How Investment Banks Actually Make Money
The Hollywood Version vs. Reality
In 2024, Goldman Sachs made over $53 billion in revenue.
Most people assume that money came from trading stocks,
but it did not; less than half of it did.
The biggest, steadiest, and most boring-sounding chunk
came from things like advising on mergers
and managing rich people’s money.
This fact explains almost everything about
how investment banks actually make their fortune.
If you have ever pictured an investment bank as a room full
of people in suits yelling while staring at red and green screens,
that is the Hollywood version.
It exists, but it is not where the real money is made.
That idea comes straight from movies like
The Wolf of Wall Street,
which offer exciting stories but a misleading picture.
Investment banks barely trade with their own money anymore.
After the 2008 financial crisis, regulators cracked down hard
on banks making big speculative bets,
especially in the United States with the Volcker Rule.
Today, when an investment bank trades,
it is almost always on behalf of a client,
such as a pension fund, a corporation, or an asset manager.
They are not betting their own cash on where the market goes next.
Instead of gambling, four real engines drive the money.
Engine 1: M&A Advisory
This is the classic investment banker job.
When one company buys another, a bank gets hired
to manage the entire process, including valuing the target,
negotiating terms, structuring the deal so it does not fail from
a tax or legal standpoint, and guiding the client through months
of tense back-and-forth negotiations.
The fee is not flat; it is a percentage of the deal size,
and the percentage shrinks as the deal gets bigger.
For a small deal under $10 million, advisers might charge 5% to 10%.
For billion-dollar-plus mega-deals,
that drops to roughly 0.5% to 1.5%.
While that sounds tiny, 1% of a billion dollars is $10 million
for advising on a single deal over a few months.
The bank often does not stop there.
If the buyer needs to borrow money to fund the purchase,
the same bank usually arranges that financing
and earns a separate fee for it. This is a winner-takes-all business.
Once a bank has advised a company on one major deal,
it usually gets hired for the next one.
This is why the same handful of names show up repeatedly
on the biggest deals in the world.
Goldman Sachs, for instance, ranked number one globally in
announced and completed mergers and acquisitions in 2025.
Engine 2: Underwriting
This is what happens when a company wants to raise money,
either by selling stock to the public for the first time,
which is called an Initial Public Offering (IPO),
or by issuing bonds to borrow from investors.
When a company goes public, the bank often does not just
help sell the shares; it actually buys them from the company
first at an agreed price, then resells them to investors.
If the resale goes well, the bank profits off the spread.
If it goes badly, the bank can get stuck holding shares nobody wants,
which puts real risk on its own balance sheet.
For taking on that risk and doing the work,
banks typically earn 3% to 7% of the amount raised for an IPO,
and usually under 2% for bond issuances,
since bonds are considered safer and more standardized.
A notable example occurred with SpaceX on June 12th, 2026,
when it went public on the NASDAQ at $135 a share,
raising around $75 billion.
This was the largest IPO in history,
valuing the company at roughly $1.75 trillion.
Ten banks shared the underwriting job,
led by Goldman Sachs and Morgan Stanley, with JPMorgan,
Citigroup, Barclays, and UBS rounding out the syndicate.
Engine 3: Trading and Market Making
Modern investment banks mostly do not bet their own money
on whether stocks go up or down.
What they are doing is called market making.
Think of it like a currency exchange booth at an airport:
you are not predicting whether the dollar rises tomorrow;
you are just always ready to buy or sell,
and you profit from the small gap between the buying price
and the selling price.
When a pension fund needs to sell $500 million of stock
without crashing the price, it calls a bank,
and the bank’s trading desk handles it.
The bank profits from that tiny spread and the fees attached,
not from a directional bet.
This is a volume business with small margins but enormous scale.
At Goldman Sachs, the division covering trading,
market making, and investment banking fees combined generated
almost $35 billion in 2024, with record results specifically in equities.
Engine 4: Asset and Wealth Management
This is the least flashy and arguably the smartest model
of the four because it is recurring.
When a bank manages money for wealthy individuals,
pension funds, or institutions, it typically charges an annual fee,
usually 0.5% to 1% of total assets every year,
regardless of whether the market goes up or down.
This matters enormously because mergers
and acquisitions fees are one-time events.
The deal closes, the bank gets paid,
and then it has to find the next deal.
Wealth management fees, however,
show up year after year like a subscription.
Goldman Sachs’ asset and wealth management division
alone brought in over $16 billion in 2024,
managing assets that had grown to over $3 trillion.
Understanding the Scale and the Moat
To make these billions concrete, imagine a company gets
acquired for $10 billion.
The advising bank might charge around 0.75%
for a mega-deal of that size, which equals $75 million
for one transaction wrapped up within 6 to 12 months.
With the median annual salary in the United States being
roughly $60,000, that single deal fee equals more than 1,200 years
of an average person’s salary,
earned by a team of maybe 20 to 40 bankers.
While outsiders often assume bankers are simply overpaid
for doing paperwork, this business generates fees at that scale
because of barriers that are incredibly difficult to replicate:
- Relationships: CEOs and CFOs do not hire a random bank off a search engine for a $10 billion deal. They call the banker who has known their company for 15 years and whom they trust to keep secrets during sensitive negotiations.
- Distribution: When a company wants to sell $2 billion of new stock, someone has to actually find buyers willing to write enormous checks quickly. Big banks have direct relationships with thousands of institutional investors.
- Balance Sheet: For underwriting, the bank sometimes has to buy the shares first with its own money before reselling them. This requires tens of billions of dollars in capital sitting around ready to absorb risk.
- Trust: When a company is about to make the biggest financial decision in its history, it wants an adviser with a track record of confidentiality and competence, not the lowest bidder. A single leak or botched IPO can destroy that trust overnight.
Together, relationships, distribution, balance sheet,
and trust form a business moat that is almost impossible
to disrupt with a clever app or a smaller fee.
Distinguishing Key Financial Institutions
People often throw around terms like
investment bank, hedge fund, and commercial bank as if they
are the same thing, but they are fundamentally different:
- Commercial Bank: This is the retail bank where individuals have accounts. It takes deposits, pays a little interest, and lends that money out as mortgages and car loans.
- Hedge Fund: This is a private investment firm that takes money from wealthy investors and institutions and tries to generate returns by actively betting on markets. This is closer to the speculative trading image most people have.
- Investment Bank: This institution acts as a facilitator for deals, fundraising, trading flows, and managing institutional or wealthy clients’ money. It does not focus on retail deposits or speculative betting as its core business.
While some firms blend a commercial bank
and an investment bank under one roof,
the activities remain fundamentally distinct.
Understanding these divisions helps clarify that
when people criticize banks for reckless gambling,
they are often describing hedge fund behavior
or pre-2008 trading practices that no longer exist in the same form.
