3 Big Banks Are Winning Big From the AI Stock Boom

Three of Wall Street's biggest banks are making record money by helping investors bet on the artificial intelligence (AI) boom — and they're leaving their rivals far behind.

The five largest investment banks (big financial companies that help investors buy and sell stocks and raise money) earned about $67 billion from stock trading in the first nine months of this year. That's already $7 billion more than they made in all of last year.

But most of that money went to just three banks — Goldman Sachs, JPMorgan Chase, and Morgan Stanley, nicknamed the "Big Three."

Here are the key numbers:

• The Big Three earned $52 billion from stock trading so far this year
• That's nearly 80% of the industry's total
• At Goldman Sachs, income from lending money for stock bets jumped 96% in three months, hitting a record $3.37 billion

So what's driving this? Investors are rushing to buy shares in AI companies — the chipmakers, cloud providers, and data-center suppliers behind the technology. To make bigger bets, many borrow money from these banks.

A big part of the story is something called prime brokerage — a service where banks lend money and shares to hedge funds (private investment firms that make large, risky bets for wealthy clients). This lets the funds use leverage (borrowed money that boosts both potential profits and losses) to bet even bigger on AI stocks.

Why only three banks win: Only the biggest banks have enough money to absorb a possible $100 million loss on a single trade without hurting their business. Smaller banks simply can't take that risk, so they lose the business.

The banks also found a goldmine in Asia, especially South Korea and Taiwan, where investors are buying into the "picks and shovels" — the companies making the memory chips and semiconductors that power AI.

The bottom line: As long as the stock market keeps rising and AI excitement continues, these three giants look set to keep dominating — turning stock trading into one of their most reliable and profitable businesses.

This is an AI-generated summary. Read the original article at: https://www.cnbc.com/2026/10/21/goldman-sachs-jpmorgan-morgan-stanley-ai-trading.html