If you buy stocks only after a dip, you have plenty to pick from right now. The S&P 500 (SNPINDEX: ^GSPC) is down almost 20% for the year, losing more than 8% of its value last month alone. That means roughly half of the index's stocks performed worse; some of them performed much, much worse.

But before plowing into any of these beaten-down names just because they've been so deeply discounted, it might pay to take a step back and look at the bigger picture. There's a clear commonality among most of last month's biggest S&P 500 losers, which could be a red flag for bigger-picture problems for a particular industry.

As they say, read 'em and weep. Here are last month's six worst-performing S&P 500 stocks.

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Source Fool.com