Semi-strong-form efficient market

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Semi-strong form of market efficiency states that prices reflect all publicly known and available information.  This includes past market data, which are also public information.  Therefore, the semi-strong form of market efficiency encompasses the weak form.  

This form of market efficiency implies that an investor cannot achieve positive risk-adjusted returns on average by using fundamental analysis, which is is based on public information such as earnings, dividends, and various accounting ratios and estimates.

Compare: Weak-form efficient market hypothesis, Strong-form efficient market