This came one right after the Build Back Better got approved. He appairently sees the very real possiblility that the rich will have to pay taxes, likely higher than if he took the money now. His tweet is a joke, I think he plans on selling some now to reduce his future tax impact. If my theory is true, other multibillionaires will also do this prior to the end of the year. This flood of sells on the market will result in economic pressure for stock prices to drop. Look for a down 4th quarter.