⚠ The Biggest Customers Have the Most PowerModerate threat

The enterprise focus that gives Adyen its quality also concentrates its revenue in a set of enormous, sophisticated customers who hold real power over it — and that power is a structural check on the moat. The largest merchants drive a meaningful share of Adyen's volume, and they are the most capable buyers in the world: they multi-source their payments across several providers by design, they command the best pricing through their scale and their ability to shift volume, and they can — and the very largest do — consider building their own payment capabilities in-house. Adyen serves these giants superbly and wins large shares of their volume on merit, but it does so as one of several providers to customers who deliberately preserve their leverage and their alternatives.

This customer power expresses itself continually in pricing and in concentration risk. On pricing, the largest merchants push relentlessly for better rates, using their volume and their multi-sourcing to compress take rates — a persistent downward pressure on Adyen's economics that grows as the biggest, lowest-priced accounts become a larger share of volume. On concentration, the reliance on a set of large customers means that the loss, reduction, or in-housing of even a few major relationships would matter, and that Adyen's growth depends on the health, spending, and continued patronage of a concentrated set of giants. Adyen manages this well — its customer base, while weighted toward large accounts, is diversified across many enterprises and industries, and its value proposition wins it durable share — so this is a check on the moat, not a crippling dependence. But an investor should recognize that Adyen's best asset, its book of the world's largest companies, is also a source of real customer power: giants who multi-source, squeeze on price, and hold the option to insource, ensuring that Adyen competes for its most important revenue continually and on the customers' terms as much as its own — a fundamental reason the moat, built on excellent customers, is narrow rather than wide — the 2023 margin scare began exactly there¹.