Utilize the input text as a context reference, choose the right relationship between Warren Buffett and Berkshire Hathaway from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

View photo Berkshire Hathaway CEO Warren Buffett plays bridge during the Berkshire annual meeting weekend in Omaha, Nebraska May 3, 2015.

Answer: owner_of