The topic of this paper is the capital market in general and the capital market in the Republic of Croatia and its role in financing companies. Through the work, they will learn more about the capital market, investment firms, trading venues, transparency and other elements of the financial market and its impact, both on companies and on the overall capital market in the Republic of Croatia. The paper will analyze the financial system, that is, the capital market, which occupies a special place in the financial market, its institutions that mediate the same, as well as the financial instruments it operates on the market. The capital market is a part of the financial market that includes trading in financial instruments on and off the regulated market. In the capital market, the most commonly traded securities are short- and long-term securities, depending on whether the maturity of the debt is shorter or longer than one year. An important role in the Croatian capital market is played by pension and investment funds, insurance companies and commercial banks, which invest the most in capital market instruments. The paper will analyze the stock markets in which securities are traded, and special attention will be given to the Zagreb Stock Exchange.