FISV vs MQ: 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 MQ 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 MQ 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

Marqeta operates a modern card-issuing and payments platform that lets companies create, configure, and manage payment cards through APIs, plus process the resulting transactions. Instead of building card infrastructure from scratch, businesses like digital banks, on-demand delivery services, expense-management firms, and buy-now-pay-later providers plug into Marqeta to launch branded physical and virtual cards and embed financial features into their apps. The company reports on a net revenue basis and tracks Total Processing Volume (TPV) as a core demand metric. In Q1 2026 it reported net revenue of about $160 million on TPV of roughly $112 billion, the second straight quarter above $100 billion, and reached quarterly GAAP profitability for the first time, a milestone after years of losses.

Full MQ 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.
• MQ drivers: Embedded finance and card issuing; Diversifying beyond Block.

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 MQ, the dominant risk is customer concentration: Block (Cash App) has historically accounted for a large share of net revenue (recently in the mid-40s percent range), so any slowdown, in-housing, or renegotiation at Block hits Marqeta hard.

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; MQ 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 MQ 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.

MQ. These figures are qualitative and tied to the asOf date; verify live numbers, guidance, and the latest quarter before acting. Because Marqeta only recently turned GAAP-profitable, traditional earnings multiples are less meaningful than the trajectory of net revenue, processing volume, and margins. The story hinges heavily on Block concentration and the pace of diversification, so watch the Block revenue share, non-Block growth, and management's commentary on the pricing tier and Cash App issuance more than any single quarter's headline number.

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); MQ shows net revenue Q1 2026 net revenue was roughly $160 million, around 19% growth; Marqeta reports on a net revenue basis rather than gross, total processing volume (tpv) About $112 billion in Q1 2026, up roughly 33% and the second straight quarter above $100 billion, profitability Reached quarterly GAAP profitability for the first time in Q1 2026; full-year GAAP net income guidance was raised modestly, customer concentration Block (Cash App) has historically been a large share of net revenue (recently around the mid-40s percent); non-Block revenue is growing faster.

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