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Information is the most critical factor affecting the market value of securities, and constitutes the basis of the capital market activities. Making right decisions in conducting such activities depends on the realisation of the public disclosure and transparency principles as well as the equal access to information. One of the reasons which prevent the functioning of the capital markets based on trust, honesty, transparency and equality, and cause unfair benefits for investors is the crime of information abuse. The crime of information abuse is regulated in Article 106 of the Capital Market Law. Information abuse is a term of art that refers to unlawful trading in securities by a person who possesses non-publicly available information about a company whose shares are traded or the market, which may affect the value of securities. The subject of the information abuse prohibition can be analysed under four categories, namely a) the managers of the issuers and their controlling parents and subsidiaries as well as the persons who possess information due to their shareholding in such companies; b) persons who possess information due to the performance of a job, profession or duty; c) persons who acquire information by committing a crime; d) persons who know (or must know, if proven) that the information in their possession is in the nature described in the relevant provision. The Capital Market Law's regulation on this matter, which is generally in line with the EU acquis, extended the categories of persons who can commit the crime of information abuse. [ABSTRACT FROM AUTHOR]

In Turkey, in recent years, capital market is constantly continued to develop in the Turkish stock exchange, representing the market index has reached very high levels. Market index, it changes in all the sectors of the same sensitivity reaction. The purpose of this study, Borsa İstanbul (BIST), the sector of the indices, the market index of the susceptibility of the measure, and in this way the stock market, investors are more informed about investing in the direction in order to provide important findings is to expose. For this purpose, using monthly data for previous years, beta coefficients of the sector indices representing sectors in Borsa İstanbul were calculated and evaluated and the findings are presented. [ABSTRACT FROM AUTHOR]

The investors at the process of making investment decisions direct their investment to different sectors through different securities. Although the sectoral choices may be differentiated, the main objective is to optimize the risk. At that point the investors direct their investments by considering the efficiency borders. At the point where efficiency borders end, the Capital Asset Pricing Model (CAPM) appears. The Capital Asset Pricing Model shows the relationship between expected return of any security and its risk. This model is a guide for investors especially at the process of measuring systematic risk. In this study a hypothetical portfolio was created at the Istanbul Stock Exchange and the risk of that portfolio was measured by using Capital Asset Pricing Model. After that risk decomposition was made by purifying the risk of the stocks from total market risk and by this way the systematic risk level of market was measured. [ABSTRACT FROM AUTHOR]

The first application of International Accounting Standards (IAS) is realized for listed companies. Capital Market Board of Turkey (CMB) issued the regulation which includes Turkish translation of IAS and a communiqué containing financial statement and disclosures formats in consequent of IAS. Doing so, CMB aimed to simplify the first application of standards and provide comparability of financial statements. The first applications consequences are arisen by issued financial statements and audit reports of listed companies. In this article, the harmonization degree of income statements of listed companies in Istanbul Stock Exchange (İES) is analyzed and the reasons of disharmony are stated by examining the issued income statements and audit reports. The observed reporting differences for income statement are examined according to the auditing firms and reports. [ABSTRACT FROM AUTHOR]