Refer to the input text as context and select the correct relationship between 'Warren Buffett' and 'Berkshire Hathaway' from the available options.
Options: director/manager, legal form, distributed by, owner of

(AP) -- 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