The stock market, securities, financial instruments are very important to the global economy. with its great diversity and extension, which has led to generate a means by which to take an order or identify the many components that make up this activity and this medium is the ISIN code, with which it can identify and properly internationally any securities without any mistake. Thus in order to have the ISIN code is the identification of the different actions worldwide, thus generate better conditions in the stock transactions under specific conditions to avoid confusion. The code or code ISIN International Securities Identification Numbering system is a combination of 12 numbers from alphanumeric form, allowing a total accuracy and leaving no chance to repeat a combination doing more confident and comfortable in securities . The ISIN code is given as the result of a recommendation given by the group of thirty who in 1989 would be more useful to consider the implementation of an international standard which was the ISO 6166 – ISIN-code or to be applied for the identification of securities ; proposal was well received and therefore the vast majority of major world markets and later admitted it began using in the processes of settlement and custody. The standard is the ISIN code, not only was applied by the major markets, but also entered the list of some organizations known as National Numbering Agencies, which in its action are responsible for allocating the emission ISIN code values that occur in the country in which they are present, to which is added that these national agencies act as surrogate coding in the allocation of ISIN code in those countries that have not yet agencies.
As for the organization and structure that has the ISIN code, This is distributed as follows: The first two numbers are ISIN code corresponding to the country of the agency that assigned the code of the issuing country or even the value that is being codified, as an example BR for Brazil, ES for Spain. The next nine numbers refer to the national identification code which each value by country. After these nine numbers ISIN code is passed to the check digit, which is obtained through a calculation out of the eleven previous characters. Among the values that can be codified by ISIN code are: shares, subscription rights and warrants, financial options, futures, investment fund shares, underlying debt, debentures, bonds, mortgage bonds and shares issued public and private entities, commercial paper.