Peabody Energy Corporation (NYSE:BTU) is one of America's oldest companies. Set up in 1883, the firm is headquartered in St. Louis, Missouri. Like other firms on our list, it is the least innovative when it comes to product diversification. For more than a century, Peabody Energy Corporation (NYSE:BTU) has simply been mining and selling coal - despite America's shift away from the dirty fuel to the cleaner burning natural gas. Additionally, the firm saw business grow in 2022 as the Russian invasion of Ukraine shook up global energy supply chains. Finally, Peabody Energy Corporation (NYSE:BTU) is finally changing too, as the firm announced in 2022 that it will develop a 3.3 Gigawatt solar energy facility.