In the first quarter of 2022, Warren Buffett's holding company Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) revealed a massive stake in Occidental Petroleum (NYSE: OXY). At the time, Berkshire held about 91 million Occidental shares worth roughly $5 billion -- or just under 10% of the company's total share count. Today, that stake is even bigger. How much bigger? A lot bigger.

Besides Berkshire's initial 91 million shares, it also owned warrants to buy another 83.9 million shares. Those were tied to a 2019 loan worth $10 billion that helped Occidental acquire Anadarko Petroleum, another oil and gas producer.

In the summer of 2022, Berkshire received regulatory approval to buy up to 50% of Occidental. That approval is coming close to being necessary. According to recent filings, Berkshire's stake is now up to 255.3 million shares worth around $15 billion -- nearly 30% of the company's total share count. It also still owns more than 83 million warrants with a strike price of $59.62 per share, just below the current trading price.

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Source Fool.com