The objective of this paper is to critically examine the changing landscape of Environmental, Social, and Governance (ESG) investment by integrating theoretical principles with industry applications. This research is grounded in Freeman’s stakeholder theory and Elkington’s Triple Bottom Line (TBL) and examines the effect of ESG practices on sustainable financial outcomes, while addressing key challenges such as reporting inconsistencies, ethical dilemmas in AI integration, and infrastructural deficiencies in developing economies. The research uses a qualitative method, integrating research insights from existing literature and using case studies of Unilever and Microsoft to illustrate the implementation of ESG policies in practical business environments. The findings reveal that while ESG integration provides long-term financial and reputational gains, its implementation is complicated by greenwashing issues, the absence of standardize metrices, and divergent stakeholder expectations. This paper highlights the requirement of ethical AI implementation, sector-specific criteria, and legislative consistency to improve ESG effectiveness. This research is original in its integrated methodology, amalgamating theoretical frameworks, technical advancements like AI, and behavioral insights to offer a holistic perspective on ESG investing. It combines comprehensive case studies of Unilever and Microsoft, integrating theoretical ESG concepts with real-world business applications. The study identifies substantial deficiencies in ESG standards and offers new insights for future academic and policy-oriented investigations in sustainable finance.