If I buy a stock for $1000 today, some other rich person gets to use that $1000 to exploit labor on my behalf, and if they are ruthless enough, the stock value will go up.
Then I can sell it to someone else, take the proceeds to live off of and buy more exploitation certificates.
To be fair, those "holdings" are investment accounts, where the money gets to be used by a different rich person to exploit labor, because the billionaire can't even be bothered to do that themselves.
It's going to feature a dentist chair and a bunch of weird heads on the walls, isn't it?