(Reuters) – Warren Buffett’s Berkshire Hathaway (NYSE:) Inc has purchased one other 5.9 million shares of Occidental Petroleum Corp (NYSE:), boosting its stake within the oil firm to about 15.2%.

The purchases had been made on Monday and Tuesday and value about $336 million, Berkshire stated in a regulatory submitting on Wednesday night time.

Following the purchases, Berkshire owned about 142.3 million Occidental shares price roughly $8.8 billion, plus $10 billion of most popular inventory it acquired in 2019 to assist finance Occidental’s buy of Anadarko Petroleum Corp (NYSE:).

Berkshire additionally has warrants to purchase a further $5 billion of Occidental shares at a slight low cost to their Wednesday closing value of $61.57.

Occidental’s share value has greater than doubled this yr, benefiting from Berkshire’s purchases and rising oil costs, which bought an extra increase after Russia’s invasion of Ukraine.

Berkshire has been on a spending spree in 2022.

It spent $51.1 billion on equities within the first quarter, together with by growing its stake in oil firm Chevron Corp (NYSE:) to $25.9 billion.

Berkshire has additionally this yr introduced massive investments in online game maker Activision Blizzard Inc (NASDAQ:) and pc and printer maker HP Inc (NYSE:), and a deliberate $11.6 billion buy of insurance coverage firm Alleghany (NYSE:) Corp.