Utilize the input text as a context reference, choose the right relationship between 'Berkshire Hathaway' and 'Phillips 66' from the options.
Options: member of, owner of, publisher, creator

Sat, Aug 29, 2015, 22:16 BST - UK Markets closed Berkshire Hathaway builds stake in refiner Phillips 66 Berkshire Hathaway builds stake worth nearly $4.5 billion in refiner oil Phillips 66 By The Associated Press | Associated Press – 2 hours 8 minutes ago 77.23 +2.21
owner of