One of the biggest concerns for Apple investors from the beginning of the outbreak was Apple's supply chain. Without its supply chain and manufacturing partners, Apple would be helpless to get its products to market. Fortunately, Mohan says, the vast majority of Apple's suppliers and manufacturers are now back up and running. Apple's leading iPhone manufacturer is Taiwan-based Foxconn, which said in mid-March that it was back to full production. Foxconn said its supply chains to its China facilities had also returned to normal, and Apple said production levels were back to "typical levels" by the end of March.