Berkshire now owns 264 million Occidental shares worth about $12 billion, a 28% stake in the big U.S.-focused energy company.

Occidental Petroleum's fundamentals and valuation have improved, presenting a long-term buying opportunity amid oil and gas ...

Methane continues to create environmental risks across the globe. Sadly, this harmful greenhouse gas contributes to ozone loss and is a major cause of lung disease. As such, a lot of effort has been ...