Investment banks help large companies and governments raise money and buy or sell other businesses

An investment bank is a financial firm that works with corporations, governments, and wealthy individuals on large transactions — not with regular people saving for retirement. They do not take deposits like a commercial bank does. Instead, they earn money by advising on deals, arranging financing, and trading securities on their own account.

The work falls into a few main categories: helping clients raise capital (money), advising on mergers and acquisitions, trading bonds and stocks, and managing investment portfolios for institutions. A homeowner or small investor will never directly hire an investment bank, but you may own shares in companies that use them.

Key Takeaways

  • Investment banks earn fees by advising companies on raising money, buying other companies, or selling divisions.
  • They arrange loans and bond sales for large borrowers who cannot walk into a regular bank and ask for a loan.
  • They trade securities (stocks and bonds) for their own profit and for clients, which is how they generate revenue on market movements.
  • Investment banking is separate from wealth management and retail banking, though large financial firms often do all three.

How investment banks raise capital for corporations

When a large company needs to borrow money or raise cash by selling ownership stakes, an investment bank structures the deal and finds the buyers. If a company wants to go public (sell shares to the public for the first time), the investment bank runs the initial public offering, or IPO. They price the shares, market them to institutional investors, and handle the paperwork with regulators.

For bond sales, the investment bank underwrites the offering — meaning they may provide they will buy any bonds the market does not absorb, then resell them. This may provide lets the company know exactly how much money it will raise. The bank earns a fee (typically 1 to 3 percent of the total raised) whether the bonds sell easily or not.

A company might also borrow directly from an investment bank or a syndicate of banks. The bank arranges the loan, finds other lenders to share the risk, and earns fees for structuring and managing the deal. These loans often come with conditions tied to the company's financial performance.

Mergers and acquisitions advisory

When one company wants to buy another, or when a private equity firm wants to acquire a business, investment banks advise both sides. They value the target company, identify potential buyers or sellers, negotiate terms, and structure the deal to minimize taxes and regulatory risk.

The advising bank earns a percentage of the deal value — often 0.5 to 1 percent for very large transactions. On a $1 billion acquisition, that can mean $5 to $10 million in fees. Because the fee grows with the deal size, investment banks have an incentive to push for larger transactions, which critics say can lead to bad advice.

Investment banks also help companies defend against hostile takeovers by finding alternative buyers, restructuring the company to make it less attractive, or advising on legal tactics. This defensive work also generates fees.

Trading and market-making

Investment banks trade stocks, bonds, currencies, and derivatives (complex financial contracts) for two reasons: to make money for themselves and to provide liquidity to clients who want to buy or sell quickly.

When you sell a stock through your brokerage, a market-maker (often an investment bank) on the other side buys it from you at a slightly lower price than they immediately resell it for. That tiny spread — the difference between the buy and sell price — is their profit. Multiply that across millions of trades per day and it adds up to significant revenue.

Investment banks also trade on their own account, betting that a stock will rise or fall, that interest rates will move, or that one currency will strengthen against another. This proprietary trading can generate huge profits in good years and large losses in bad ones. The 2008 financial crisis partly resulted from investment banks taking excessive risks with their own capital.

Managing money for institutions and wealthy clients

The wealth management division of an investment bank handles investment portfolios for pension funds, university endowments, insurance companies, and ultra-high-net-worth individuals. They charge a percentage of assets under management (typically 0.5 to 1 percent per year) and may also charge performance fees if they beat a benchmark.

This business is more stable than trading or advisory work because the fees are predictable and recurring. However, it requires the bank to deliver returns that justify the fees, which is difficult in flat or declining markets.

The difference between investment banks and commercial banks

A commercial bank takes deposits from individuals and businesses, pays interest on savings accounts, and lends that money out as mortgages and business loans. An investment bank does not take deposits and does not lend to individuals or small businesses. They work exclusively with large institutions and wealthy clients on complex transactions.

After the 2008 financial crisis, U.S. law (the Dodd-Frank Act) required large banks to separate their investment banking and commercial banking operations to some degree, though most major banks still own both divisions. The separation was meant to prevent investment banks from taking excessive risks with depositors' money.

Some firms are pure investment banks (Goldman Sachs, Morgan Stanley after 2008) while others are universal banks that do both (JPMorgan Chase, Bank of America). The universal model lets banks cross-sell services and share client relationships, but it also concentrates risk.

How investment banks make money in different market conditions

Investment bank revenue is highly cyclical. In bull markets (when stocks are rising), trading volume increases, companies want to raise capital, and mergers happen more frequently. All three revenue streams — advisory fees, underwriting fees, and trading profits — grow together.

In bear markets or recessions, companies stop raising capital, deal volume collapses, and trading becomes volatile and risky. Investment banks often respond by cutting costs (laying off staff) and tightening risk controls. Some years an investment bank might earn $10 billion in profit; other years they might break even or lose money.

This volatility is why investment banking jobs are high-paying but unstable. Analysts and associates earn six figures in good years but face layoffs in downturns. Senior partners and managing directors have more stable compensation because they own equity in the firm.

Why investment banks matter to regular investors

You may never directly interact with an investment bank, but they shape the companies you own stock in and the bonds you might buy. When an investment bank advises a company to acquire a competitor, that deal affects the company's stock price and your portfolio. When they underwrite a bond offering, they determine how much interest the company pays, which affects its profitability.

Investment banks also influence market prices through their trading activity. Large trades by major banks can move stock and bond prices, which affects returns for all investors. During crises, when investment banks stop trading or withdraw liquidity, markets can freeze and prices can gap sharply.

Frequently Asked Questions

Do I need an investment bank to invest in stocks or bonds?

No. You can buy stocks and bonds through a retail brokerage (Fidelity, Vanguard, Charles Schwab) without ever dealing with an investment bank. Investment banks work with institutions and large corporations, not individual investors. Your brokerage may use an investment bank as a market-maker behind the scenes, but you will not see that.

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

No. A financial advisor helps individuals plan for retirement and manage personal wealth. Investment bankers advise corporations and governments on billion-dollar transactions. The skills, clients, and work environment are completely different. Some investment banks have wealth management divisions that employ advisors, but that is a separate business line.

Why do investment banks charge such high fees?

Investment banks charge high fees because they take on risk, employ highly skilled staff, and often may provide outcomes (like underwriting a bond sale). A 1 percent fee on a $1 billion deal sounds small until you realize the bank may spend months on the work and could lose money if the deal falls apart or markets move against them.

What happened to investment banks during the 2008 financial crisis?

Several major investment banks failed or were forced to merge. Lehman Brothers collapsed entirely. Bear Stearns and Merrill Lynch were sold to other banks. The crisis happened partly because investment banks took excessive risks with borrowed money and held too many mortgage-backed securities that lost value when housing prices fell.

Can investment banks go bankrupt?

Yes. Investment banks are not insured by the FDIC (which protects bank deposits up to $250,000). If an investment bank loses money faster than it can raise capital, it can fail. This is why regulators now require large banks to hold more capital and conduct stress tests to ensure they can survive a severe downturn.