In an SEC Form 4 filing after the market closed on September 19, Berkshire Hathaway (NYSE: BRK.A, BRK.B) reported that it added $1.4 million to its stake in Phillips 66 (NYSE: PSX) on September 15 at an average price of $77.53 per share. Berkshire Hathaway now owns 80.7 million shares of PSX, representing 15.4% of its outstanding shares. Berkshire’s PSX investment is valued at $6.5 billion at the September 19 closing price on the New York Stock Exchange of $80.35. Previously, Warren Buffett had disclosed that PSX was his investment and not that of his portfolio managers Todd Combs and Ted Weschler.

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