Stability of functioning is one of the main goals of managing economic entities, whether they are independent business units or divisions of business associations. The complexity of this economic category determines the need to improve scientifically grounded instruments for measuring, assessing and monitoring the level of sustainable functioning. One such tool is the comparative comprehensive assessment (CA) of the stability of functioning, which is described in this article. The assessment author’s methodology is based on a system of 12 indicators of the stability of functioning. For a dynamic comparative assessment of enterprise, the author’s method of calculating a comprehensive assessment is used - a modified method of scoring. The object of the research is ZAO Belgorodskij cement, one of the largest enterprises in the building materials industry in the Belgorod region. The subject of the research is the dynamics of the stability of the functioning of ZAO Belgorodskij cement in the period 2016-2019. During this period, there was a constant struggle between the local authorities and the management of the enterprise for the closure of the plant, which the plant managers oppose. The objectives of the study are to improve the methodology for a comprehensive assessment of the stability of functioning and assess the impact of uncertainty in the position of the plant on the stability of its functioning.