Abstract — The purpose of the paper is to identify the variables
that affect profitability of the manufacturers of mushroom
compost in Poland. The profitability is measured as Return on
Assets (ROA). In the article an attempt has been undertaken to
determine the power and direction of the influence of chosen
factors (Cost of Sales to Sales Ratio, Debt Ratio, Days Sales
Outstanding, Days Inventories Outstanding, Days Payables
Outstanding, Cash Conversion Cycle) on ROA, applying method
of multiple linear regression. The study uses data from the
Official Journal of the Republic of Poland “Monitor Polski B”.
The relationship between independent variables and ROA is
examined using descriptive analysis, correlation analysis and
forward regression analysis. The sector of mushroom compost
manufacturers, given the very good profitability indexes and
recorded increases in sales, can be considered a very attractive
domain of business activity. The result shows there are a
significant relationship between Cost of Sales to Sales Ratio and
ROA (p