Warren Buffett's company, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B), can't seem to get enough of Occidental Petroleum (NYSE: OXY). The conglomerate recently purchased another 8.9 million shares of the oil company for $405 million.

Berkshire Hathaway's increased stake in Occidental Petroleum Corporation shows confidence in its potential amidst oil price volatility. Click for more on OXY.

Warren Buffett's Berkshire Hathaway has added to its holdings of Occidental Petroleum and SiriusXM, sending shares of both companies higher Friday.

Despite Buffett overseeing stakes in nearly four-dozen securities, the lion's share of Berkshire's invested assets have been put to work in seven top ideas.