Shares of Koppers (KOP) have gained 3% over the past four weeks to close the last trading session at $38.03, but there could still be a solid upside left in the stock if short-term price targets of Wall Street analysts are any indication. Going by the price targets, the mean estimate of $64.67 indicates a potential upside of 70.1%.The average comprises three short-term price targets ranging from a low of $64 to a high of $65, with a standard deviation of $0.58. While the lowest estimate indicates an increas ...