1 Abstract Legal issues of transactions with securities and financial derivatives The aim of this thesis is to analyse valid legal regulations concerning securities and financial derivatives, to compare it with regulations valid before recodification of Czech private law as well as to describe operation of the financial market, where transactions with securities and financial derivatives take place, through analysis of capital market regulation and supervision. The thesis is composed of three main chapters. Chapter One is focused on a definition of the financial market and its structure and further examines the capital market as a part of the financial market. Primary attention is concentrated on capital market regulation and supervision from the perspective of international, European and national law. Conclusion of this chapter deals with the main organizer of the regulated market in the Czech Republic, i.e Prague Stock Exchange. Chapter Two concerns the definitions of securities and their classification according to their forms and types. Shares, as one of the most important type of securities, are covered in more detail. This chapter also outlines issuance of securities and describes main contracts concerning securities. This part also includes a dedicated section on investment instruments embracing both...