St. Paul-Buy low and sell high – and that is exactly what CHS Inc. has opted to do with its shares of CF Industries Holdings Inc. CHS on Sept. 26 received cash of $108.3 million in connection with the sale of all of its remaining 1,610,396 shares of common stock in CF Industries Holdings Inc., and recorded a gain on the sale of $91.7 million. This would equate to an average per share price of $67.25. CF began trading a few years ago at $16.00. CHS said the cash received was used to pay down the company’s revolving line of credit.