The aim of this study was to analyse the competition position of Polish breeding companies on winter rye market compare to foreign companies in years 2009-2013. It was found that in the analyzed period market position of Polish rye breeding companies in Poland is still dominant. Nevertheless, the market share of foreign companies is getting high. Noteworthy is mainly company KWS Lochow Polska Sp. z o. o., which manifests itself, inter alia, the amount of registered varieties and participation in the seed multiplication, especially hybrid rye.