https://www.siliconvalley.com/2022/01/03/heres-what-elon-musk-is-likely-to-do-with-those-billions-of-dollars-in-stock-sales/

What’s Elon Musk doing with the billions he’s collected in the past two months from selling shares in Tesla?

It seems possible, maybe even likely, that he’s put at least some of the money into SpaceX, the other company of which he is CEO and primary shareholder.