Modern Western capitalism is pretty similar to the Soviet Union or China's.
"State capitalism" and "monopoly capitalism" (the bad kind according to socialists) are about as different as Coke and Pepsi.
Ultimately the "owners" in practice are people you never heard of that work for (government) pension funds and index funds. The billionaires, founders, and celebrities are mostly a sideshow. That's not a denial of wealth inequality, just as officially socialist countries have.
But nearly all big companies have no owner in a top hat running the show, just faceless committees, responsible for buying everything - that company and all its competitors. Bureaucrats, apparatchiks, public or private, it's much the same.
If the C-suite and directors of huge companies are generally parasites, it's because robber barons and corporate raiders are the exception today. People whose job is to invest trillions of dollars by simply buying everything for sale have the least control imaginable over company managers. The current situation reflects classic criticisms of socialism, but it won anyway.
Nearly every source of information on public company stocks in the US has a figure for "institutional ownership". If a company is of any size, and is a real business, this is usually a high % - this is a reality check if what I'm writing sounds outlandish because nobody talks about anything but Twitter around here.