Fiserv delivered a strong second quarter, with total adjusted revenue up 8% to $5.2 billion, adjusted EPS up 16% to $2.47, and adjusted operating margin expanding 120 basis points to 39.6%, led by 30% Clover revenue growth and rising value-added services penetration. However, the company refined its full-year organic revenue growth guidance to approximately 10%, the low end of its prior 10%-12% range, as several new product launches and strategic initiatives are taking longer than planned, and it trimmed its full-year margin expansion outlook from at least 125 basis points to about 100 basis points on dilution from recent acquisitions. Fiserv raised its share repurchase plan to roughly 130% of free cash flow and maintained its $3.5 billion 2025 Clover revenue target.
Thank you, and good morning. With me on the call today are Mike Lyons, our Chief Executive Officer, and Bob Hau, our Chief Financial Officer. The earnings release and supplemental materials for the quarter are available on the Investor Relations section of fiserv.com. Please refer to these materials for an explanation of the non-GAAP financial measures discussed on this call, along with a reconciliation of those measures to the nearest applicable GAAP measures. Unless otherwise stated, performance references are year-over-year comparisons. Our remarks today will include forward-looking statements about, among other matters, expected operating and financial results and strategic initiatives. Forward-looking statements may differ materially from actual results and are subject to a number of risks and uncertainties. You should refer to our earnings release for a discussion of these risk factors. Now, I'll turn the call over to Mike.
Thank you, Julie, and thank you all for joining us today. As you've seen, we had a strong second quarter, fueled by our continued focus on executing Fiserv's mission of delivering superior value for our stakeholders through leading technology, innovation, and excellence in everything we do. During the second quarter, we grew sales, clients, and our new business pipeline. We announced several exciting new partnerships and acquisitions, introduced innovative capabilities like FIUSD Stablecoin, and made solid progress on our key product initiatives, including Clover, Commerce Hub, Cashflow Central, and Experience Digital, also known as XD. We did this all despite an uncertain macro environment during the quarter. For the second quarter, we delivered 8% adjusted and organic revenue growth and strong 16% Adjusted EPS growth. We expanded our adjusted operating margin and generated good free cash flow.
Importantly, we returned $2.2 billion to shareholders in the quarter by repurchasing 12.2 million shares, or 26% more than we repurchased in Q1. As Bob will cover later, we have increased our 2025 share repurchase guidance to approximately 130% of free cash flow. This means we expect to continue actively buying shares in the second half of the year, all while staying within our targeted leverage range. Before Bob walks you through our financial performance in more detail, I'd like to provide some color around the refinements we made to our guidance and share some important business highlights from the quarter. The 2025 guidance, which called for 10%-12% organic revenue growth on top of the 16% growth we achieved in 2024, had always assumed a significant growth ramp on the back half of the year.
This trajectory was based on the successful launch of a long and granular list of new products and strategic initiatives, as well as a relatively strong macroeconomic outlook. Our updated guidance reflects the fact that some of those launches and initiatives are taking longer than we had planned. Some of that is on us, and some is driven by other factors that we don't fully control, but we are confident that we will capture the full strategic and financial benefits, and only the timing of realizing them has been extended. To a lesser degree, our update reflects economic conditions that we have seen versus what had been assumed in the plan. As a result, we have refined our full-year organic revenue growth guidance to approximately 10%, which is at the low end of our guidance range.
To be clear, we are maintaining our guidance for $3.5 billion of Clover revenue this year. With this revised ramp in revenue growth in the back half, continued margin improvement, and the increased share repurchase guidance, we are also refining our Adjusted EPS guidance by raising the bottom end of our range by $0.05. Looking ahead, I am incredibly energized by the opportunities we have to generate significant shareholder value over time. By providing mission-critical software and value-added solutions for merchants, financial institutions, governments, and other yet untapped markets. The construct of the company. Our many leadership positions, and our size and scale are unmatched, yet we are just scratching the surface of our global opportunities. When we put all these strengths together, the result is deep, long-standing client relationships that can be broadened and improved over time. As we add more value-added products and services.
