Jamie Dimon investing lessons began with his father’s stock games
JPMorgan CEO Jamie Dimon said his stockbroker father made him value companies as a child, shaping a career that led to Wall Street’s top bank.
By Daniel Okafor · Business Editor
3 min read
Jamie Dimon investing lessons began at home, where his father, Wall Street stockbroker Theodore Dimon, pushed him to think through what a business was worth. The JPMorgan Chase chief executive said on Wilfred Frost’s The Master Investor Podcast that the childhood exercises forced him to study companies before deciding what he would pay for their shares.
Dimon, now 70, said his father might choose a familiar industry, such as restaurants, and tell him to examine a company’s record, annual report and market before making a call on the stock. He described the exercise as “brutally hard” because the work did not stop at picking a price; it required understanding the reason behind the decision.
How did Jamie Dimon learn to invest?
Dimon said his father taught him by turning investing into a practical valuation game: choose an industry, study the company and decide what the stock should be worth. That method exposed him early to annual reports, industry research and the discipline of explaining an investment judgment.
According to Fortune, Theodore Dimon encouraged all three of his sons to learn about markets, but Jamie Dimon showed the strongest interest. By high school, Dimon said, he was reading about psychology, economics and accounting, including Graham and Dodd, along with Freud’s books.
Dimon bought his first stock at age 14 in 1970 with help from his father, Fortune reported. He later graduated from Tufts University and earned an MBA from Harvard Business School.
After Harvard, Dimon joined American Express as an assistant to Sanford “Sandy” Weill. In a 1984 Fortune profile, when he was 28, Dimon said his first goal was to learn and avoid speaking until he could add value.
Dimon followed Weill from American Express to Commercial Credit in 1986, according to Fortune. He became chief financial officer there at 30, then went on to senior roles tied to Citigroup and Bank One before Bank One merged with JPMorgan Chase in 2004.
Dimon became JPMorgan Chase CEO in 2006. Fortune reported that he is one of the few Wall Street chiefs from the 2008 financial crisis era still leading a major bank, with a tenure far longer than many peers, whose typical CEO runs lasted under a decade, according to Esgauge data cited by Fortune.
What has JPMorgan become under Dimon?
JPMorgan Chase is the largest bank in the United States, according to Fortune. The company ranked No. 12 on the Fortune 500 and No. 19 on the Global 500.
JPMorgan reported $185.6 billion in revenue for 2025, up $5 billion from the prior year, according to the bank’s 2025 annual report. Bloomberg’s Billionaires Index puts Dimon’s net worth at $3.2 billion.
Dimon said on the podcast that he did not assume he would build JPMorgan toward a market capitalization near $1 trillion. He said setting out to be the biggest bank in the world can cause trouble, and pointed to NFL quarterbacks Tom Brady and Peyton Manning as examples of people who became elite through discipline rather than obvious physical advantages.
At Fortune’s Most Powerful Women Summit in 2025, Dimon told Fortune editor-in-chief Allyson Shontell that he tries to give full effort in every meeting and every day. He said not every attempt succeeds, but the work requires humility and persistence.
This story draws on original reporting from Fortune.