Jamie Dimon Is Competing With Everyone. He’s Not Alone

When Jamie Dimon turned to competitive threats in his shareholder letter this year, the chief executive officer of JPMorgan Chase & Co. did something unusual: He named some. Citadel Securities LLC and Revolut Ltd. were two of the firms Dimon picked out. He could also have added Apollo Global Management Inc. and even Pacific Investment Management Co.

Right now, financial firms from different disciplines are veering into each others’ lanes more freely than at any time since the 1990s. This blurring of business lines is going to accelerate with the White House push for deregulation in banking and markets. Technology, too, keeps making it easier and cheaper to strike out into new fields. For clients, that could be great news. Competition can drive down costs, make markets more efficient and benefit anyone who needs to borrow or trade. But history shows there can also be major downsides. Too much finance can be a dangerous thing when it leads to poor credit judgement, excess lending and weak risk management.

Sure, new ways of trading, lending and gathering assets — and the new companies doing these things — have been bubbling away for more than a decade. However, what was once a set of fast-moving, small and narrowly focused upstarts has been gaining critical mass and diversifying into more areas. For example, Revolut, which began as a digital foreign-currency exchange, is adding banking licenses in the UK and US and aims to increase lending as well as helping its customers trade stocks and crypto.

Or take the two best-known electronic market makers, Citadel Securities and Jane Street LLC. In 2025, the latter doubled its revenue to $40 billion, setting fresh records. More surprising was that it overtook the biggest trading desks on Wall Street, led by JPMorgan, which made $36 billion in stock and bond markets last year. But the core business of using computers to quickly and cheaply match buy and sell orders in stocks and ETFs is only part of what has driven Jane Street’s extremely rapid growth — and banks are only one of its competitors.

It borrows from big investment banks like Goldman Sachs Group Inc. to juice the returns on its own proprietary market bets, where it is up against major hedge funds. Another portion of its knock-out results comes from the soaring values of investments it has made in successful tech companies, like Anthropic PBC and CoreWeave Inc. So it’s competing with venture capital, too.

Citadel Securities, meanwhile, is rivaling banks in more traditional ways. One of those is to depart from high-speed market making and build more human relationships with big, traditional fund managers to help them sell large stakes in companies through block trades. The firm is betting that its intelligence on retail investors through its electronic trading business will help it sell shares on behalf of those fund managers more efficiently than the traditional banks can. It aims to steal some clients and market share.