FIS vs FISV: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of August 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.

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. FIS 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 FIS 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.

Fidelity National Information Services, Inc. is a global financial-technology company that provides the software and services banks, capital-markets firms, and merchants run on. It operates mainly through two segments, Banking Solutions (core processing, digital banking, payments, and related software for financial institutions) and Capital Market Solutions (trading, treasury, lending, and risk technology for buy-side and sell-side firms). FIS serves more than 20,000 clients across over 130 countries and processes trillions of dollars in transactions each year, which makes it more of an embedded infrastructure vendor than a consumer-facing brand. Because its software is woven into clients' daily operations, revenue is heavily recurring and switching costs are high.

Full FIS guide

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.

Full FISV guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• FIS drivers: Sticky, recurring banking software; Capital Markets momentum.
• FISV drivers: Recurring, transaction-based revenue; Clover platform growth.

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: The main risk is that FIS is a mature, slower-growing business competing against strong rivals, so growth can disappoint if bank IT spending softens or clients delay projects. 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 2026 share weakness showed.

Pick FIS 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 FIS and FISV guides.

FIS. Figures are approximate and tied to the asOf date; verify live numbers before acting. The January 2026 close of the Issuer Solutions acquisition and Worldpay sale makes reported and pro forma growth figures diverge sharply, so read guidance carefully and check which basis a number uses. FIS trades as a mature, cash-generative software and payments company, so investors tend to weigh recurring-revenue durability, margin expansion, and deleveraging progress more than headline growth.

FISV. Figures are approximate and tied to the asOf date; verify live numbers before acting. Fiserv is a profitable, cash-generative company, so an earnings multiple is meaningful, and the 2026 share weakness left some valuation metrics looking discounted versus its history. But the market's concern is the pace of organic growth, margins, and free-cash-flow recovery, so investors should weigh those trends and execution on internal initiatives rather than the multiple alone.

Headline figures (approximate, Jul 2026): FIS shows revenue (ttm) ~$10 to 11 billion (2025 revenue was roughly $10.7 billion; segment mix shifts after the January 2026 Issuer Solutions and Worldpay transactions), 2026 revenue growth guidance ~mid-single-digit pro forma (roughly 5% to 6%), with much larger reported/adjusted growth reflecting the Issuer Solutions consolidation, adjusted ebitda margin ~high-30s percent, with guidance for continued margin expansion, market cap ~$20 billion (stock in the roughly $40 range in mid-2026); FISV shows revenue (q1 2026) ~$5.03 billion, down about 2% year over year, adjusted eps (q1 2026) ~$1.79, beating expectations though down year over year, gaap eps (q1 2026) ~$1.07, 2026 guidance organic revenue growth ~1% to 3%; adjusted EPS ~$8.00 to $8.30 (reaffirmed).

FIS 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 FIS and FISV exposure against your real portfolio. It is not an investment adviser.