Utilize the input text as a context reference, choose the right relationship between 'Warren Buffett' and 'Berkshire Hathaway' from the options.
Options: manufacturer, owner of, distribution format, currency

NEW YORK (Reuters) - Billionaire investing icon Warren Buffett said on Tuesday that there are dozens of countries in which his sprawling Berkshire Hathaway conglomerate would be interested in buying new businesses.
owner of