This study will examine whether the publication of the accounting has sufficient information content to make the market react to the announcement. Return (the return) is the rate advantage enjoyed the benefits that can be enjoyed from an investment, investors certainly will not want to invest. The purpose of this study is to determine: the publication of accounting earnings affect abnormal stock returns of manufacturing companies on the JSE this study took a sample of 40 publicly traded companies that announced earnings from the period January 1 to December 31, 2003. The sample is selected by purposive sampling.