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While oil was crashing, Warren Buffett was buying up oil stocks.
Daily regulatory filings dating back to January 6 show that the Berkshire Hathaway CEO has significantly upped his stake in Texas-based energy company Phillips 66.
In the same period, oil prices have plunged to a new 12-year low.
According to the filings, Buffett's purchases have totaled about 5 million shares in the past few days, increasing his stake in the company to about $5 billion.
Phillips 66 shares were up almost 5% in afternoon trading on Thursday, and the stock is up 4% since the end of August 2015, when Buffett first disclosed a 10% stake in the company.
Buffett last bought Phillips 66 shares in September. Oil prices have plunged about 30% since then.
SEE ALSO: If you're selling stocks because of oil, the worst is probably over
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