New York — CF Industries Holdings Inc. shares shot up about 12 percent Monday July 29, 2103, after a second-quarter investor letter by Third Point LLC, a hedge fund run by activist investor Daniel Loeb, highlighted the stock as an equity position. The letter said CF trades at an unwarranted discount to fertilizer and chemical peers. Third Point believes CF’s cash flow generation strength is misunderstood and that it should deliver a much larger dividend, which would highlight the sustainability of its cash flow generation and lead to a substantial re-rating. CF had no comment last week.