The paper focuses on evaluation of insurance portfolios belonging to the insurance companies ČSOB and Komerční pojišťovna from the vantage point of growth rate of premium written and expense ratio of the insurance portfolio. The aim of this paper is to ascertain whether the selected insurance companies experience lower expense ratio of their insurance portfolio than what is the average expense ratio of insurance portfolios on the Czech insurance market. The reason for doing this research is in the fact that the insurance companies ČSOB and Komeční pojišťovna are entities with a developed bancassurance model. As the authors discovered in their earlier research, insurance companies using this model experience lower expense ratio. This paper analyzes the selected insurance companies on Czech insurance market considering the cooperation between the bank and insurance company. It analyzes the volume of premium written concluded through the distributional channel of bancassurance, and eventually compares expense ratios of the selected insurance companies with the average value on Czech insurance market between 2012 and 2016. Expense ratio of life insurance in both insurance companies shows lower values than the average value on the Czech insurance market. The same applies to total insurance. The research confirms that Komerční pojišťovna shows lower average value of expense ratio than ČSOB pojišťovna.