ADYEY vs FISV: Which Is the Better Buy in 2026?
Last updated October 2026
Short answer
ADYEY is the larger of the two ($33.21B market cap): the incumbent the market prices for continued execution (19.13x forward earnings, beta 1.89). FISV is the smaller challenger ($25.29B), cheaper on forward earnings (5.94x): more room to run, but more to prove. The real question is which set of drivers you believe, and whether owning one (or both) leaves you over-concentrated.
ADYEY vs FISV: the tie-breaker metrics
Same yardstick, side by side (as of October 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | ADYEY | FISV | What it tells you |
|---|---|---|---|
| Market cap | $33.21B | $25.29B | Size. The larger name is the incumbent; the smaller has more room to grow and more to prove. |
| Forward P/E | 19.13 | 5.94 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 25.05 | 9.13 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Price vs 52-week range | 17% of range | 4% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
Reading it: FISV is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.
Before you buy: how ADYEY and FISV affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. ADYEY and FISV share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined ADYEY and FISV exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does Adyen N.V. (ADYEY) do?
Adyen N.V. is a Dutch financial technology company, founded in 2006 and listed on Euronext Amsterdam since 2018 (ticker ADYEN), that processes card and alternative payments for merchants on a single, internally built platform. Instead of stitching together acquired systems the way many legacy processors did, Adyen acts as gateway, risk engine, acquirer and, in many markets, issuer and banking provider on one codebase, which lets a global merchant accept payments online, in an app and at a physical terminal with one contract and one view of the customer. It reports in three segments: Digital (e-commerce and app payments, its largest business at ~€720 million of H1 2026 net revenue), Unified Commerce (online plus point of sale for retailers, ~€418 million, up ~25%) and Platforms (embedded payments and financial products for software platforms and marketplaces, ~€166 million, up ~37%). In H1 2026 Adyen processed ~€804 billion of volume, up ~24% year over year, and earned ~€1.30 billion of net revenue (revenue after interchange and scheme fees), up ~19% reported and ~21% in constant currency.
What does Fiserv (FISV) do?
Fiserv is one of the largest payments and financial-technology companies in the world. It operates broadly in two areas: merchant solutions, where it processes card and digital payments for millions of businesses and runs the Clover point-of-sale and small-business platform, and financial solutions, where it provides core account processing, card issuing, digital banking, and related technology to banks and credit unions. Most of its revenue is recurring and transaction-based, tied to the volume of payments and accounts it processes, which gives the business a steady, infrastructure-like quality. Fiserv changed its listing to the Nasdaq and reinstated its original ticker symbol FISV (from FI) in November 2025.
ADYEY vs FISV: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- ADYEY drivers: Platforms and embedded finance; Unified commerce with large retailers.
- FISV drivers: Recurring, transaction-based revenue; Clover platform growth.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: Valuation is the most immediate risk: at roughly 25 to 27 times trailing earnings, Adyen trades at a large premium to processors such as Fiserv, Global Payments and PayPal, and the shares have repeatedly fallen 15% to 40% in a day when growth or margin guidance disappointed (August 2023 and February 2026 are the examples). For FISV, the main risk is that Fiserv's growth is modest, so slowing organic revenue growth, margin pressure, or weaker free cash flow can disappoint investors, as the roughly 60% share decline over the past year and the 2026 guidance cut showed.
ADYEY or FISV: which should you pick?
Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick ADYEY if you believe its drivers more; FISV if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the ADYEY and FISV guides.
ADYEY vs FISV: the full fundamentals
ADYEY. Trailing figures combine reported H2 2025 (derived from FY2025 net revenue of ~€2.36 billion, EBITDA of ~€1.25 billion and net income of ~€1.06 billion) with H1 2026 (net revenue ~€1.30 billion, EBITDA ~€642 million, net income ~€544 million); USD values are approximate at recent exchange rates. Adyen guides on constant-currency net revenue growth of 21% to 23% for 2026 and an EBITDA margin about 1 point below 2025 including acquisitions, with a target above 55% by 2028. The Q3 2026 business update, which covers volume and net revenue but not full profit figures, is scheduled for late October 2026.
