⚠ Backlog Can Be Deferred or CancelledModerate threat

A large backlog — €38.8 billion at last count¹ — is reassuring, but it is not an ironclad guarantee of future revenue: orders can be deferred, rescheduled, or in some cases cancelled, and a backlog reflects customers' confidence at the time they ordered rather than an unbreakable commitment to take delivery on schedule. In a sharp downturn, customers facing overcapacity have historically pushed out deliveries of expensive equipment, and while ASML's machines are essential and its customers loath to lose their place in the queue, the timing of backlog conversion can slip, turning a reassuring order book into a source of quarter-to-quarter uncertainty.

ASML's recent decision to stop disclosing quarterly bookings sharpens this concern at the margin, because it removes the clearest real-time signal of whether demand is still accelerating or cooling — investors must now infer the trend from shipments and guidance, with a longer lag. The backlog remains vast and the demand genuine, and cancellations of leading-edge orders are rare because the machines are irreplaceable. But an investor should treat the backlog as strong evidence of demand rather than a contractual certainty of revenue, and remember that in the semiconductor industry's downturns, even committed orders have a way of arriving later than the order book first implied.