Jamie Dimon said insecurity can ruin CEOs. Here's how to spot a fragile ego hiding behind confidence.

Jamie Dimon Bloomberg/Getty Images The JPMorgan Chase boss warned that a lack of confidence can torpedo a CEO's career. Micromanaging, rejecting dissent, and chasing credit can weaken teams and drive away talent. Executive coaches explain how leaders can replace defensive habits with curiosity and trust. Insecure CEOs may not recognize their own behavior — or realize how much it is hurting them. Jamie Dimon recently said a lack of self-confidence can sink a leader's career by disconnecting them from what is happening inside their companies. Speaking on "The Master Investor Podcast with Wilfred Frost," the JPMorgan Chase boss recalled a saying: "When some people get a big job, some grow into it, and some swell into it." Insecurity, he explained, is what drives the swelling. Executive coaches and recruiters say recognizing insecure behavior can help leaders correct it before it damages their careers and companies.