Apple doesn't own any other companies. However, Apple does have partnership with companies like Intel and some other companies for computers.
Maybe
Sam's Club? --- The UK Asda chain of supemarkets
You can incorporate a business under your own name (ar any chosen name not belonging to another company), or even buy stock in other companies as an individual investor (just on you own!).
Parent companies or holding companies? These can either be limited company's or PLC's, in the UK
Dyson is a private British company. No other company owns them, and to my knowledge they do not own any other companies. I hope this helped!
he owns a painting company
They own Lexus, Scion and Daihatsu.
Boeing is in a partnership with Mcdonell-Douglas for its military operations, Although it is likely this will change to an ownership
No, only Twitter.
None.
Firestone makes their own tires. Firestone is a subsidiary of Bridgestone Tire Company.