Following are the top 5 and top 10 biggest banks in the world ranked by total assets as of September 30, 2017. With assets of US$3.9 trillion, Industrial & Commercial Bank of China (ICBC) occupies the top position in the list.

1. Industrial & Commercial Bank of China

Industrial & Commercial Bank of China (ICBC) (SEHK: 1398, SSE: 601398, OTC US: IDCBY) is the largest bank in the world by total assets and market capitalization. Established in 1984, it is one of China's Big Four state-owned commercial banks. With over 450,000 employees, ICBC serves more than 530 million personal and corporate customers through about 17,000 outlets in China and 400 offices abroad. It was named “Best Bank in China” by Global Finance and the Banker. As of September 30, 2017, the company had total assets of RMB 25.765 trillion (US$3.9 trillion), loans and advances to customers of US$2.068 trillion and shareholders’ equity of US$316 billion.

Total assets: $3.869 trillion (09/2017)
Market capitalization: $314.1 B (November 17, 2017)
Number of employees: 454,070

 Credit ratings:

  Long Term Outlook
Standard & Poor's A Stable
Moody's Investors Service A1 Stable

2. China Construction Bank

China Construction Bank Corporation (CCB) is the second largest bank in the world in terms of total assets. It was founded in 1954 and today serves over 340 million retail and corporate customers through about 15,000 local branches and outlets as well as overseas offices in London, Frankfurt, Luxembourg, New York, Barcelona, Paris, Zurich, Singapore, Dubai, Tokyo, Hong Kong, Macau, Johannesburg, Seoul, Toronto, Auckland, Sydney, Melbourne and Brisbane. CCB specializes in infrastructure projects and urban housing.

Total assets: $3.312 trillion (09/2017)
Market capitalization: $218.6 B (November 17, 2017)
Number of employees: 356,050

 Credit ratings:

  Long Term Short Term Outlook
Moody's A1 P-1 Stable
Standard & Poor's A A-1 Stable
Fitch A F1 Stable

3. Agricultural Bank of China

Agricultural Bank of China Ltd (ACB), founded in 1951, is the third largest bank in the world. It specializes in providing services to agricultural sector as well as offers personal banking, investment banking, fund management, insurance, foreign exchange and other services.

Total assets: $3.142 trillion (09/2017)
Market capitalization: $176.6 B (November 17, 2017)
Number of employees: 489,460

Credit Ratings:

  Long Term Short term Outlook
Standard & Poor's A A-1 Stable
Fitch Ratings A F1 Stable

4. Bank of China

Bank of China Ltd (BOC), established in 1912, is the fourth largest bank in the world by assets and the ninth largest bank by market capitalization. It employs over 300,000 people and operates approximately 11,000 domestic branches and outlets, more than 46,000 ATMs and 580 offices in nearly 40 countries.

Total assets: $2.917 trillion (09/2017)
Market capitalization: $164.9 B (November 17, 2017)
Number of employees: 304,490

  Long Term Short Term Outlook
Moody's A1 P-1 Stable
Standard & Poor's A A-1 Stable
Fitch A F1 Stable

5. Mitsubishi UFJ Financial

Mitsubishi UFJ Financial Group, Inc. (MUFG) (NYSE: MTU, TYO: 8306) is the largest financial group in Japan and the fifth-largest financial institution in the world by assets. Mitsubishi UFJ was created in 2005 through the merger of Mitsubishi Tokyo Financial Group and UFJ Holdings. As of September 30, 2017, MUFG had total assets of JPY 305.469 trillion (US$2.7 trillion) and deposits of JPY 171.821 trillion (US$1.527 trillion).

Total assets: $2.714 trillion (09/2017)
Market capitalization: $92.6 B (November 17, 2017)
Number of employees: 115,280

Credit ratings:

  Long Term Short Term
Moody's A1 P-1
Standard & Poor's A -
Fitch A F1

6. JPMorgan Chase & Co

Total assets: $2.563 trillion (09/2017)
Market capitalization: $340.5 B (November 17, 2017)
Number of employees: 251,500

7. BNP Paribas

Total assets: $2.547 billion (09/2017)
Market capitalization: $93.0 B (November 17, 2017)
Number of Employees: 189,000

8. HSBC Holdings

Total assets: $2.526 trillion (09/2017)
Market capitalization: $192.8 B (November 17, 2017)
Number of employees: 232,350

9. Bank of America

Total assets: $2.284 trillion (09/2017)
Market capitalization: $277.7 B (November 17, 2017)
Number of employees: 208,024

10. Wells Fargo

Total assets: $1.935 trillion (09/2017)
Market capitalization: $266.7 B (November 17, 2017)
Number of employees: 269,100