Analyze the relationship between 'Warren Buffett' and 'Berkshire Hathaway' within the context of the input sentence.
Options: owner of, owned by, stock exchange, industry

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 ) .
owner of