Banks are financial institutions providing a breadth of products and services, including managing deposits, lending, wealth management, currency exchange, and investment banking. These banks' customers include individual consumers, businesses, and many other types of institutional clients. The definition of a commercial bank has evolved dramatically in the past several decades. Today, large banks cater to their traditional clients, which includes individual customers and both large and small companies by offering savings and checking accounts, certificates of deposit, loans and similar services. Many of them also have businesses that operate as investment banks, and work with corporate and institutional clients by providing underwriting of stock offers, brokerage, and M&A advisory.

Below, we'll take a look at the 10 biggest banks as measured by 12-month trailing revenue. This list is limited to companies which are publicly traded in the U.S. or Canada, either directly or through ADRs. Some companies outside the U.S. report profits semi-annually instead of quarterly, so the 12-month trailing data may be older than it is for companies that report quarterly. All figures are as of March 30, 2020 and all data is provided by YCharts.﻿﻿

Some of the stocks below are only traded over-the-counter (OTC) in the U.S., not on exchanges. Trading OTC stocks often carries higher trading costs than trading stocks on exchanges. This can lower or even outweigh potential returns.

Revenue (TTM): $123.6B

Net Income (TTM): $45.3B

Market Cap: $231.8B

1-Year Trailing Total Return: -6.9%

Exchange: OTC

The largest bank in the world in terms of total assets under management (AUM) is the Industrial and Commercial Bank Of China Ltd. This institution provides credit cards and loans, financing for businesses, and money management services for companies and high net worth individuals. Though this is a commercial bank, it is state-owned.

Revenue (TTM): $114.6B

Net Income (TTM): $36.4B

Market Cap: $280.1B

1-Year Trailing Total Return: -5.8%

Exchange: New York Stock Exchange

JPMorgan Chase & Co. is a multinational bank and financial services holding company involved in corporate lending, asset management, wealth management, and investment and consumer banking, among other offerings. In response to COVID-19, JPMorgan Chase recently announced plans to seek up to $10 billion in funds from pension funds and other clients for alternative investments like leveraged loans and certain types of real estate.﻿﻿

Revenue (TTM): $112.3B

Net Income (TTM): $4.7B

Market Cap: $34.4B

1-Year Trailing Total Return: -28.3%

Exchange: OTC

Unique among many of the companies on this list, Japan Post Holdings Co. Ltd. has operations in banking as well as in life insurance, logistics, and other businesses. The company is also well-known for its Japan Post branch, which is involved in mail delivery and post office management in Japan, as well as Japan Post Bank, the company's banking branch.

Revenue (TTM): $102.2B

Net Income (TTM): $38.7B

Market Cap: $196.6B

1-Year Trailing Total Return: -3.7%

Exchange: OTC

The second Chinese bank on our 10 biggest list is China Construction Bank Corp. It provides corporate banking services such as e-banking, credit lines, and commercial loans. China Construction Bank also provides personal banking through a separate segment, offering personal loans, deposits, wealth management, and credit cards.

Revenue (TTM): $91.2B

Net Income (TTM): $27.4B

Market Cap: $188.5B

1-Year Trailing Total Return: -18.2%

Exchange New York Stock Exchange

Bank of America is a U.S. bank that offers services for individual clients and businesses of all sizes. Besides deposit and checking accounts through its Consumer Banking branch, Bank of America provides a variety of commercial and wealth management services through its Global branches as well. The company recently made headlines for offering to consider mortgage deferral requests from customers during the COVID-19 crisis. Some customers said the bank's deferral offers were misleading.﻿﻿

Revenue (TTM): $89.7B

Net Income (TTM): $30.9B

Market Cap: $131.5B

1-Year Trailing Total Return: -14.1%

Exchange: OTC

Agricultural Bank of China is state-owned institution that provides not only personal and corporate banking services, but it also offers a special suite of products for agricultural customers such as small farming operations and larger agricultural wholesale companies.

Revenue (TTM): $83.4B

Net Income (TTM): $5.4B

Market Cap: $22.3B

1-Year Trailing Total Return: -32.4%

Exchange: OTC

Credit Agricole SA, the only Europe-based bank in the 10 biggest, is the largest cooperative financial institution in the world by AUM. The company has a history of serving agricultural customers but now serves a variety of individual and business clients.

Revenue (TTM): $82.0B

Net Income (TTM): $19.6B

Market Cap: $123.8B

1-Year Trailing Total Return: -35.4%

Exchange: New York Stock Exchange

Wells Fargo offers an array of financial services for individual and corporate clients. In recent years, the company has been mired in a fake accounts scandal that hurt a larger number of the banks' individual customers, with the U.S. government recently fining Wells Fargo $3 billion as part of the ongoing proceedings.﻿﻿

Revenue (TTM): $79.4B

Net Income (TTM): $27.2B

Market Cap: $109.1B

1-Year Trailing Total Return: -12.7%

Exchange: OTC

Bank Of China focuses primarily on commercial banking activities such as deposits and withdrawals, and foreign exchange. The bank also is even licensed to issue banknotes in Hong Kong and Macau.

Revenue (TTM): $74.3B

Net Income (TTM): $19.4B

Market Cap: $91.9B

1-Year Trailing Total Return: -25.9%

Exchange: New York Stock Exchange

Citigroup is a multinational investment bank and financial services company offering securities services, institutional financial services, global retail banking, and more.