Robert Ziff (son of infamous publishing giant William Ziff Jr) currently does not hold ownership of or day-to-day responsibilities of governing any company. He took over Ziff/Davis Publishing Company and built the Niche magazine world (things like PC World, Car & Driver, etc.) but sold 95% of the shares to Forstmann Little in '94.
He and his two brothers also started Ziff Family Investments but this company does not serve the public. It was formed when he seeded Daniel Och for his 10% stake in the family wealth.
No, CNET is owned by Red Ventures, a digital media company, while Ziff Davis is a subsidiary of J2 Global, a cloud services, unified communications, and digital media company.
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Yes, a single person/business can own many companies.
Audi is owned by volkswagon it does not own anything
many. apple for example
50 owns like 249 companies now
Companies such as coke, pepsi, kraft that own many different types of services
Many companies produce different Eye Creams, one of the main companies is John Lewis and Boots even produce their own too. Normally when a product is made many other companies end up making their own cheaper versions.