In the context of the input sentence, determine the relationship between 'Warren Buffett' and 'Berkshire Hathaway'.
Options: platform, product/material produced, developer, owner of

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.
owner of