Corporate America was rocked this week by the news that Clarence Otis is stepping down from his post as chairman and CEO of Orlando-based Darden Restaurants, the chain which owns brands such as Olive Garden and The Capital Grille and grossed $8.5 billion in 2013. What makes his departure after a decade-long tenure as chief executive so significant, however, is the fact that it will reduce the ranks of African American CEOs who run the nation’s largest publicly traded companies. The following is our list of the most powerful African American business leaders running mammoth enterprises that gross more than $10 billion.