TOP 100 | LEADERS

Title: Chief Executive Officer Company: UnitedHealth Group Industry: Healthcare / Insurance

Stephen Hemsley built UnitedHealth into a healthcare conglomerate across an 11-year first stint as CEO from 2006 before stepping into the chairman’ s role in 2017. He returned to the top job in May 2025, drawing on decades of institutional knowledge to steer the company forward once again.

Title: Chief Executive Officer Company: Berkshire Hathaway Industry: Conglomerate / Investment Holding

Greg Abel built his reputation running Berkshire Hathaway Energy before overseeing BNSF Railway and See’ s Candies among dozens of other operating businesses. He formally took the CEO role in January 2026, entrusted with preserving Berkshire’ s decentralised philosophy while steering the sprawling conglomerate through its next chapter of growth. businesschief. com 33