Investment bankers assist public and private corporations in raising funds in the capital markets (both equity and debt), as well as in providing strategic advisory services for mergers, acquisitions and other types of financial transactions.

Investment banks also act as intermediaries in trading for clients. Investment banks differ from commercial banks, which take deposits and make commercial and retail loans. In recent years, however, the lines between the two types of structures have blurred, especially as commercial banks have offered more investment banking services.

In the US, the Glass-Steagall Act, initially created in the wake of the Stock Market Crash of 1929, prohibited banks from both accepting deposits and underwriting securities; Glass-Steagall was repealed by the Gramm-Leach-Bliley Act in 1999.

Investment banks may also differ from brokerages, which in general assist in the purchase and sale of stocks, bonds, and mutual funds. However some firms operate as both brokerages and investment banks; this includes some of the best known financial services firms in the world.

Potential conflicts of interest may arise between different parts of a bank, creating the potential for financial movements that could be market manipulation. Authorities that regulate investment banking (the FSA in the United Kingdom and the SEC in the United States) require that banks impose a Chinese wall which prohibits communication between investment banking on one side and research and equities on the other.

Some of the conflicts of interest that can be found in investment banking:

Historically, equity research firms were founded and owned by investment banks. One common practice is for equity analysts to initiate coverage on a company in order to develop relationships that lead to highly profitable investment banking business. In the 1990s, many equity researchers allegedly traded positive stock ratings directly for investment banking business. On the flip side of the coin: companies would threaten to divert investment banking business to competitors unless their stock was rated favorably. Politicians acted to pass laws to criminalize such acts. Increased pressure from regulators and a series of lawsuits, settlements, and prosecutions curbed this business to a large extent following the 2001 stock market tumble.
Many investment banks also own retail brokerages. Also during the 1990s, some retail brokerages sold consumers securities which did not meet their stated risk profile. This behavior may have led to investment banking business or even sales of surplus shares during a public offering to keep public perception of the stock favorable.
Since investment banks engage heavily in trading for their own account, there is always the temptation or possibility that they might engage in some form of front running.

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