASML is a Dutch company that builds the extreme-ultraviolet (EUV) lithography machines used to print the circuitry on the world's most advanced computer chips. It is effectively the sole supplier of this technology — no other company can make these machines, so every leading-edge chip on Earth is manufactured on ASML equipment.
That makes it a rare example of a near-total monopoly at a critical chokepoint of the global economy: advanced computing, AI, and smartphones all ultimately depend on it. As an investment case it's a textbook wide moat — enormous switching costs, decades of accumulated know-how, and no viable competitor. But it also carries concentration and geopolitical risk (it sits at the centre of US-China chip tensions), high cyclicality, and a rich valuation. It's used here as a real-world illustration of a monopoly-grade moat, not as a recommendation.
Every advanced chipmaker must buy their EUV machines from ASML — the sole supplier. It's a textbook wide moat, though even a great company carries risk and isn't a guaranteed buy at any price.
For example
Every chipmaker producing the most advanced processors — for AI, phones, and data centres — must buy their EUV machines from ASML, because no one else makes them.
Learn it by doing
That's ASML in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 19, Beyond Stocks).
Try the free lesson →Why it matters to you
ASML matters as a vivid illustration of an economic moat at its widest: a company so entrenched at a critical bottleneck that it has no real competitor. It shows what durable competitive advantage — switching costs, know-how, scale, and a technological lead measured in decades — actually looks like in practice. It's also a lesson that even a fantastic business carries risks (geopolitics, cyclicality, valuation), and that a great company is not automatically a great investment at any price.
⚠ Assuming a great company is always a great buy
A dominant, moat-rich business like ASML can still be a poor investment if bought at too high a price, or if concentration and geopolitical risks materialise. Confusing 'this is an extraordinary company' with 'this is a guaranteed winning stock at any price' ignores valuation and risk. Even the best businesses can disappoint investors who overpay.