(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.
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