The article is devoted to ensuring enterprises’ economic security in the context of an unstable external environment. The purpose of the article is to develop an institutional mechanism for ensuring the economic security of enterprises. The study examines the key aspects of ensuring enterprises’ economic security under highly dynamic external changes. It is determined that economic security is a multifaceted system encompassing financial, informational, human resource, technological, legal, environmental, market, and investment components of enterprise operations. These components’ interaction and role in ensuring enterprises’ stability, competitiveness, and protection are analyzed. The study substantiates the importance of financial security as the foundation for sustainable enterprise development, which ensures the balance of income and expenses, effective capital management, and minimization of financial risks. The importance of information security is highlighted, focusing on protecting commercial information, monitoring cyber threats, and maintaining data confidentiality. The significance of human resource security is emphasized, including the development of human capital, enhancement of employee motivation, and minimization of internal conflicts. Technological security is analyzed as a factor ensuring the modernization of production processes, protection of intellectual property, and implementation of innovative technologies. Legal security is a tool for avoiding legal risks and ensuring compliance with legislative requirements. The essence of environmental security is revealed in transitioning to sustainable development, mainly through implementing energy-efficient solutions and reducing environmental impact. The article proposes an institutional mechanism for ensuring the economic security of enterprises, which is based on integrating and harmonizing regulatory, organizational, resource, and market components of institutional support. It is determined that the regulatory component ensures legal stability, the organizational component establishes effective management structures, the resource component optimizes resource management, and the market component enhances competitiveness and adaptation to market changes. The comprehensive approach involves the interaction of institutional components with the key aspects of economic security: financial, informational, environmental, human resource, legal, technological, investment, and market components. The proposed mechanism enables enterprises to minimize risks, adapt to external challenges, leverage new growth opportunities, and ensure sustainable development in the long term. Keywords: economic security of enterprises, mechanism for ensuring economic security, institutional components, institutional mechanism, risks, threats.