This paper investigates the dynamics of the factors of the Fama & French (1993) model using data from the UK financial market. Since financial markets are exposed to exogenous and endogenous structural changes due to the implementation of new regulative guidelines and/or the fluctuation of investors’ behavior or the unanticipated financial crises, my analysis is based on an econometric methodology that accounts for structural breaks and regimes shifts. According to the empirical results of the p