In this section, the annual financial statements of 4 companies traded in the professional, scientific and technical activities sector in Borsa Istanbul for the last 5 years were analyzed and interpreted using ratio analysis and vertical analysis techniques. While there are 7 sub-sectors in Borsa Istanbul, 4 companies traded on the stock exchange are; advertising, architecture and engineering activities and related technical consultancy and legal activities are included in the sub-sector. The companies' rates were evaluated according to the averages of their sectors. As a result of the analysis, it can be stated that architecture and engineering activities and the related technical consultancy sub-sector showed a more successful financial performance.