Business / Taxes / Gainer: Stocks that increase in value over the course of the trading day are described as gainers or advancers. Those that increase the most in relation to their opening price are called percentage gainers, or percentage winners. Those that go up the greatest number of points are called net gainers, or dollar winners. On a day that the stock market indexes go up, there are typically more gainers than there are losers or laggards — stocks that have lost value. And on a day where there's little change, there are likely to be similar numbers of gainers and losers.