Fiserv was recently named the #1 merchant acquirer in the U.S. Here’s what that means for the clients we work with every day.

In 2025, Fiserv processed $2.6 trillion in merchant transactions in the U.S. According to the Nilson Report¹, that makes us the number one merchant acquirer.

It’s big news for Fiserv, but that scale only matters if it translates into real value for the people and businesses we serve. The critical question is, “What does this scale mean for our clients?”

Let’s talk about it.

Payment choice is an opportunity

When it comes to payments, our priority is to provide choice. We want every client to be able to let their customers pay however they want. That can include credit, debit, digital wallets, alternative payments such as ACH or stablecoin, or other local payment methods – anything that helps the merchant run and grow their business. 

Our scale is what makes that choice possible. Processing at the volume we do means a client expanding across markets gets the same reliable payment experience in each one, without needing to rebuild systems or manage multiple partners every time they cross a border.

One way we’re extending access is through Commerce Hub, our global gateway platform. A single set of APIs, a unified developer layer and reporting give merchants the consistency they need regardless of where they operate, while also providing sophisticated optimization and fraud controls that can be configured to fit any business model. Our scale means we're powered by more data than anyone else, which enables us to provide market-leading optimization tools for our clients.

Connectivity isn’t one-size-fits-all. A large enterprise might need global routing flexibility and hyper-sophisticated fraud tools. The local coffee shop just wants its customers to be able to pay by digital wallet or Zelle®. We can make both happen. 

Whenever, wherever and whatever the need, it’s the network access and choice that turn scale into opportunity.
 

Performance is a promise

Operating at scale requires infrastructure, redundancy and recovery capabilities that support growth without compromise. These are our utmost priority. For our clients, those capabilities determine whether a transaction is approved, a customer is served and a business moves forward.

We know a failed authorization can cause a lost sale. An outage can break a relationship. Payment performance affects customer experience, employee productivity, inventory movement and revenue in real time. 

Our systems are built to identify incidents long before they affect clients or consumers. Each month, we run more than a million functional, real-life scenario and performance tests to validate readiness, detect issues early and prepare for recovery with high confidence and high speed. Our commitment to service, security, reliability and resilience includes zero tolerance for error in decision-critical workflows, and 99.999% uptime. 

Market leadership is an entry point to innovation

Fiserv operates across all aspects of a transaction. We provide the technology infrastructure that enables a merchant to accept a payment and a bank to authorize it. We also enable the network, routing and settlement between them. 

Operating in this unique position – at the intersection of finance and commerce – gives us the capacity to turn everyday payment activity into new products that solve challenges across the payments ecosystem.

For example, Commerce Hub for Platforms gives software companies and marketplaces unified access to payments and embedded finance through a single, modular architecture, so they can adopt capabilities as they grow. Platforms can turn money movement into revenue streams and embed financial products – accounts, cards, lending, payouts – directly into the experience their customers already use. That kind of cross-business solution is possible because we operate across the full transaction and can bring acquiring, banking and money-movement capabilities together in one place. For platforms, that means offering sophisticated financial services to their customers without having to build the underlying infrastructure themselves.

Agentic commerce is another example. Our processing scale means we can see where consumer behavior is heading before most others. For larger enterprises, we are a flexible partner that can integrate their existing payments stack to agentic protocols and AI platforms. For small businesses, we use that same experience and scale to offer turnkey solutions that make their products discoverable and purchasable through AI agents without any added technical requirements. At Fiserv, we measure success by whether an agent can transact securely and whether merchants feel confident they understand who acted, why and under what authorization. Getting this right turns agentic commerce from a cool demo into something that can scale across millions of merchants.

For the merchants and financial institutions we partner with, our scale provides access to that innovation pipeline without having to bear the full cost of building it themselves or needing to bring the necessary expertise in-house.
 

Scale is a difference maker for small business

Small businesses create jobs, serve neighborhoods and often operate with little room for error. A restaurant owner in Phoenix or a salon owner in Atlanta doesn’t care if we’re the biggest. They care about efficiently running their business. For SMBs, better technology can mean faster checkout, fewer missed sales, better cash flow and more time spent serving customers. 

Our scale creates opportunities for us to simplify complex processes on behalf of our clients.

We have almost four million small- and mid-sized businesses in our ecosystem, including 900,000 Clover customers, to whom we provide services that help business owners to grow and run their business, including payment acceptance, cash flow management, capital access and integrated vertical software. We have expanded into healthcare and professional services, adding horizontal capabilities through partnerships with ADP, Homebase and Melio, and expanding globally into markets like Brazil, Canada and Japan.
 

Credit goes to our clients

There’s only one reason Fiserv is the largest merchant acquirer in the U.S. It’s because millions of merchants, including the world’s largest and fastest-growing enterprises, trust us to power their growth at scale. 

It’s what we do with our position that matters most. Our commitment is to deliver better uptime, deeper network access, accelerated innovation, stronger capabilities for small businesses and operationally excellent service.

In other words, we believe our clients should be better off because of our size. We exist to help make our clients’ businesses more resilient, more connected and better prepared for whatever comes next. That’s the standard we hold ourselves to. And it’s the one you should hold us to as well.

You are the reason we are where we are, and we are grateful for it.

1. Nilson, "Nilson Report," March 2026