Investment banks are financial firms that help companies and governments raise money, buy and sell other companies, and trade securities for their own accounts

An investment bank is not a bank where you deposit money. It is a financial services firm that works with large organizations—corporations, governments, wealthy individuals—on major financial transactions. Unlike a retail bank that takes deposits and makes loans to consumers, an investment bank earns fees by arranging deals, underwriting securities, and trading in financial markets.

The largest investment banks operate globally and handle transactions worth billions of dollars. Some are standalone firms; others are divisions of larger financial conglomerates that also run retail banking operations. What they have in common is that their clients are institutions and high-net-worth entities, not ordinary people.

Key Takeaways

  • Investment banks earn money through fees on mergers, acquisitions, and securities underwriting, not from customer deposits.
  • The main divisions within an investment bank are corporate finance (deal advisory), capital markets (underwriting and trading), and sales and trading (buying and selling securities).
  • Investment banks differ fundamentally from retail banks, which serve individual customers and take deposits.
  • Regulation of investment banks tightened after the 2008 financial crisis, including rules that limit proprietary trading and require higher capital reserves.

The three main business lines of an investment bank

Corporate finance is the advisory side. Investment bankers in this division help companies decide whether to merge with or acquire another firm, go public through an initial public offering (IPO), or restructure their debt. They analyze the target company, value it, negotiate terms, and structure the deal. The bank earns a percentage of the transaction value as a fee—typically 1 to 2 percent on a merger or acquisition, or 3 to 7 percent on an IPO, depending on the size and complexity.

Capital markets is where the bank helps clients issue new securities. When a company needs to raise money, it can sell stock (equity) or bonds (debt). The investment bank underwrites these securities, meaning it buys them from the issuer and resells them to investors. The bank profits from the spread between what it pays the issuer and what it receives from investors. For a bond offering, this spread might be 1 to 3 percent; for stock, it varies widely.

Sales and trading is the market-facing division. Traders buy and sell stocks, bonds, currencies, commodities, and derivatives on behalf of the bank's clients and the bank itself. Salespeople maintain relationships with institutional clients—pension funds, hedge funds, mutual funds—and execute their trades. The bank earns money on the bid-ask spread (the difference between the price at which it buys and sells) and on commissions.

How investment banks differ from retail banks

A retail bank takes deposits from individuals, pays interest on savings accounts, and lends money to consumers and small businesses. Its revenue comes from the interest spread—the difference between what it pays depositors and what it charges borrowers. An investment bank does not take deposits and does not lend to individuals.

An investment bank's clients are large institutions with complex financial needs and the resources to pay substantial fees. A retail bank's clients are individuals and small businesses. The two operate in different markets, face different regulations, and make money in fundamentally different ways. Some large financial institutions operate both divisions—JPMorgan Chase, Bank of America, and Goldman Sachs all have retail and investment banking arms—but the divisions function separately.

The role of investment banks in mergers and acquisitions

When one company wants to buy another, it often hires an investment bank to advise on the deal. The bank's corporate finance team values the target company, identifies potential buyers or sellers depending on which side the bank represents, negotiates terms, and structures the transaction to minimize taxes and regulatory risk.

The investment bank may also arrange financing for the buyer. If the buyer does not have enough cash on hand, the bank may underwrite a bond offering or arrange a loan from other lenders. In a leveraged buyout, the bank helps structure a deal where the buyer uses borrowed money to finance most of the purchase price. The bank earns fees at each stage: advisory fees, underwriting fees, and arrangement fees for securing financing.

Securities underwriting and how it works

When a company decides to go public, it must issue stock and sell it to investors. The company hires an investment bank (or a group of banks) to underwrite the offering. The bank agrees to buy all the shares the company is issuing at a set price, then resells them to institutional and retail investors at a higher price.

The bank assumes the risk that it will not be able to sell all the shares at the higher price. If demand is weak, the bank may have to hold shares or sell them at a loss. If demand is strong, the bank profits handsomely. The underwriting spread—the difference between what the bank pays the issuer and what it receives from investors—is the bank's primary profit on the deal. The bank also earns advisory fees for structuring the offering and managing the process.

Proprietary trading and the limits imposed after 2008

Proprietary trading means the bank trades securities using its own money, not on behalf of clients, in hopes of making a profit. Before the 2008 financial crisis, investment banks engaged in large-scale proprietary trading, taking on substantial risk. When the housing market collapsed and financial institutions failed, regulators concluded that proprietary trading had amplified systemic risk.

The Dodd-Frank Act, passed in 2010, included the Volcker Rule, which restricts proprietary trading by banks. Banks can still trade for clients and can hold securities as inventory to facilitate client trades, but they cannot use significant amounts of capital to bet on market movements for their own profit. The rule has exceptions and is complex to enforce, but it fundamentally changed how investment banks operate. Some banks spun off proprietary trading operations or reduced them substantially.

Capital requirements and how banks stay solvent

Investment banks must maintain minimum levels of capital—cash and liquid assets—relative to their total assets and risk exposure. These requirements exist to may support the bank can absorb losses without failing and harming the broader financial system. After 2008, regulators increased capital requirements significantly.

The Federal Reserve and other regulators conduct stress tests on large banks annually, simulating severe economic downturns to see whether the bank would remain solvent. Banks that fail the test must raise more capital or reduce risk. These requirements limit how much leverage (borrowed money) a bank can use and constrain how much it can profit from risky trades. They also make it more expensive for banks to operate, which is reflected in higher fees charged to clients.

Frequently Asked Questions

Can I open an account at an investment bank?

Not in the traditional sense. Investment banks do not take deposits from individuals. Some offer wealth management services to very high-net-worth clients (typically $10 million or more in assets), but these are advisory and trading services, not deposit accounts. For banking services, you need a retail bank or credit union.

Why do investment banks charge such high fees?

Investment banking deals are complex, high-stakes transactions involving millions or billions of dollars. The bank's team of analysts, lawyers, and executives spends months on a single deal. The bank also assumes risk—in underwriting, it may hold securities it cannot sell. Fees reflect the informed, time, and risk involved. Clients negotiate fees based on deal size and complexity.

What happens if an investment bank fails?

If an investment bank becomes insolvent, it does not trigger the same insurance protection as a retail bank failure. The Federal Deposit Insurance Corporation (FDIC) insures retail deposits up to $250,000 per account, but investment bank clients—institutions and wealthy individuals—do not have this protection. During the 2008 crisis, the government intervened to prevent major investment bank failures because their collapse would have destabilized the entire financial system.

Is working at an investment bank the same as being a stockbroker?

No. A stockbroker is a licensed individual who buys and sells securities on behalf of retail clients in exchange for commissions. An investment banker works on corporate transactions, underwriting, and advisory services for institutional clients. Some investment banks employ brokers, but the roles are distinct. Brokers must pass licensing exams; investment bankers typically have MBAs and specialized training.

How do investment banks make money during a market downturn?

During downturns, deal volume typically falls, so advisory and underwriting fees decline. However, trading volumes often increase as clients reposition their portfolios, which can boost sales and trading revenue. Some banks also profit from volatility if they have positioned their trades correctly. Overall, investment banks perform worse during recessions, which is why they maintain capital reserves to weather lean periods.