An investment bank does not have one business. It has several, they sit under one roof for reasons that are historical and regulatory more than commercial, and almost everything confusing about the industry follows from treating them as a single thing. The way in is to ask what the bank sells and who pays for it, because every division answers that question differently and the answer decides what the job is like.
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What the bank actually sells
Strip away the names and an investment bank sells two things. The first is advice on transactions that a company does rarely and cannot afford to get wrong: buying another company, selling itself, listing its shares, refinancing its debt. The second is access to markets, meaning the ability to buy or sell a security at a sensible price at the moment you want to.
Everything on the floor descends from one of those two. The advisory side is a professional services business that happens to sit in a bank. The markets side is a trading business that happens to sit next door. They have different clients, different economics and different rhythms, and the only real thing they share is the balance sheet and the brand.
| Division | What it sells | Who pays | How it gets paid |
|---|---|---|---|
| M&A advisory | Judgement on buying and selling companies | The company, or its board | A fee on completion, sometimes with a retainer |
| Equity capital markets | Access to equity investors, and pricing | The issuing company | A percentage of the money raised |
| Debt capital markets | Access to bond investors, and structuring | The issuer | A percentage of the issue, usually smaller |
| Leveraged finance | Debt for buyouts, underwritten | Sponsors and companies | Underwriting fees, plus the risk of holding the paper |
| Sales and trading | Liquidity and execution | Institutional investors | The spread, and commission |
| Research | A view on companies and sectors | Institutional investors, separately | Explicit payment since MiFID II unbundling |
| Asset and wealth management | Management of other people’s money | Investors in the funds | A percentage of assets, annually |
Where the fee actually comes from
Advisory fees are overwhelmingly contingent. A bank advising on a sale can work for a year and be paid nothing if the deal does not complete, which is why the fee on a completed transaction looks so large relative to the hours: it is priced to cover the processes that died as well as the one that closed. A retainer, where it exists at all, is usually a small monthly amount that signals commitment rather than covering cost.
Capital markets fees work differently because there is a defined amount of money changing hands. On an initial public offering the banks take a gross spread, historically around 5% to 7% on smaller US listings and a good deal thinner on large ones, split between the syndicate. On a bond issue the percentage is far smaller, because the work is more standardised and the risk is lower.
Markets revenue is not a fee at all. A market maker quotes a price to buy and a price to sell, and the difference between them is the compensation for standing ready to trade when someone wants to. Volume matters more than any single transaction, which is why the culture, the hours and the measurement on a trading floor look nothing like the advisory floor upstairs.
League tables sit on top of all of this. They rank banks by the value of deals they advised on, and they matter because a board choosing an adviser wants evidence, which means a bank will sometimes take an unprofitable mandate to stay high in a table it will cite for the next three years.
The wall down the middle
An advisory banker knows that a listed company is about to be sold. A trader two floors down trades that company’s shares. If information passed between them, the second could trade on something the market does not know, which is the definition of the offence. So the bank is split by an information barrier: a private side that holds confidential client information and cannot trade, and a public side that trades and is not told.
This is not a matter of etiquette. Crossing the barrier is controlled by compliance, logged, and the reason an analyst is told which deals they may discuss and with whom. When someone on the public side does need to be brought inside for a specific transaction, they are formally wall-crossed and restricted from trading the name until it is public.
Research sits awkwardly in this structure and has been reorganised repeatedly because of it. A research analyst publishes a view on a company that the bank may also be advising, and the conflict is obvious enough that the two are now separated by rules on who may speak to whom and when. Since MiFID II in Europe, research also has to be paid for explicitly rather than bundled into trading commission, which shrank the industry considerably and is a large part of why research headcount is smaller than it was.
Coverage and product, which is how the advisory floor is organised
The advisory floor is cut two ways at once. Coverage groups are organised by industry: healthcare, technology, industrials, financial institutions, consumer and retail, energy. They own the client relationship, they know the sector, and they are the ones who get the call.
