Refer to the input text as context and select the correct relationship between 'Berkshire Hathaway' and 'Phillips 66' from the available options.
Options: owner of, subsidiary, distributed by, owned by

(Reuters) - Warren Buffett's Berkshire Hathaway Inc (BRKa.N) disclosed a $4.48 billion stake in oil refiner Phillips 66 (PSX.N), rebuilding a bet it had made in the energy industry before oil prices fell.
owner of