The purpose of this article is to present the possibilities of using the first order grey model GM (1,1) in the prediction of short financial time series on the example of construction and building materials companies listed on the Stock Exchange in Warsaw (WSE). The period of analysis includes data from the years 2011-2014, whereas the forecast of sales revenue was formulated for 2015. Chapter 1 presents the essence of the GM (1,1) gray model through the description of the procedure aimed at obtaining these forecasts. Chapter 2 expands upon the subject of the research and the selection of research methods. The third chapter presents the prediction results with an analysis of the relative errors – both in relation to the variables designated ex post, as well as the actual values. The last chapter includes a synthetic discussion of the obtained results and a summary.