Eh, I honestly don't think he has to care how much any news would marginally affect the stock or not. Unless he actually cares if he or Bezos is the #1 wealthiest person -- both being anyways astronomically rich at the end of the day.

I didn't in fact even know he still had a role in Microsoft. My understanding was first Ballmer and then Nadella took over running the show years ago. So I don't think it's not even going to to affect investor sentiment that much.