Analyze the relationship between 'Business Wire' and 'Berkshire Hathaway' within the context of the input sentence.
Options: publisher, location of formation, chairperson, owned by

Business Wire is a unit of Warren Buffett's Berkshire Hathaway Inc, and PR Newswire is a unit of Britain's UBM Plc (LSE: UBM.L - news ) .
owned by