Whilst the Industry 4.0 concept emerges, practices and benefits of this new digital phenomenon is still vague for many enterprises and researchers. One of the most important reasons for this vagueness is that there is no strict consensus for the definition of Industry 4.0. As the concept can be defined as digitalization of production processes, thanks to the emerging technologies day by day, Industry 4.0 still may be confusing for many businesses and also researchers. In the name of clarifying this vagueness, in this study, it has been aimed to investigate the practices of the Industry 4.0 concept in the companies. “What kind of technologies are used for which activities in the companies under the Industry 4.0 concept?” is the main question for this study. To answer this question companies which are listed as the “Top 500 Hundred Industrial Enterprises” by ?stanbul Chamber of Industry have been investigated. After reviewing annual reports of these companies it has been detected that 30 of them are dealing with Industry 4.0 concept as a strategy and/or application practice. In this study, results of this qualitative analysis will be presented to identify what kind of technological concepts are being used in the Turkish companies. According to the results, artificial intelligence and the robotic applications are the most popular Industry 4.0 technologies used in the reviewed companies.