In this article the authors proceed with the research of the stability of transport logistics system (TLS) as a set of separate units providing the whole cycle of logistics operations when delivering cargoes from the consignor to the consignee. In the previous papers (see references) the authors presented the research of financial stability of logistics systems under conditions of uncertainty applying different methods of modelling, namely, statistical modelling - Monte Carlo method, dynamic programming, benchmarking as well as nonparametric methods of modelling. In this article the analysis of, financial ,stability of the logistics system being investigated is made. And most attention is paid to modelling and analysis of the state of the required financial reserve of the logistics firm providing the financial stability of the whole logistics system on the example of delivering cargoes from the consignor to the consignee by a Latvian logistics firm (LF).