Warren Buffett’s Berkshire Hathaway Inc. disclosed a $4.5 billion stake in Phillips 66, the Houston-based oil refiner, as the billionaire investor’s company increases its bet on the energy industry.

Berkshire held almost 58 million shares after purchases this week, or more than 10 percent of the total outstanding, according to a regulatory filing issued Friday by Buffett’s Omaha, Nebraska-based company. Phillips 66 closed at $77.23 on Friday in New York.

Buffett and his deputy investment managers, Todd Combs and Ted Weschler, are known for making large, contrary bets on stocks. The latest wager comes amid a slump in crude prices, driven by concerns that a supply glut will persist.

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