CVS Health

The drug store chain-slash-health care juggernaut leapt three spots on this year's Fortune 500—and got a $62 billion revenue boost—due to its $69 billion acquisition of Aetna, the insurance giant, in 2018. Though investors haven’t entirely sweetened on the deal, CEO Larry Merlo pronounced the integration of the two companies “successful” in February; former Aetna CEO Mark Bertolini, meanwhile, resigned from the CVS board and said the integration was “far from over.” As a pharmacy retailer on the pandemic’s frontlines, CVS’s sales were brisk in the first quarter, but Merlo has warned about the “uncertainties” that surround the long-term performance of the company’s multifaceted business in a time of COVID-19.