Famous billionaire investor Warren Buffett has again bought shares in oil company Occidental Petroleum. After spending about $4.5 billion last week to buy 91.2 million shares of the company, he spent more than $1.5 billion again this week, adding another 27.1 million shares to Berkshire Hathaway’s portfolio, CNBC writes.

The purchases were made on Wednesday, Thursday and Friday at prices ranging from $51.03 to $58.58, according to filings with the U.S. Securities and Exchange Commission (SEC). The weighted average share price is about $56.60.

That gives Berkshire a total of 118.3 million shares worth nearly $6.9 billion at last Friday’s close of $57.95.

As a result, OXY stock ranks 9th in Berkshire’s portfolio, giving Buffett’s corporation nearly 12% of Occidental’s outstanding shares.

You can also think of the warrants to buy nearly 84 million shares from the 2019 deal that helped Berkshire finance its purchase of Anadarko Occidental – then totaling nearly 20%.

The warrants have an exercise price of $59,624.

Along with rising oil prices, Occidental shares are up nearly 90% over the past year, while Berkshire shares hit an all-time high on Friday and are up 9% since the start of 2022.