This strategy produces highly recurring revenue, strong profits, and substantial free cash flow that allow us to continue prudently and effectively allocating capital and generating double-digit Adjusted EPS growth, a virtuous Fiserv cycle. Now, let me turn to some of the highlights from our two business segments. In Merchant Solutions, we continue to execute on three key growth initiatives and are pleased with the progress we made on each in Q2. The first is driving Clover growth through new products, new markets, new partners, and new geographies. The second is continuing to scale our industry-leading distribution through all channels. Third is adding new and existing enterprise merchant clients to our Commerce Hub platform and driving vast penetration. Let's start with Clover, where Q2 volume growth came in line with our expectations at 8% reported and 11% excluding the gateway conversion.
As a reminder, for operational reasons, we converted merchants from a non-Clover payments gateway to Clover ending in 2024. The 11% represents the growth rate of Clover without the converted portfolio. With respect to the second half of 2025, we expect Clover volume growth, both on a reported basis and excluding the gateway conversion, to accelerate from Q2 levels. These levels are consistent with our plan to reach $3.5 billion in Clover revenue for the year. Clover revenue grew 30% in Q2, highlighting the strength of our full business operating system approach. There are three key contributors to Clover's revenue. First, vast penetration of 24%, which was up from 20% a year ago. This was in line with Q1 levels and demonstrates good progress towards our year-end goal of 25%.
Total vast revenue grew 52%, driven by both software sales and capital, which includes Clover Capital and anticipation in Latin America. Second, hardware sales remained healthy and within the expected long-term range of revenue contribution. Finally, pricing and other services, including data. We expect our newer initiatives to support Clover revenue and volume growth in the second half of the year, so I'll update you on their progress. On the international buildout, we are ramping Clover merchants in all the geographies we added this year: Brazil, Mexico, Australia, Singapore, and various countries in Europe as we work to integrate the CCB acquisition. We added Belgium and support sales in Germany and the Netherlands. The largest of these opportunities is Brazil, where we launched Clover sales in April and are tracking well to plan.
I'm excited to add that this morning we significantly increased our presence in Canada, our largest Clover international market, with the agreement to become the merchant processing provider for TD Bank Canada. Going forward, we will jointly serve new TD merchant clients via the Clover platform, driving further processing, hardware, and SaaS revenue. As part of the transaction, we also agreed to purchase a portion of TD Bank's existing merchant processing business, consisting of over 35,000 enterprise and mid-market locations. We've been live with Clover in Canada for over five years and have seen strong growth through direct sales and ISO partnerships. The opportunity to further strengthen our distribution by aligning with the nation's second-largest bank is tremendously exciting. We expect to close the transaction later this year. With respect to further international expansion of Clover, we are having constructive conversations with potential partners in several attractive markets.
In Q2, our vertical software offerings got a boost with two market expansion efforts. In May, we launched Clover Hospitality for the upper restaurant market, which doubled our TAM in the sector. The product became available this month, and pre-sales activity has been encouraging. Earlier this week, we signed a new partnership with Rectangle Health to integrate a HIPAA-compliant SMB solution called Clover Practice Pay for healthcare providers. This solution launches in early 2026 and marks a significant milestone for Clover, extending its reach beyond core verticals of restaurant, retail, and personal services and into one of the country's largest, most in-demand, and most rapidly evolving markets. S&B healthcare also represents one of the areas of greatest demand from our financial institution merchant partners.
This agreement reinforces our confidence in the ability to scale Clover into additional verticals where we can use our industry-leading technology or partner to design operating systems for S&Bs across industries, creating additional TAM over time. We made further advances with our horizontal software solutions as well, continuing to develop Clover as a full small business operating platform. Since its launch in November, the ADP relationship has been exemplary as our sales, product, and executive teams continue to find ways to optimize our partnership. We are making it easy for S&Bs to access our combined suite of leading solutions on platforms they know and trust, Clover and ADP's run solution. In May, the ADP run software platform was integrated into Clover, and the sales rollout is ongoing through August.
ADP Salesforce is generating Clover leads and vice versa, and they will be able to sell Cashflow Central as well by the end of the year. Earlier this month, we expanded our partnership with Homebase to integrate their market-leading software into our Clover Essential SaaS package, allowing S&Bs to manage employee scheduling, time tracking, and team communication right from the Clover dashboard. For our second merchant initiative, we continue to invest in and expand our unmatched set of distribution channels, which is a key differentiator for Fiserv and Clover. This includes continuing to build out our direct sales force and expanding our financial institution merchant referral partner program. We have roughly 600 direct salespeople in the S&B space, and we continue to grow that team, most recently to support Clover Hospitality. Our merchant referral partner program also continues to grow.
