Icahn Enterprises

RANK453

This conglomerate's holdings span industries such as energy, automotive, and real estate, and include well-known brands such as Pep Boys and Trump Entertainment Resorts. Founder Carl Icahn, who turned 85 in early 2021, remains by far the majority shareholder in the company with some 221 million shares under his control worth some $11.9 billion as of March 31, 2021.