Xero Ltd (ASX: XRO) has already become a major global technology business, but I think it is still a long way from reaching its potential.
What catches my attention is the gap between how established Xero feels today and how much of its market it has actually captured.
That is a big reason why it could be my top ASX tech stock to buy and hold.
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The opportunity is still enormous
Xero finished FY26 with 4.92 million customers globally.
That is an impressive base, particularly for a company that started in New Zealand less than two decades ago. Yet Xero estimates that it has a total addressable market of around 100 million small and medium-sized businesses globally.
I think that gives investors a good sense of the opportunity that remains.
Australia shows what Xero can become when it establishes a strong position. The company already has around 2.1 million customers here, and management acknowledges that the market is relatively deeply penetrated.
The United States tells a very different story. Xero had around 424,000 US customers at the end of FY26. That is still a relatively small presence in what management considers one of its three most important markets.
For me, that is where the story becomes particularly exciting.
Xero is becoming more relevant to each business
Winning more customers is only one part of the opportunity.
Xero started with accounting software, but small businesses have many financial jobs to complete every day. They need to pay suppliers, collect money from customers, run payroll, monitor cash flow, reconcile transactions, and understand how the business is performing.
The ASX tech stock is gradually bringing more of those activities onto the same platform.
The acquisition of Melio has been particularly important in the United States because it allows businesses to manage outgoing payments directly through Xero. Management estimates the US small business payments opportunity alone at US$29 billion.
I think this changes the way investors can think about Xero. Over time, it could become the place where that business completes much more of its financial administration.
That creates more opportunities for Xero to provide value and potentially earn more from each customer.
The US could change the size of Xero
Australia and New Zealand gave Xero its foundation, while the UK has become another substantial market.
I think success in the United States could take the company to another level.
The combination of accounting, payments, and payroll gives Xero a much broader proposition than it had several years ago. Management is also developing JAX, its artificial intelligence platform, to automate more financial tasks and help customers make decisions using the information already sitting inside Xero.
There is plenty that still needs to go right. Xero faces major competitors in the United States, and integrating Melio successfully will be important.
But when I look beyond the next quarter or even the next year, I see a company with millions of customers and a market opportunity many times larger than its current footprint.
Foolish Takeaway
Xero already feels like one of the ASX's biggest technology success stories.
I think the more exciting part is how much room remains.
If Xero can win a larger share of the tens of millions of small businesses in its key markets and become increasingly important to how those businesses manage their finances, I believe it could be a significantly larger company by the 2030s.
That is why Xero could be my top ASX tech stock to buy and hold for the long term.