We added 49 new financial institutions as merchant partners in Q2, bringing our year-to-date total to 82. In June, we reached an agreement to acquire the remaining 49.9% of AIB Merchant Services, our long-standing and successful joint venture with AIB Bank in Ireland. We expect this change will open further opportunities for us to grow in both the enterprise space throughout Europe and with Clover. AIB will continue to work exclusively with us through a merchant referral program. In July, we expanded our relationship with Bank of Hawaii through a new revenue-sharing agreement that transitions their merchant portfolio to Fiserv, enhancing our economics while enabling the bank to elevate its merchant capabilities and broaden its client offerings. As of last week, we're excited to announce that Clover is now part of US Foods' Czech Business Tools program, a program that recommends value-added solutions to their client base.
Thank you, Mike, and good morning, everyone. If you're following along on our slides, I'll cover additional details on total company and segment performance, starting with our financial metrics and trends on slide four. We delivered another strong quarter highlighting our consistent ability to grow revenue and expand margin.
Second quarter total company adjusted revenue grew 8% to $5.2 billion. Adjusted operating income grew 12% to $2.1 billion. Resulting in an adjusted operating margin of 39.6%. An increase of 120 basis points versus the prior year. For the first half of the year, adjusted revenue grew 7% to $10 billion. Adjusted operating income grew 11% to $3.9 billion, resulting in an adjusted operating margin of 38.7%, an increase of 150 basis points versus the prior year. Organic revenue grew 8% in the quarter, driven by solid performance in both segments. Through the first six months, organic revenue also grew 8%. Second quarter adjusted earnings per share was $2.47, compared to $2.13 in the prior year, up 16%, and in line with our full-year growth guidance of 15%-17%. Year to date, our adjusted earnings per share increased 15% to $4.61, compared to $4 in the prior year.
Free cash flow for the quarter was $1.2 billion, and $1.5 billion for the first half of the year. As we said in previous earnings calls, we expect an increase in free cash flow in the back half of the year, which reflects typical seasonality for us, including the timing of inflows related to the green tax credit initiative. We continue to expect approximately $5.5 billion of free cash flow. Turning to performance by segment. Starting on slide five, organic revenue growth in the Merchant Solutions segment was 9% in both the quarter and year to date. This compares to 28% growth in Q2 2024 when excess inflation and interest in Argentina and the Dollar Turista program contributed 12 points of revenue organic growth. Inflation and interest rates in the country are now below the five-year historical average, and the Dollar Turista is much smaller than the prior year.
Adjusted revenue growth in the Merchant Solutions segment was 10% in the quarter and 8% year to date. This growth includes $55 million in inorganic revenue from the CCB acquisition in Europe, partially offset by an FX headwind. Moving to the business lines, small business organic revenue growth in the quarter was 9%, while adjusted revenue grew 11% on 9% volume growth, which includes volume from our recent acquisition. This performance was largely driven by continued strength in Clover, supported by direct and partner sales, expanded vertical coverage, and continued strength in the adoption of value-added services that reinforce Clover's role as a full business operating system. Clover revenue grew 30% in the second quarter on annualized reported payment volume growth of 8%. Excluding the gateway conversion, the volume growth in Q2 2025 was 11%.
On slide six, as Mike said earlier, we expect volumes to accelerate in the second half, driven by a number of strategic initiatives, putting us on track to deliver at least 9% reported volume for the full year and at least 11% growth, excluding the gateway. The gateway impact to reported volume growth was a little over three points in Q2 and is expected to decline gradually through the second half and beyond, with the magnitude dependent upon retention of the converted merchant base. Fast penetration stayed constant sequentially at 24%, and it was driven by our working capital products, Clover Capital, Rapid Deposit, and Anticipation. We remain on track to meet our 2025 target of 25%. Non-Clover S&B revenue grew at a low single-digit pace.
