Subject: Re: BRK proxy
2.2 million shares traded at 408ish at the close. That might be brk. IF Buffett doesn't to be sitting on 175 billion, he has to pay up for something!
As a general rule, issuers will not be in the market purchasing their own shares (even under a "trading plan") during the final 10 minutes of the market being open. They don't want issuers "painting the tape" so to speak.
Like you mentioned, today was option expiration and also a Friday pay-period that corresponds with a bunch of automatic, mostly fractional, share purchases - primarily on the opening tick in many securities today. The large reported volumes on the opening tick today are distorted by fractional share purchases. Check almost any stock and you will see this morning's open is a big "automated" buy date.