Oil executives have been making headlines recently, due to large purchases of their own company’s stock. In fact, insider buying in the oil industry is higher than any other industry, except the machinery industry. Who’s buying? Major insider purchases for the month of March were made by Kinder Morgan (NYSE: KMI) and Diamond Offshore Drilling (NYSE: DO). Diamond Offshore Drilling’s CEO, Corp Loews, purchased 685,373 shares on the open market, and Rich Kinder, CEO of Kinder Morgan, purchased 100,000 shares of Kinder Morgan. In March, Rich Kinder and Corp Loews weren’t the only executives buying company stock. The Director of...