Perhaps it allows speculation to push up the value of this unit more than would be possible if it was a proper subsidiary. For example, would Rivian be worth as

Perhaps it allows speculation to push up the value of this unit more than would be possible if it was a proper subsidiary. For example, would Rivian be worth as much without the hype on the stock market, for example if Amazon owned it out-righ? I doubt it. Plus, selling part of the company allows raising some cash for their elevated capital expenditures, which were critizised by their shareholders.