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With oil prices down this month, billionaire investor Warren Buffett is once again buying the dip by adding to one of his favorite energy stocks, as his investing conglomerate Berkshire Hathaway purchased roughly $500 million worth of Occidental Petroleum shares this week.

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Buffett’s Berkshire Hathaway purchased roughly 9.5 million shares of Occidental over the past week at a cost of nearly $530 million, according to a new regulatory filing late on Wednesday.

After a buying spree that started in late February, Buffett’s investing conglomerate now owns roughly 152 million shares of Occidental—a 16.3% stake worth nearly $8.5 billion that makes Berkshire by far and away the largest shareholder in the energy giant.

Shares of Occidental Petroleum failed to rally on the news Thursday, but it remains one of the best-performing stocks this year, rising over 90% thanks to the massive spike in oil prices that has occurred this year.

Though oil has spiked this year—reaching a high of nearly $140 per barrel ever since Russia’s invasion of Ukraine in late February, prices have moderated this month, with energy stocks paring back some of their momentous gains from earlier in 2022.

Oil continued to fall on Thursday: The price of US benchmark West Texas Intermediate sits at nearly $105 per barrel (down from nearly $120 at the beginning of June), while international benchmark Brent crude trades at $110 per barrel.

Buffett is betting that the spike in oil and gas prices won’t end anytime soon and is using some of the recent declines as a buying opportunity amid analyst predictions that oil will remain well above $100 per barrel throughout the summer.