Jamie Dimon, the CEO of JPMorgan Chase, is sounding the alarm bell, warning investors that he is starting to see some similarities between today’s financial landscape and the lead-up to the 2008 financial crisis, nearly 20 years ago.

“Unfortunately, we did see this in ’05, ’06, ’07, almost the same thing,” Dimon said at the firm’s annual investor day in New York on Monday. “The rising tide lifting all boats, everyone was making a lot of money, people leveraging to the hilt. The sky was the limit.”

“I don’t know how long it’s going to be great for everybody,” he explained. “I see a couple of people doing some dumb........

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