Oil and gas operatorOccidental Petroleum Corporation (OXY) has seen shares rise 7 precent in the past year. More importantly,Berkshire Hathaway (BRK-A) has been buying up shares as they drop to the low $60 range. One trader sees a bullish move ahead for the stock following the latest drop. That’s based on the March 31 $63 calls. With 21 days until expiration, 4,625 contracts traded compared to a prior open interest of 229, for a 20-fold rise in volume. The buyer of the calls paid $1.82 Shares recently traded just over $62, to shares need to rise less than $1, or about 1.5 percent, fo...
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