Albert Bourla, chairman and CEO of Pfizer, sold millions of dollars’ worth of company stock on Monday as part of a preset plan. But NPR found irregularities about when the CEO entered into that plan.

Albert Bourla, chief operating officer and chief executive officer of Pfizer Inc., listens during a Senate Finance Committee hearing on drug pricing on Capitol Hill in Washington, D.C., U.S., on Tuesday, Feb. 26, 2019. Top executives from seven of the world’s biggest drug companies are testifying before Congress to talk about drug costs, a long-awaited session that could kickstart legislation to rein in prices. Photographer: Zach Gibson/Bloomberg via Getty Images