OMAHA, Neb.—Warren Buffett’s company has bought up more than $11 billion worth of Occidental Petroleum stock this year, giving Berkshire Hathaway control of more than 20 percent of the oil producer.
Occidental’s stock rose more than 3.5 percent on Tuesday to $62.18 after Buffett revealed his latest purchases of nearly 6.7 million Occidental shares worth more than $400 million.
