FISV vs TOST: 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.

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.

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. FISV and TOST 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 FISV and TOST 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.

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

Toast is a Boston company that sells restaurants one system to run the whole operation on: cloud point-of-sale software, kitchen displays, Toast Go handheld terminals, digital ordering, payroll, and lending products aimed at operators. Revenue arrives in three streams that are really three different businesses. Financial technology solutions, which is payment processing, was ~$1.57 billion of the ~$1.91 billion Toast booked in the second quarter of 2026, yet carried only ~$359 million of gross profit, because most of that line is interchange and network fees the company never keeps. Subscription services were ~$290 million and produced ~$226 million of gross profit, a margin near ~78%. Hardware and professional services brought in ~$48 million against ~$116 million of cost, which is to say Toast sells terminals below cost on purpose to win the payment flow that follows. The platform reached ~180,000 locations as of June 30, 2026, up ~22% year over year, processed ~$60.7 billion of payment volume in the quarter, and employed ~6,500 people at the end of 2025.

Full TOST guide

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

• FISV drivers: Recurring, transaction-based revenue; Clover platform growth.
• TOST drivers: Location adds, plus the retail and international extension; Software attach on top of the payment flow.

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 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. For TOST, the clearest specific risk is regulatory.

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 FISV if you believe its drivers more; TOST 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 FISV and TOST guides.

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.

TOST. Quoting a revenue multiple on Toast flatters it, because ~82% of the revenue line is payment processing that arrives with interchange and network fees already attached. Gross profit and ARR are the honest scale measures: ~$21.3 billion against ~$1.82 billion of trailing gross profit is roughly ~12 times, and against the ~$2.4 billion ARR figure roughly ~8.9 times. Management's own 2026 guidance is written in recurring gross profit and adjusted EBITDA for the same reason.

Headline figures (approximate, Jul 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); TOST shows revenue (ttm) ~$6.80 billion, up ~23% year over year in Q2 2026, gross profit (ttm) ~$1.82 billion, a margin near ~27%, arr (june 30, 2026) ~$2.4 billion, up ~25% year over year, net income (ttm) ~$486 million; Q2 2026 diluted EPS ~$0.26.

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