FISV. Fiserv is still solidly profitable, and at about 6 times forward earnings the market is pricing in a long, uncertain recovery rather than a return to its old growth rate. The questions that decide the multiple are whether organic growth stabilizes, how quickly Clover reaccelerates, and whether the lowered 2026 outlook holds, with the November 3 report as the next checkpoint. Figures are as of October 16, 2026 and change daily.
Headline figures (approximate, October 2026): ADYEY shows net revenue (ttm) ~€2.57B (~$3.0B), net revenue growth (h1 2026) ~19% reported, ~21% constant currency, ebitda (ttm) ~€1.34B (~52% margin), net income (ttm) ~€1.13B (~$1.3B); FISV shows revenue (ttm) ~$19.5 billion across the last four reported quarters; 2025 revenue ~$19.8 billion, revenue (q2 2026) ~$4.96 billion; Q3 consensus ~$4.87 billion, net income ~$2.8 billion over the last four quarters, down from ~$3.5 billion in 2025; Q2 2026 ~$627 million, adjusted eps (q2 2026) $1.84 vs ~$1.91 consensus (miss); Q1 2026 $1.79 vs ~$1.57 (beat).
The bottom line: ADYEY vs FISV
ADYEY and FISV are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined ADYEY and FISV exposure against your real portfolio. It is not an investment adviser.
Wondering how ADYEY or FISV fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in Adyen N.V. with AI
Connect the broker you already use and ask Walnut's AI how ADYEY fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between ADYEY and FISV?
+
Adyen N.V. Fiserv is one of the largest payments and financial-technology companies in the world. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is ADYEY or FISV the better stock?
+
Neither is universally better. ADYEY is the larger incumbent; FISV is the smaller challenger and looks cheaper on forward earnings. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, ADYEY or FISV?
+
On forward P/E (as of October 2026), ADYEY trades at 19.13x and FISV at 5.94x, so FISV is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both ADYEY and FISV?
+
Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of ADYEY vs FISV?
+
ADYEY: Valuation is the most immediate risk: at roughly 25 to 27 times trailing earnings, Adyen trades at a large premium to processors such as Fiserv, Global Payments and PayPal, and the shares have repeatedly fallen 15% to 40% in a day when growth or margin guidance disappointed (August 2023 and February 2026 are the examples). Competition is intense, especially from privately held Stripe and from Checkout.com in enterprise e-commerce, and large merchants can and do shift volume between providers, which makes take rates and volume growth sensitive to a handful of very large customers. Adyen's net revenue is tied to consumer spending and cross-border commerce, so a global slowdown or tariff-driven trade disruption would show up quickly in processed volume. The two 2026 acquisitions introduce integration risk for a company whose culture was built on building everything in-house, and its banking licences put it under heavy regulatory and anti-money-laundering scrutiny in Europe and the US. For ADYEY holders specifically, returns are also affected by the euro to dollar exchange rate and by the wider spreads of an unsponsored OTC listing. FISV: The main risk is that Fiserv's growth is modest, so slowing organic revenue growth, margin pressure, or weaker free cash flow can disappoint investors, as the roughly 60% share decline over the past year and the 2026 guidance cut showed. Execution risk around internal initiatives like Project Elevate is a real concern; if efficiency and growth improvements lag, sentiment can stay pressured. Competition is intense across both merchant acquiring and bank technology, from large processors and fast-growing fintechs alike, which can pressure pricing and share. Payment volumes are tied to consumer and business spending, so an economic slowdown would weigh on results. The bank-technology business depends on long sales cycles and the health of its financial-institution clients. Fiserv also carries debt from past acquisitions, so interest costs and integration matter. Regulatory changes in payments, interchange, and data handling add uncertainty. Litigation tied to the reset is another watch item, as some plaintiffs point to it in their claims. None of these threaten the franchise's core, but together they explain why a scaled leader can still see its stock struggle when growth and execution come into question.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell ADYEY or FISV; figures are approximate and dated (as of October 2026). Verify current data before investing.