As the stock trades of Warren Buffett have become the stuff of legend, the Oracle of Omaha does not shy away from insider trades, buying up massive amounts of stock in companies where he already has a substantial stake, including Occidental Petroleum (NYSE: OXY).As it happens, Buffett has recently bought another batch of OXY shares, specifically 1,750,308 of them worth over $100 million, adding up to his previous purchase of more than 250 million stock, according to the data shared by the market analytics p ...