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Investment Bank

An investment bank is a financial firm that helps companies, governments and institutions raise money and complete large transactions, rather than taking deposits from the public. Its core services are underwriting new share and bond issues, advising on mergers and acquisitions, and trading securities for clients and sometimes its own account.

It earns fees and trading spreads rather than the interest margin a high street bank relies on.

From the Money Master HQ dictionary, founded by Shihan Sheriff (FCMA, VP of Finance at Nomod, CFO at Esanjo Ventures). How these definitions are written.

What it means

The simplest way to picture an investment bank is as an intermediary between organisations that need capital and investors who have it. When a company wants $240,000,000 to expand, the bank structures the offering, prices it, finds the buyers and takes a fee for making the whole thing happen.

Most large firms are organised into a few recognisable divisions. Investment banking covers advisory and capital raising, markets covers sales and trading, research produces analysis on companies and sectors, and asset or wealth management looks after client money.

Underwriting is where the bank takes real risk. In a firm commitment deal it buys the entire issue from the company at an agreed price and resells it to investors, so if demand disappoints the bank is left holding stock it paid for.

The industry is layered. Bulge bracket firms handle the largest global mandates, middle-market banks serve mid-sized companies, and boutiques focus on advisory in specific sectors without the trading and lending operations that need heavy balance sheets.

Regulation reshaped the sector after 2008, raising capital requirements and restricting how much banks can trade with their own money. Several large firms converted to bank holding companies as a result, which brought them tighter oversight in exchange for access to central bank support.

In practice

Real-world examples.

1

Example

A family-owned manufacturer hires an investment bank to run a sale process. The bank prepares the marketing materials, approaches 40 potential buyers, manages the auction and negotiates the final terms of a $310,000,000 sale to a private equity firm.

2

Example

A national government mandates three banks to place a $2,000,000,000 ten-year bond. The banks gauge demand from pension funds and insurers, set the coupon accordingly, and distribute the paper across international investors.

3

Example

A mid-sized retailer needs $80,000,000 quickly and uses its bank to arrange an accelerated share placing overnight. Institutional investors are approached after the market closes and the new shares are priced at a 5% discount before trading reopens.

Formula

Calculation

Gross proceeds = shares issued x offer price Underwriting fee (gross spread) = gross proceeds x spread percentage Net proceeds to issuer = gross proceeds - underwriting fee A technology company lists on the public market by issuing 10,000,000 new shares at an offer price of $24.00. Gross proceeds are 10,000,000 x $24.00 = $240,000,000. The underwriting syndicate charges a gross spread of 6%, which is typical for a mid-sized initial public offering. The fee is $240,000,000 x 0.06 = $14,400,000, split between the lead bank and the other syndicate members. Net proceeds to the company are $240,000,000 - $14,400,000 = $225,600,000, before legal, accounting and listing costs. If the shares close their first day at $30.00, the $60,000,000 difference between the offer price and the market price is value that went to the initial buyers rather than the issuer, which is why pricing discipline matters as much as the fee.

Case study

Seen in the real world.

The following is an illustrative and entirely fictional example. Vessley Robotics, an invented industrial technology company, decided to go public and shortlisted two banks. One proposed a $28.00 offer price on 10,000,000 shares with a 5% spread; the other, more cautious, proposed $24.00 with a 6% spread and a wider marketing effort among long-term institutional buyers.

The founders initially favoured the higher price until the second bank walked them through the arithmetic of a failed listing. At $24.00 the gross proceeds were $240,000,000, the fee was $14,400,000 and the company netted $225,600,000, with a book covered several times over and a realistic prospect of trading up.

In this fictional case the shares opened at $30.00 and settled near $29.00 after a month. The founders privately calculated the $60,000,000 of first-day gain that had gone to investors rather than the company, but the illustrative lesson their board drew was that a stable share price and a satisfied investor base had made the follow-on raise eighteen months later straightforward.

Watch out

Common mistakes.

  • Assuming an investment bank is somewhere you can open an account, when these firms serve companies and institutions rather than retail depositors.
  • Treating the underwriting spread as the entire cost of going public, when legal, audit, listing and ongoing compliance costs add substantially to the total.
  • Believing the bank is a neutral adviser in every situation, when it may simultaneously be underwriting, lending and trading in the same securities.

Questions

People also ask.

How do investment banks make money?

Mainly through advisory fees on transactions, underwriting spreads on new issues, and the spread between buying and selling prices in their trading operations.

What is the difference between an investment bank and a commercial bank?

A commercial bank takes deposits and makes loans, earning an interest margin, while an investment bank raises capital and advises on transactions, earning fees.

What are Chinese walls?

Internal information barriers that stop confidential deal knowledge in the advisory teams reaching the trading and research staff who could misuse it.

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From the founder's library

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Last updated · October 8, 2026
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Disclaimer

The information provided in this finance dictionary is for educational and informational purposes only. It should not be construed as financial, investment, legal, or tax advice. Always consult with a qualified professional before making any financial decisions. Money Master HQ makes no representations or warranties about the accuracy, completeness, or suitability of this information. Use of this content is at your own risk.