Utilize the input text as a context reference, choose the right relationship between 'Warren Buffett' and 'Berkshire Hathaway' from the options.
Options: owner of, headquarters location, member of, brand

— Warren Buffett is making the biggest bet of his long investment career, a $32.36 billion buyout of Precision Castparts in a deal that will continue to reshape his Berkshire Hathaway conglomerate.
owner of