The Omaha, Nebraska-based conglomerate purchased Occidental shares every trading day from June 5 to Monday, totaling an additional 7.3 million shares with purchase prices slightly under or above 60,filingsshowed.′Readeveryword′WarrenBuffett′sBerkshireHathawayhasscoopedupmoresharesofOccidentalPetroleumovereachofthepastninetradingsessions,drivinghisgiganticstakeintheHouston−basedoilandgasproducertoalmost2910 billi ...