Major ClientsNarrow moat

Citigroup (C) — moat facet

Citi has no dominant client, but an eighth of its revenue rests on five card contracts.

Citi serves millions of consumers and tens of thousands of institutions, and discloses one concentration. Its five largest card partnerships made up about 12% of revenue in 20251. No other client, and no Services client, is named or sized.

Where the concentration sits ($bn)934Institutional deposits, end-2025about 10.2Card partners, 2025 revenueCitigroup Form 10-K FY2025; revenue share calculated at 12% of $85.2bn
Deposits committed; card revenue concentrated.

Revenue concentration and forward commitments give different pictures, so they are checked separately. On revenue, the concentration is the card partners, whose contracts have fixed terms2. On commitments, Citi has no backlog; the nearest thing is about $934 billion of institutional deposits held by clients who have mostly banked with it for more than 15 years3.

The client base is also being reshaped. Citi is selling its consumer banks outside America; Legacy Franchises still held $47 billion of deposits in June 20264. And the institutional clients span over 90 countries5, which spreads the risk by name and exposes it to every country's politics.

The four pages below cover the card partners, the deposit base in place of a backlog, the geographic spread and the consumers Citi keeps and sells.

The quality of both client books is high. Citi's Investor Day put corporate lending exposure at $817 billion, 78% of it investment grade, with a net credit loss rate of 0.1%, and U.S. card loans at $174 billion, 85% of them to borrowers with FICO scores of 660 or more6.

The credit quality differs by client type. Corporate non-accrual loans rose 1% to $1.7 billion in the second quarter of 2026 on downgrades in Services and Banking, while consumer non-accrual loans fell 9% to $1.5 billion7.

The consumer side is growing again. U.S. card spend was $176 billion in the second quarter of 2026, up 11%, and Citi opened 5,376 thousand new card accounts, up 65%8.

The card share is the number that moves. From about 10% in 20209 to about 12% in 2025, it is rising; above 13% the consumer franchise would depend on fewer contracts than the headline diversity suggests.

Moat trajectory: Holding steady

Card partners about 12% of revenue; institutional deposits about $934bn.

The number that tests this moat
Reported
Average Services deposits vs total, latest quarter
$1,017bn of $1,504bn average deposits (Q2 2026)

How much of the funding sits with institutional clients; a falling share would mean the committed base was shrinking.

Source: Citigroup Q2 2026 earnings release ↗
Dig deeper
DIG DEEPER 01
Five Card Partners, 12% of Revenue
Five card partners bring in about an eighth of Citi's revenue, and each contract has an end date.
DIG DEEPER 02
No Backlog; the Deposits Are the Contract
Citi's clients sign no order book, but $934 billion of their cash is wired into its payment systems.
DIG DEEPER 03
Clients in Ninety Countries, and One Country Citi Left
Citi's clients are spread over ninety countries, and leaving Russia alone cost $1.2 billion.
DIG DEEPER 04
The Consumers Citi Keeps and the Ones It Sells
Citi is keeping its American cardholders and wealth clients and selling most of its consumers abroad.
References
  1. ReportedIts five largest card partnerships made up about 12% of revenue in 2025.
    Citigroup Form 10-K for fiscal 2025 - risk factors, competition, the 2020 consent orders, transformation spending and the card-partner concentration disclosure. — FY2025 · publ. 20 February 2026 · source ↗
  2. ReportedOn revenue, the concentration is the card partners, whose contracts have fixed terms.
    Citigroup Form 10-K for fiscal 2025 - risk factors, competition, the 2020 consent orders, transformation spending and the card-partner concentration disclosure. — FY2025 · publ. 20 February 2026 · source ↗
  3. ReportedOn commitments, Citi has no backlog; the nearest thing is about $934 billion of institutional deposits held by clients who have mostly banked with it for more than 15 years.
    Citigroup Form 10-K for fiscal 2025 - deposits: average balances and rates, institutional deposit composition, deposits by office and interest-rate sensitivity. — FY2025 · publ. 20 February 2026 · source ↗
  4. ReportedCiti is selling its consumer banks outside America; Legacy Franchises still held $47 billion of deposits in June 2026.
    Citigroup Form 10-Q for the quarter ended 30 June 2026 - divestitures: Banamex stake sales and CTA losses, the Russia and Poland sales, and Legacy Franchises balances. — Q2 2026 · publ. 6 August 2026 · source ↗
  5. ReportedAnd the institutional clients span over 90 countries, which spreads the risk by name and exposes it to every country's politics.
    Citigroup Form 10-K for fiscal 2025 - business description, segments, history, footprint, employees and executives. — FY2025 · publ. 20 February 2026 · source ↗
  6. ReportedCiti's Investor Day put corporate lending exposure at $817 billion, 78% of it investment grade, with a net credit loss rate of 0.1%, and U.S. card loans at $174 billion, 85% of them to borrowers with FICO scores of 660 or more.
    Citigroup 2026 Investor Day financial overview presentation - RoTCE targets, business targets for Services, Cards and Markets, efficiency ratio, transformation, liquidity and capital. — May 2026 · publ. May 2026 · source ↗
  7. ReportedCorporate non-accrual loans rose 1% to $1.7 billion in the second quarter of 2026 on downgrades in Services and Banking, while consumer non-accrual loans fell 9% to $1.5 billion.
    Citigroup second-quarter 2026 earnings release, Form 8-K exhibit 99.1 - firm results, returns, efficiency, capital returned, tangible book value and All Other. — Q2 2026 · publ. 14 July 2026 · source ↗
  8. ReportedU.S. card spend was $176 billion in the second quarter of 2026, up 11%, and Citi opened 5,376 thousand new card accounts, up 65%.
    Citigroup second-quarter 2026 earnings release, Form 8-K exhibit 99.1 - Wealth and U.S. Consumer Cards results and key metrics. — Q2 2026 · publ. 14 July 2026 · source ↗
  9. ReportedFrom about 10% in 2020 to about 12% in 2025, it is rising; above 13% the consumer franchise would depend on fewer contracts than the headline diversity suggests.
    Citigroup Form 10-K for fiscal 2020 - the five largest card relationships at approximately 10% of revenues. — FY2020 · publ. February 2021 · source ↗
Sources
Generated September 28, 2026