How MannKind CEO Michael Castagna (MNKD) is managing disappointing news from the FDA and staying focused on its goal of making hyper-personalized therapies. Ultra Clean Holdings (UCTT) sees an end to the global chip shortage. LendingClub (LC) focus on loan originations sees a big payoff. Why Proto Labs (PRLB) may be failing to course correct despite months of effort. The Drill Down with Cory Johnson offers a regular look at the business stories behind stocks on the move.

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