The integration of environmental, social, and governance (ESG) factors into investment analysis marks a paradigm shift in the financial landscape. Investors now recognize the significant impact that sustainability factors exert on a company’s enduring performance and risk profile, transcending traditional financial metrics. This chapter delves into the manifold dimensions of ESG integration within investment analysis, exploring both fundamental and valuation models. Fundamental models play a crucial role in unraveling the implications of ESG factors on investment decisions. This comprehensive evaluation ensures that nonfinancial dimensions are integral to the decision-making process, recognizing the intrinsic link between responsible business practices and long-term financial viability. The valuation process now involves meticulous analysis of factors such as climate change exposure, resource management, labor practices, and ethical decision-making. This expanded approach reflects the growing acknowledgment that ESG factors can serve as indicators of a company’s intrinsic worth and future financial performance. The chapter ventures into discerning ESG risks and opportunities embedded in investment decisions. By scrutinizing the relationship between ESG performance and financial outcomes, the exploration is fortified by empirical evidence, presenting a nuanced understanding. Studies consistently underscore a positive correlation between robust ESG performance and enhanced corporate financial performance, particularly pronounced over the long term. This accentuates the substantive contribution of ESG considerations to prolonged value creation. In essence, the integration of ESG factors into investment analysis signifies a pivotal evolution in the financial landscape. It denotes a departure from conventional metrics, acknowledging the broader spectrum of factors that mold a company’s performance and resilience. As investors increasingly seek a holistic understanding of potential investments, ESG integration emerges as a cornerstone, aligning financial objectives with sustainable and responsible business practices. This shift underscores a transformative era where considerations beyond mere financial metrics are integral to informed and socially responsible investment decisions.