There are many reasons a corporate employee might sell some or all of their company shares. Options come with rules and regs or sometimes a person just needs the money! Or, maybe there's an opportunity out there that seems like a better investment. Like a great deal on a larger mansion.
Nevertheless, it is curious that the President of MCD USA would sell off more than one-quarter of his MCD holdings Especially since the share price has been a nice little run-up over the last ninety days.