Credit rating agencies (CRAs) are of great importance in today's modern financial markets. Primary goal of their business is to secure objective and reliable ratings of debt issuers as well as of different credit instruments that are used by financial services users. In order to deliver appropriate ratings CRAs perform analysis using specific methodology and issue credit opinions on credit worthiness of companies and governments. Beside traditional ratings of corporate and government (sovereign) debt instruments, CRAs issue credit opinions on a wide range of more complex financial debt instruments, including structured finance products. The ratings issued by CRAs have a major impact on actions of every player on the financial markets. Credit opinions are closely followed by investors, borrowers, issuers and governments and observed as the key information in determining investment decisions. The rating of any credit instrument represents an indicator of risk associated with ability of the issuer of the debt instrument to fulfill his contractual obligations, i. e. to repay his debts. Additionally, the cost of raising capital in the market is directly influenced by the rating given to an issuer or credit instrument. The unfavorable ratings are increasing the interest costs, thus making the financing more expensive. CRAs play a vital role in financial markets by reducing the informative asymmetry about the credit worthiness between lenders and investors, on one side, and issuers on the other side, thus increasing market efficiency and lowering transaction costs for both sides. CRAs have started to develop their business model in the early 20th century in the USA. The modern credit rating industry is highly concentrated and oligopolistic with "big three" credit agencies dominated the market and having a combined market share of 95%. A number of regional and local agencies provide specific rating services with very limited impact on the global financial markets. The role of CRAs has expanded wiThthe financial globalization and different regulatory frameworks that assigned CRAs an authoritative position and considerable clout over market participants. Nevertheless, the failed ratings and contribution of CRAs to recent financial and global crisis require revisiting their business model, the role and market position as well as a new and flexible approach to their regulation. Therefore, the aim of the paper is to provide an overview of the development and characteristics of the credit rating industry as well as of recent trends and policy changes in the field of CRAs regulation. [ABSTRACT FROM AUTHOR]