Standardization has a strategic importance for the organization. The number of companies that have adopted ISO 9000 increased during the last years. According to the reports in CLUB 9000, in May 2010 there were 5,556 ISO 9000 certified companies in Bulgaria. There are no empirical studies in Bulgaria that investigate which companies decide to adopt ISO 9000. Using secondary data, this study builds a profile of ISO 9000 certified companies. The results show that companies with more resources, more foreign relations, higher degree of external regulatory pressure, and operations focus on high quality, not low price, have a higher probability of certification than the companies that do not have these characteristics.