Occidental shares were up 0.5% to $48.61 Tuesday. The Berkshire equity portfolio of about $300 billion is overseen by CEO ...

Berkshire Hathaway Inc . (NYSE:BRKa) (NYSE:BRK.A), led by renowned investor Warren E. Buffett, has expanded its stake in Occidental Petroleum Corp. (NYSE:OXY) by purchasing an additional 763,017 ...