Product groups are organised by transaction type: mergers and acquisitions, equity capital markets, debt capital markets, leveraged finance, restructuring. They know how the transaction is done and they execute it across every sector.
A live deal usually has both, and the split matters to a candidate more than it sounds. Coverage gives you sector knowledge and client exposure; product gives you repetition on the mechanics. Buy-side recruiters lean toward people from groups where the transaction volume was high and the modelling was real, which is why M&A and leveraged finance carry a reputation, and why a quiet coverage year can matter more to your exit than the name on the door.
The tiers, and what they mean for you
Banks are usually grouped into tiers, and the grouping is informal but consistent enough to be useful. What actually differs between them is breadth of product, size of balance sheet, and the shape of the analyst experience.
| Tier | What it is | What the analyst experience tends to be |
|---|---|---|
| Bulge bracket | Full-service global banks with a balance sheet | Structured programme, large class, deep resources, narrower work |
| Elite boutique | Advisory-only firms, often M&A or restructuring specialists | Smaller class, earlier responsibility, strong buy-side placement |
| Middle market | Banks focused on smaller transactions | Broader role, more deals per person, smaller deal sizes |
| Regional and sector specialists | Firms defined by geography or one industry | Real depth in one place; less portable outside it |
Where a graduate job actually sits
Almost everything written about breaking into banking means one seat: the investment banking division analyst, on the advisory floor, doing the modelling and the materials. It is the seat with the most competition and the most written about it, and it is not the only one.
Sales and trading is a genuinely different job with a different application process, a different day and a different exit path. Research is smaller than it was and suits someone who wants to write and form views rather than execute. Risk, technology, operations and treasury are large, real careers that recruit well and are consistently under-applied to relative to their quality.
The mistake worth avoiding early is applying to a division because it was the one you had heard of. The work in these seats differs more than the titles suggest, and the honest way to choose is to ask which of them you would still want at seven in the evening on a Tuesday in your second year.
Frequently asked questions
What does an investment bank do in simple terms?
It advises companies on large one-off financial decisions and gives investors access to markets. The advisory side helps a company buy another company, sell itself, list its shares or raise debt, and is paid a fee, usually only if the transaction completes. The markets side buys and sells securities for institutional investors and is paid through the spread between its buying and selling prices. The two have different clients and different economics and are separated by an information barrier.
What is the difference between an investment bank and a commercial bank?
A commercial bank takes deposits from the public and lends that money out, making its margin on the difference between what it pays savers and what it charges borrowers. An investment bank does not take retail deposits. It advises companies and institutions on transactions and intermediates in securities markets. Many large groups contain both, separated by regulation, but the businesses are distinct: one is built on a loan book, the other on fees and trading.
How do investment banks make money?
Four ways, in descending order of how well known they are. Advisory fees on completed mergers and acquisitions, which are contingent on the deal closing. Underwriting fees on share and bond issues, taken as a percentage of the money raised. Trading revenue from the spread between the prices at which the bank buys and sells securities for clients. And recurring management fees where the group also runs asset or wealth management. Interest on lending and on the balance sheet sits underneath all of it.
What is the difference between front office, middle office and back office?
Front office is anything that faces a client or takes risk: advisory bankers, salespeople, traders, research. Middle office manages the consequences of what the front office does, including risk, compliance and product control. Back office settles and records the transactions and runs the infrastructure. The distinction shapes pay and progression, and it is less rigid than it once was, because technology and risk roles at many firms now carry responsibility and compensation that the old labels do not describe.
Do you need a finance degree to work at an investment bank?
No. Banks recruit heavily from economics, engineering, mathematics, natural sciences, law and humanities, and a large share of any analyst class studied something other than finance. What is expected is that you closed the technical gap yourself before the interview, because the accounting and valuation questions are the same regardless of what you read. A non-finance degree is a common background, not an excuse for a weak answer on the three statements.
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