(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.
Utilize the input text as a context reference, choose the right relationship between 'Berkshire Hathaway' and 'Phillips 66' from the options.
Options: owner of, distributed by, owned by, subsidiary