The document discusses the influence of selected industries on the risk behavior of the Philippine Stock Exchange Composite Index (PSEi). It aims to identify industry sectors that affect the PSEi, evaluate the riskiness of the PSEi based on movements in industry indices using regression analysis, and assess the impact of political administrations on PSEi behavior. Regression results show that property, industrial, financial and oil industry sectors significantly influence the PSEi, except for mining. The model closely predicted PSEi behavior using sectoral index behavior. Political environment was also found to impact PSEi performance.