The article presents an analysis of the quality of semifinished products delivered to a well-known automotive company by over a dozen domestic and foreign suppliers. The monthly percentage distribution of each supplier's share in the tested batch (about 4 million items) and the percentage share of non-compliance disclosed by the recipient for the main suppliers in the examined period is presented In the following, the disclosed non-compliances were divided into basic (most numerous) categories and their division by key suppliers was presented. This analysis allowed to see some kind of a phenomena that can be improved by a more comprehensive look at the whole group of suppliers.