Shares of Occidental Petroleum Corp (NYSE:OXY) are up 4.4% at 47.36atlastglance,afterWarrenBuffett′sBerkshireHathaway(BRK)boughtanaddition8.9millionsharesintheenergyproducer.Thisisjustoneoftheconglomerate′smovestobuystocksonthedipafterthe recentselloff,andOccidentalisBerkshire′ssixth−largestequityholding. OXYhasmovedlowersincebreakingbelowsupportatthe50 level earlier this month, and yesterday hit a two-year low of $45.17. The stock's "oversold" conditio ...