The work examines the financial sustainability indicators of fast-growing organizations. The revenue dynamics of fast-growing organizations is modeled by a logistic curve. The model considers the following indicators of financial sustainability: current liquidity, financial leverage. The model is illustrated by calculations based on data from Russian organizations. About 2 thousand fast-growing organizations of all types of activities have been identified. We conclude that some indicators of financial stability for the considered sample of fast-growing organizations look more risky, but do not lead to a judgment of significant risks