Following are the top 10 credit card issuers in the U.S. in terms of purchase volume. American Express (or Amex) is the largest credit card lender nationwide with over $670 billion in credit card payments. As of November 15, 2017, the company had a market capitalization of $81 billion.
Top 10 Credit Card Issuers
| Rank | Company | Purchase Volume (US$b), 2016 |
| 1 | American Express | $674.70 |
| 2 | JP Morgan Chase | $588.60 |
| 3 | Bank of America | $311.29 |
| 4 | Citibank | $288.57 |
| 5 | Capital One | $240.85 |
| 6 | U.S. Bancorp | $122.45 |
| 7 | Discover | $121.42 |
| 8 | Wells Fargo | $118.70 |
| 9 | Barclays | $70.51 |
| 10 | Synchrony | $47.45 |
| 11 | USAA | $41.50 |
Top Issuers of U.S. general purpose credit cards
| Rank | Issuer | Outstandings (US$b), 2016 |
| 1 | Chase | $141.80 |
| 2 | Bank of America | $101.60 |
| 3 | Citibank | $94.50 |
| 4 | American Express | $92.43 |
| 5 | Capital One | $90.43 |
| 6 | Discover | $61.52 |
| 7 | Wells Fargo | $38.83 |
| 8 | U.S. Bank | $37.16 |
| 9 | Barclays | $26.35 |
| 10 | Synchrony Financial | $20.46 |
(Source: Nilson Report, 2017)
Number of Credit Cards in Circulation
There are approx. 640 million credit cards in circulation in the United States from the four leading credit card networks.
| Rank | Credit Card Network | Cards in circulation, 2015 | Market share |
| 1 | Visa | 329 million | 51.8% |
| 2 | MasterCard | 192 million | 30.2% |
| 3 | American Express | 58 million | 9.1% |
| 4 | Discover | 57 million | 9.0% |
Purchase Transactions Worldwide
| Rank | Brand | US$ billion, 2015 | Market share |
| 1 | Visa | $126.1 | 56% |
| 2 | MasterCard | $59.7 | 26% |
| 3 | UnionPay | $29.0 | 13% |
| 4 | American Express | $7.3 | 3% |
| 5 | JCB | $2.8 | 1% |
| 6 | Diners/Discover | $2.2 | 1% |
Note: Purchase transactions include commercial and consumer credit, debit and prepaid cards.
Top Credit Card Issuers in China
| Rank | Issuer | Outstandings (US$b), 2014 |
| 1 | ICBC | $59.6 |
| 2 | China Construction Bank | $53.5 |
| 3 | Bank of China | $43.6 |
| 4 | Agricultural Bank of China | $36.3 |
| 5 | China Merchants Bank | $35.7 |
| 6 | Bank of Communications | $27.4 |
| 7 | China Minsheng | $27.4 |
Top Credit Card Lenders in Brazil
Itau Unibanco
Banco do Brasil
Banco Bradesco
Banco Santander
Caixa Economica Federal
HSBC Brazil
Alelo Brasil
Citibank Brazil
Votorantim
Banco BMG
Banrisul
Banco Pan (formerly PanAmericano)