Looking for more expert commentary and daily trading ideas? The Benzinga Pro news and data platform has everything you need. Get exclusive, member-only access today with this deal. CF Industries Holdings, Inc. NYSE:CF, CPGX - The Worst Stock Ideas Of The Past Month After a steep decline in the month of August in response to economic weakness in China, the S&P 500 has bounced back a bit in the month of September. So far this month, the index is up 1.5 percent, but not all of its members have enjoyed the month of September. Here’s a list of the five worst-performing S&P 500 stocks over the past month. CF Industries’ stock has declined 16.8 percent over the past month, as the company continues to suffer from falling fertilizer... More