Analyze the relationship between 'Berkshire Hathaway' and 'Warren Buffett' within the context of the input sentence.
Options: original broadcaster, owned by, position held, platform

With the $37.2 billion deal to buy Precision Castparts (NYSE: PCP - news ) announced Monday, US investment guru Warren Buffett is extending his storied Berkshire Hathaway (Sao Paolo: BERK34.SA - news ) holding company.
owned by