The paper contains a study of capital requirements for market risks in insurance companies. The author analyzes the importance of insurers' performance indicators in the financial sector; legislative framework and regulation of insurance risks; modules of market risks in the III calculation of insolvency of insurers and the impact of capital requirements on the operations and market position of insurance companies. Insurers, through their function as intermediaries, play a significant role in transferring risk from the real sector to the insurance company. The level of insured risks contributes to the financial stability of the economy and individuals. Insurers have to identify, monitor and measure risks in a timely manner. The author analyzes the operational risk and financial risks of insurers. (credit risk, market riskinterest rate risk, currency risk, liquidity risk). The paper presents the objectives, capital requirements, supervision and market discipline contained in the Directive on the taking up and pursuit of the business of Insurance and Reinsurance (Solvency II). Analysis of insurers' risk exposure at EU level shows a high value for low interest rate risks, equity risks, IT risks, risks arising from asset and liability management and credit risks. According to the data on the risk profile of Croatian insurance companies, market risk is the most significant risk, followed by the risk of non-life insurance premiums. In the final part of the paper, it is stated that capital requirements for market risks are most important in the calculation of the required solvency capital, calculated using a standard formula according to the module and risk sub-modules. The structure of market risks of the largest insurance companies in the Republic of Croatia, there is a large exposure in relation to currency risk, equity risk, concentration and spread risk. Market risk management must be proactive, and has to reflect the structure of the company's liabilities and take into consideration capital constraints.