All documents are available in PDF format 
Note: There is a more recent report in Spanish (161 KB), pending translation into English.
The Central Balance Sheet Data Office publishes Resultados anuales de las empresas no financieras on an annual basis (the current edition is for 2007). The publication contains a methodological note available only in the Spanish version (186 KB) and a list of tables with the yearly time series of the results of non-financial corporations over the past ten years (balance sheets, profit and loss accounts, employment and wages, ratios, etc.).
Direct access to each of the chapters: