Berkshire Hathaway Inc (BRKa.N) has bought an additional $1 billion of stock in Phillips 66 (PSX.N) this year, and now owns roughly 14.1 percent of the oil refiner.
The conglomerate run by Warren Buffett has purchased about 12.98 million Phillips 66 shares this year, including nearly 2.18 million shares in February, according to regulatory filings through Tuesday night.
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