John Hammergren, chairman, president and CEO of McKesson, has exercised options and sold 50,000 shares of its common stock under a prearranged trading plan, according to a Securities and Exchange Commission filing Wednesday.

The stock sale was conducted under a prearranged 10b5-1 trading plan, which allows a company insider to set up a program in advance for such transactions and proceed even if he or she comes into possession of material nonpublic information.