The article is devoted to the topical and controversial issue of assessing the attractiveness of an organization for a potential investor. A variety of investment attractiveness assessment methods are available, but are often time consuming and do not take into account the full range of multidirectional factors. The authors propose a variant of the complex methodology based on the transformation of the Lozhkina and Sokolova methodology and the use of information from open sources only for the evaluation. The assessment is based on consideration of factors of financial condition, development trends and environmental characteristics of the organization. As part of the modernization of the methodology, the pool of indicators was revised. It was supplemented by taking into account the assessment of the investment attractiveness of the country, the introduction of a three-component vector of financial stability, and criteria such as revenue growth rate, experience in implementing investment projects, and the availability and volume of dividend payments for the entire period of the company's activity. The authors propose a method of calculating the ranking of investment attractiveness of an organization on the basis of weighting coefficients of groups of indicators. The approval of the proposed methodology was carried out on the data of Tula Commercial Concrete Plant JSC, the results obtained indicate the clarity and objectivity of the results obtained, and generally characterize the convenience of the methodology.