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.

5. CF Industries Holdings Inc CF 0.3%

CF Industries’ stock has declined 16.8 percent over the past month, as the company continues to suffer from falling fertilizer prices. Now trading at around $46, the stock has put quite a bit of distance between its share price and the $71 target that Barclays set for the stock back in August.

4. Columbia Pipeline Group Inc CPGX 1.94%

Columbia’s shares have fallen…

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