For example, two notable value investors operate businesses that fall into this category -- Tom Gayner at Markel and Warren Buffett at Berkshire Hathaway ( NYSE:BRK-A ) ( NYSE:BRK-B ) .
Utilize the input text as a context reference, choose the right relationship between 'Warren Buffett' and 'Berkshire Hathaway' from the options.
Options: owner of, industry, owned by, stock exchange