There is no universal rule investors use to predict the price of stocks. However, experienced investors do follow specific trends that influence stock prices now and in the future, explains Investopedia.
For example, investors typically use current stock market trends that help them predict the future price of individual stocks. If a particular market such as the Standard & Poor's 500 index is trending upward, investors determine whether or not the stocks in their portfolio are following the same upward trend. In many instances, stocks in the investorﾒs portfolio do follow the trend, and they can set a target price for their stocks based on the prices of other stocks that trade in the same market, according to Investopedia.