Wall Street’s Biggest Banks Are Cashing In on the AI Trade. Here’s What Investors Should Know

Wall Street's biggest banks are making a fortune from stock trading, but the profits aren't being shared equally. Goldman SachsGS, JPMorgan ChaseJPM, and Morgan StanleyMS are pulling ahead of their rivals, helped by growing demand from hedge funds and the AI-fueled stock rally. For investors, the gap between the biggest trading operations and everyone else is becoming harder to ignore.

Three banks take the lead

The five largest investment banks generated roughly $67B in equities trading revenue through September, already $7B more than their record total for all of 2025, according to CNBC. Goldman, JPMorgan, and Morgan Stanley accounted for $52B of that amount, or nearly 80%.

Their third-quarter results showed just how much business they're capturing. Goldman brought in $6.44B from equities, while Morgan Stanley's revenue rose 41% to $5.8B. JPMorgan wasn't far behind at $5B, a 49% increase driven partly by prime brokerage and derivatives.

The growth is impressive on its own, but what's driving it matters even more. Much of the money is coming from a business where smaller banks have a difficult time competing.

Hedge funds are driving profits

Prime brokerage has become one of Wall Street's biggest money makers. Banks provide hedge funds with financing, lend securities, and handle their trades, earning revenue as those clients borrow and trade more.

Goldman's equities financing revenue nearly doubled in the third quarter, climbing 96% to a record $3.37B. JPMorgan and Morgan Stanley also benefited from stronger demand for those services, according to CNBC.

The advantage comes down largely to scale. Banks need substantial capital to finance large hedge funds, and the biggest firms can take on exposures that smaller competitors may struggle to accommodate.

Demand has also benefited from the AI stock rally and more favorable capital requirements. JPMorgan CFO Jeremy Barnum described appetite for financing as "insatiable," underscoring how much business is flowing toward the largest providers.

Bond trading loses its shine

The strength in equities stands in contrast to a less impressive performance from fixed income. Morgan Stanley's bond trading revenue declined 7% to $2.01B, while Goldman's fixed-income, currencies, and commodities business generated $3.47B, well below its equities revenue.

The divide is also visible at competing banks. CitigroupC reported 14% growth in equities trading and 4% growth in fixed income, but its overall markets revenue of $6.11B was 13% lower than the previous quarter, according to Reuters.

That leaves the biggest prime brokers with an advantage that extends beyond a strong quarter. Their ability to finance major hedge fund clients gives them a larger share of the business, making it increasingly difficult for smaller competitors to close the gap.

How to position for the concentration

For investors seeking exposure to capital markets, Goldman, Morgan Stanley, and JPMorgan have the stronger case for an overweight position. Their established prime brokerage operations put them in a better position to benefit from hedge fund financing demand, while Citigroup and Bank of AmericaBAC face tougher competition for that business.

But the current pace of growth may be difficult to sustain. The five largest banks generated $114B in capital markets revenue during the first half of 2026, up 31.5%. Even JPMorgan's Barnum acknowledged that repeating those results would be difficult.

There's also the risk of a reversal in the AI trade. With hedge fund assets estimated at $13T by the IMF, according to CNBC, rising leverage and crowded positions could become a problem if markets turn sharply lower.

For now, Wall Street's trading boom is rewarding the banks with the capital to finance it. Whether that advantage holds will depend on how long hedge funds can keep the money flowing.