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Warren Buffett at a press conference during the Berkshire Hathaway Shareholders Meeting on April 30, 2022.

Warren Buffett's Berkshire Hathaway on Friday received regulatory approval to purchase up to 50% of oil giant Occidental Petroleum.

Shares of Occidental jumped 10% on the news to close at $71.29 apiece, pushing their 2022 gains to more than 145%.

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