Major ClientsNarrow moat

Mastercard (MA) — moat facet

Mastercard's five largest banks have been about a fifth of its revenue for a decade, and it does not disclose how long its network contracts with them run.

Mastercard's customers are banks, not the people who carry its cards. The issuers and acquirers pay the assessments and fees, receive the rebates, and decide which network their cards run on. The account holders and merchants are the reason the network is valuable, but they are not the ones who sign.

Five largest customers, share of net revenue (%)232017222020212022222023222024212025Mastercard Forms 10-K FY2017-FY2025
A fifth of revenue from five banks, year after year.

Revenue concentration is moderate and has barely moved in a decade. Mastercard had no individual customer that generated more than 10% of net revenue in 2025, 2024 or 20231, but its five largest customers produced about $6.9 billion, or 21%2. The share was 23% in 20173, 22% in 20204 and 22% in 20245. A handful of very large banks decide where hundreds of millions of cards sit.

Backlog concentration has to be judged separately, and here the disclosure is thin. Mastercard says its contracts for payment network services are generally up to 10 years long, and it uses the optional exemption not to disclose remaining performance obligations on them6. For value-added services it discloses $2.0 billion of unsatisfied performance obligations expected to be recognised through 20307. So the long-term commitments that matter most, the network contracts, are not measured anywhere a reader can see.

Geographically the customer base is broad. The United States was about 29% of net revenue in 20258, and Asia Pacific, Europe, the Middle East and Africa together $18,747 million against $14,044 million from the Americas9.

The 2026 Capital One migration showed how a single large customer can move growth: American debit growth of 1% reported against 8% underlying10.

Watch the five-customer share. It has held between 21% and 23% since 2017; a rise would mean bank consolidation is concentrating the buyers, and a buyer with more of Mastercard's revenue can demand more of its rebates.

Moat trajectory: Holding steady

Five-customer share steady at 21-23% since 2017.

The number that tests this moat
Reported
Five largest customers' share of net revenue
21% (2025, about $6.9bn); 22% in 2024

Concentration among the banks that choose the network; a rise would give them more leverage over rebates.

Source: Mastercard Form 10-K, FY2025 ↗
Dig deeper
DIG DEEPER 01
Five Banks, a Fifth of the Revenue
Mastercard's top five banks bring in $6.9 billion a year and have been about a fifth of its revenue since 2017.
DIG DEEPER 02
Contracts of Ten Years and a Backlog Nobody Sees
Mastercard's network contracts run up to ten years, but it does not disclose what they are worth or when they end.
DIG DEEPER 03
Seventy-One Percent Outside America
More than 70% of Mastercard's revenue comes from outside the United States, where it grows faster and competes on better terms.
DIG DEEPER 04
Merchants: The Side That Pays and Never Chooses
Merchants pay for Mastercard's network, have no say in which network is used, and have been suing about it since 2005.
References
  1. ReportedMastercard had no individual customer that generated more than 10% of net revenue in 2025, 2024 or 2023, but its five largest customers produced about $6.9 billion, or 21%.
    Mastercard Form 10-K for fiscal 2025 - Item 7 MD&A: net revenue by category, key metrics, rebates, geography and the five largest customers. — FY2025 · publ. 11 February 2026 · source ↗
  2. ReportedMastercard had no individual customer that generated more than 10% of net revenue in 2025, 2024 or 2023, but its five largest customers produced about $6.9 billion, or 21%.
    Mastercard Form 10-K for fiscal 2025 - Item 7 MD&A: net revenue by category, key metrics, rebates, geography and the five largest customers. — FY2025 · publ. 11 February 2026 · source ↗
  3. ReportedThe share was 23% in 2017, 22% in 2020 and 22% in 2024.
    Mastercard Form 10-K for fiscal 2017 - gross revenue and rebates for 2015-2017, net income and EPS, headcount and the 2017 tax charge. — FY2017 · publ. February 2018 · source ↗
  4. ReportedThe share was 23% in 2017, 22% in 2020 and 22% in 2024.
    Mastercard Form 10-K for fiscal 2020 - gross revenue and rebates for 2018-2020, the 2020 decline, the Finicity acquisition and the European Commission fine. — FY2020 · publ. February 2021 · source ↗
  5. ReportedThe share was 23% in 2017, 22% in 2020 and 22% in 2024.
    Mastercard Form 10-K for fiscal 2024 - net revenue categories recast for 2022-2024, rebates of $17,629 million, the five largest customers and the Recorded Future acquisition. — FY2024 · publ. February 2025 · source ↗
  6. ReportedMastercard says its contracts for payment network services are generally up to 10 years long, and it uses the optional exemption not to disclose remaining performance obligations on them.
    Mastercard Form 10-K for fiscal 2025 - Item 7 MD&A: value-added services and solutions. — FY2025 · publ. 11 February 2026 · source ↗
  7. ReportedFor value-added services it discloses $2.0 billion of unsatisfied performance obligations expected to be recognised through 2030.
    Mastercard Form 10-K for fiscal 2025 - Item 7 MD&A: value-added services and solutions. — FY2025 · publ. 11 February 2026 · source ↗
  8. ReportedThe United States was about 29% of net revenue in 2025, and Asia Pacific, Europe, the Middle East and Africa together $18,747 million against $14,044 million from the Americas.
    Mastercard Form 10-K for fiscal 2025 - Item 7 MD&A: net revenue by category, key metrics, rebates, geography and the five largest customers. — FY2025 · publ. 11 February 2026 · source ↗
  9. ReportedThe United States was about 29% of net revenue in 2025, and Asia Pacific, Europe, the Middle East and Africa together $18,747 million against $14,044 million from the Americas.
    Mastercard Form 10-K for fiscal 2025 - Item 7 MD&A: net revenue by category, key metrics, rebates, geography and the five largest customers. — FY2025 · publ. 11 February 2026 · source ↗
  10. ReportedThe 2026 Capital One migration showed how a single large customer can move growth: American debit growth of 1% reported against 8% underlying.
    Yahoo Finance / GuruFocus, Mastercard Q2 2026 earnings call highlights (third-party summary of the call). — Q2 2026 · publ. 31 July 2026 · source ↗
Sources
Generated September 25, 2026