You can commission a buyer that will "work" to get you the best deal. Yes, these "buyers" have direct access to the exchanges. Hint: MM
They are the major buying volume and I am sure their agent is doing some "sellng" to intice some real sellers.
All of the above is only my conspiracy theory as to how things work. Howerer, I have some shares parked in a LT IRA account 'cuz I have to belive they are not buying up such quantities just to see it they can.