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This paper examines the effect of the exogenous information on stock prices. The analysis contributes in literature on the semi strong efficiency. It brings the informational nature nearer information, defined as informative coloration, which strikes the financial market to its underlying credit. The proposed test model is based on the nonparametric statistics. This model develops the possibility to examine the whole exogenous information on stock prices variations. The statistical performance of the model during the empirical application shows its ability to anticipate correctly the movements of prices. It challenges the semi strong form of efficiency markets.JEL codes: C14, D83, G14