Enterprise organic and adjusted revenue growth in the quarter was 12% and 8% respectively, driven by transactions growth of 14% and continued traction with Commerce Hub. We continue to advance e-commerce capabilities within the platform. For instance, this quarter, we delivered a hosted checkout experience, which redirects a customer to a secure, branded checkout page. Merchants can customize the page design using the checkout configurator tool. We also expanded our optimization via AI and machine learning, helping our clients to recover declines and increase savings through intelligent routing. Finally, processing organic and adjusted revenue in the quarter grew 5% and 7% respectively, driven in part by hardware sales, as well as an easier comparison as we start to lap the impact of strategic changes by clients who exited certain types of business. Year to date, processing organic and adjusted revenue are both down 1%.
Similar to our guidance for roughly flat organic revenue over the medium term. Second quarter adjusted operating income for the Merchant Solutions segment was up 4% to $914 million. Adjusted operating margin was 34.6%, down 200 basis points from the prior year. Year to date, adjusted operating income for the segment was up 4% to $1.7 billion, with adjusted operating margin down 100 basis points to 34.4%. The decline in Q2 adjusted operating margin reflects multiple factors, including investments in marketing and sales and distribution, the impact of the CCB acquisition, and increased investments in new software and hardware. Turning to slide seven on the Financial Solutions segment, organic revenue grew 7% in the quarter and 6% year to date, in line with our full-year outlook of 6%-8%. The quarter's results were driven by strong growth in issuing and digital payments business lines.
Looking at the business lines, digital payments organic and adjusted revenue each grew by 6% in the quarter. Results were driven by strong growth in Zelle transactions of 19%, partially offset by lighter debit card spending. Demand for real-time payments continues to rise, and our Star and Excel debit networks are seeing increasing transaction volumes as they continue to add cards. In issuing, organic and adjusted revenue grew 13% and 14% respectively in the quarter. This above-average growth was driven by sales of our data and analytics, which is a relatively new offering in its early stages of commercialization. While we're excited about our long-term prospects here, revenue is expected to be instrumented as this project-based market matures and will not drive this level of consistent revenue growth each quarter.
New verticals such as healthcare and government continue to ramp, while our education loans business just completed a migration cycle for a new portfolio of accounts. As a reminder, while Q2 represented our first full quarter of revenue since converting the Target Circle card portfolio in March, that growth was offset by the loss of a large retail card portfolio as that client was required to move to its bank's processing partner. Banking organic and adjusted revenue was flat in the quarter, reflecting three primary trends. First, some slower-than-expected implementations. Second, less activity in the market. Third, some greater pricing competition in particular areas, which has been heightened by slower activity. We continue to make progress on our core strategy. With FinSAC, we see strong growth opportunities in embedded finance, international banking, and the potential for a large bank core upgrade cycle.
As we've said in the past, the nature of this business line is such that it will be slower-than-average segment growth, but drive growth in other business lines. Second quarter adjusted operating income in the Financial Solutions segment was up 14% to $1.2 billion. Adjusted operating margin was 48.7%. Year to date, adjusted operating income for the segment was up 14% to $2.4 billion, with adjusted operating margin up 310 basis points to 48.1%. Reflecting the high margin data and analytics projects, mostly in Q2, as well as cost and efficiency actions. Now, let me wrap up with some remaining details on the financials. The corporate adjusted operating loss was $99 million in the quarter and $249 million year to date, in line with our expectations. The adjusted effective tax rate in the quarter was 18.9%, and 18.5% for the first half of the year.
We continue to expect the full-year rate to be approximately 19.5%. Total debt outstanding was $29.6 billion on June 30th. Our debt-to-Adjusted EBITDA ratio was steady at 2.9 times, within our target leverage range of two and a half to three times. During the quarter, we repurchased 12 million shares for $2.2 billion, bringing our total cash return to shareholders for the last 12 months to nearly $6.9 billion. We had 56 million shares remaining authorized for repurchase at the end of the quarter. As Mike said, we now expect to return more cash to shareholders this year through share repurchases, reflecting our strong balance sheet and cash flow and a disciplined evaluation of the opportunities in front of us.
We previously expected to return approximately 110% of free cash flow back to shareholders through share repurchase, and we now expect to return approximately 130%, which aligns to the upper end of our targeted leverage range. We are raising the bottom end of our adjusted earnings per share guidance range to $10.15 from $10.10, while maintaining the high end of the range at $10.30. The change reflects the refining of our organic revenue growth expectations to the bottom of our prior guidance range, offset by the benefit of higher share repurchase activity. We continue to expect an acceleration in organic revenue growth for the second half of the year, particularly in the Merchant Solutions segment.