Plug Power CEO Andy Marsh (PLUG) on his goal of becoming the “Amazon of hydrogen fuel.” How Oracle (ORCL) plans to dominate cloud computing, we hear from CEO Safra Catz. Is Blue Apron’s (APRN) secondary share offering a sign of distress? One-time tax filers give H&R Block (HRB) a boost -- but will they be back? The Drill Down with Cory Johnson offers a daily look at the business stories behind stocks on the move.

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