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This thesis gives an overview of the research that has been conducted studying major risk-factors (size, value, profitability, momentum, investments) and Fama-French asset pricing models. Aim of this thesis is to study changes in major risk factors at the U.S. equity markets after the global financial crisis. The empirical part of this thesis uses three 120-month periods of daily data, focusing mainly on changes between the 120 months before and after the global financial crisis using the end of 2008 as a breakpoint for data. Also, the performance of the Fama-French five-factor model is evaluated in three different periods, revealing information on how the model works with various samples of data. Research set up follows mainly similar approach as in Fama and French asset-pricing studies by using portfolio sorts of different characteristics and portfolios that mimic risk factor returns. This thesis adds to the existing literature by evaluating three short periods of 120-months and comparing relative changes on these periods. The main focus is comparing risk-factor coefficients, risk factor return patterns, and performance of the Fama-French five-factor model in (01/1999–12/2008) data sample to (01/2009–12/2018) data sample in the U.S. equity market. The third period is used to control and point the magnitude of changes after the financial crisis. Results of the empirical part of this thesis reveal significant differences in risk-factors after the financial crisis. Previously discovered risk-factor return patterns disappear in the period after the financial crisis. This change is significant as clear and strong patterns of risks factor effects in average returns can be seen in the first two periods. Regression tests reveal clear trends in risk-factors coefficients. Profitability factor obtains explanatory power (importance) coming to the present day as the value factor loses explanatory power. Size factor gains on small firms’ categories but loses on big-si