Ensuring the sustainability of functioning under all changes in the economic situation in Russia and in the world continues to be one of the most important goals of managing an enterprise in any sector of the real sector of the economy. This article investigates the stability of the functioning of a sample of the most famous enterprises in the construction materials industry of the Belgorod region: OAO Belgorodasbestocement, ZAO Belgorodskij cement, OAO Belgorodstrojdetal’, OAO Zavod ZHBK-1 and AO Strojmaterialy, using the author’s methods for assessing the stability of functioning. The study period is 2018-2019. The informational basis of the study is the public financial statements of enterprises for 2019. The assessment methodology is based on a system of 12 indicators-indicators of the stability of functioning. For a comparative intercompany assessment of enterprises, the author’s method of calculating a comprehensive assessment was used – a modified method of scoring. Based on the obtained values of comprehensive assessments, stability ratings for the functioning of enterprises for 2018 and for 2019 are compiled.