Many investors allocate a portion of their portfolio to stock picking and trading strategies. One popular tactic is tracking stocks with the highest percentage gains, as these moves often signal strong momentum and bullish sentiment. And these stocks are likely to stay on that course unless something happens to reverse it. MarketBeat has a simple screener to help investors identify the Top Stock Gainers during different time periods, in stock sectors, at opening or closing prices, and volume levels. A cauti ...