The S&P 500 just logged its most bullish January since 2019. But, not every one of its constituents participated in the rally. A surprising number of these stocks, in fact, lost a great deal of ground last month.

There are two schools of thought regarding these extreme laggards. On the one hand, perhaps they're down for a reason. On the other hand, these extreme sell-offs could be misguided, making these pullbacks a buying opportunity.

It's not always easy to figure out which one's the right viewpoint. 

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Source Fool.com