In any market, at any time, there are stocks whose values are down significantly. But during a market correction, there will be more of those, and you may find opportunities to scoop up bargains for extra profits when the broader market rebounds.
In mid-October, data provided by FactSet showed that exactly half of the stocks included in the S&P 500 Index were down at least 20% from their all-time highs. With the market pulling back since then, it might be interesting to use more recent data to see which ones have declined the most from their 52-week highs.