The article is concerned with analyzing the investment component of the economic security of the State and diagnostics of enterprises' activity. The article considers the theoretical foundations of the investment component of economic security: the essence of the concept of "economic security", the main tasks of achieving economic security, the segmentation of sectors of the national economy by stages of investment development and the main measures of the State to regulate the investment component of economic security are presented. The article considers accounting and analytical support of the investment component of the economic security of the State and diagnostics of activity of enterprises. In order to develop statistical research methods in the analysis of the investment component of the economic security of the State and diagnostics of enterprises, the concept of "investment climate" is interpreted, the components of the investment attractiveness index and their components are systematized. By accumulating general information, the article substantiates an assessment of the economic security of the country, regions, enterprises in various spheres and diagnoses the real state of economic entities. The article considers the issues of investment marketing and marketing research as a diagnostic process in wartime: the goals and principles of investment marketing, investment marketing strategies aimed at increasing the market share using the main factors of marketing activity are outlined, the specifics of marketing research are reviewed. It has been found that in order to create an investment-attractive climate, even in the context of military operations, it is necessary to expand marketing research using modern tools already used in the practice of the world's leading developed economies.

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