The main aim of this article is to develop a new model supporting the identifi cation of the particular corporate life stage within the corporate life cycle. This model will be derived from the Boston matrix. The main reason for using this approach as the base for making new model of the corporate life cycle is the fact, that every quadrant of the Boston matrix can be assigned to one phase of the product life cycle and there is supposed, that the phase, in which are most products, determines the phase of the corporate life cycle. For application the Boston matrix by identifi cation phases of the corporate life cycle is necessary to defi ne low and high values of both its variables using some quantities from the model of corporate-and market life cycle by Reiners (2004). So the interval of low and high sales growth is determined by comparing sales of the company and sales of the market and furthermore, there is considered the rate of infl ation to eliminate the impact of price changes. And for determination low and high market shares, there are compared the shares of sales and shares of total assets. A er that, there will be possible to identify all the quadrants and thus all the individual phases unequivocally, which is the basic advantage compared to most existing models of the corporate life cycle. The following aim of this article is to compare the occurrence of individual phases, identifi ed by this modifi ed model, depending on the sector sensitivity to the economic cycle, measured by the coeffi cient of correlation between sales on the market and GDP. There are selected two sectors of the Czech economy, namely one cyclical and one neutral sector. Subsequently there is selected a sample of companies from both these sectors. The data are collected from fi nancial statements of companies and from analytical materials by the Czech Ministry of Industry and Trade and by the Czech Statistical Offi ce. On the basis of this research, there were recorded diff erences especially in the number of companies in the phases of stabilisation and decline, depending on the sector sensitivity to the economic cycle.