The company CircuitMess d.o.o. was founded by a young and ambitious Albert Gajšak in 2017, when he was just 18 years old. The company specializes in the production of consumer electronics and it has now been successfully operating for 6 years and employs about twenty people. The subject of the thesis is strategic diagnostic and prognostic analysis of the chosen company while also reviewing the startup companies in general. Furthermore, the aim of the thesis is to determine the state, position and operation of the company through a strategic analysis of the chosen company, based on a top-down approach to analysis. First part of the thesis focuses on theoretical background on strategy and strategic management and on startup companies and their ecosystem in Croatia, while in the following part the subject is analysis of the company's external environment using PESTLE analysis and an analysis of the company's internal environment through the historical development of the company. The financial analysis of the company was carried out as part of the analysis of the company's internal environment using vertical and horizontal analysis of financial statements and analysis of the company using financial indicators. In the last chapter, a prognostic analysis of the company was carried out, taking into account the company's valuation drivers and with the preparation of prognostic financial statements.