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Due to the issues brought about by the current Information Age, such as rapid development of technology, easy and fast access to information, increases in international relations and global market perception, companies were compelled to seek for sustainable competitive advantage, and in this sense, the concept of "corporate reputation", which is powered by unique and original values of a corporation and which cannot be "imitated", has started to draw attention. In our day when markets are gradually reaching the point of saturation and consumers are getting the chance to evaluate more and more options, the efforts to create a convincing difference in minds have become prominent, and subsequently, reputation management has become an important field which a company needs to effectively manage. Corporate reputation management and the communication types the company will adopt in this sense have gained importance in all areas related to strategic management elements, from market positioning of products to shaping of intellectual perception maps. Corporate reputation management, wherein integrated marketing communication and public relation activities extremely important roles, needs to be strategically managed. Management of the concept of corporate reputation, which is a product of tangible and intangible corporate components, have transformed into a strategic requirement and become an field of its own as "corporate reputation management" within modern business administration.  The fact that corporate reputation management, which has a relation with almost all activity fields of a company, is in contact with elements such as corporate social responsibility, management based on ethical principles, performance assessment studies in human resources management and the of phenomenon of governance, the recent agenda, which all affect the field of sustainable competition, indicates that this concept should be evaluated in terms of business management strategy.

The Efficient Market Hypothesis, developed by Fama, is a market in which prices reflect the current information and where abnormal returns are not possible. In case the securities value reflects the information fully, the existence of the efficient market is mentioned. Within the framework of market mechanism, if these concepts are not sufficient, behavioral finance has emerged focusing on the effect on stock prices. A brand is a symbol, a name or a combination of a merchandise for distinguishing it from the like.Owning a brand is more than a logo or symbol.The brand covers the entire business and affects the perception of customers. Brand value is the value of the brand's name, symbol and reputation.. Thus, the arrangements within the company that can be useful within the company could be done in a timely manner. Creating a brand and brand value has been a powerful competitive tool for businesses.Brand Finance, covers Turkey's most valuable 100 brands. To measure the strength and value of these brands, it annually determines the value of the world's largest brands and publishes its ranking. In this research, the effects of the increase, decrease and constant brand power on the share prices of companies listed in the BIST 100 index in the list of Brand Finance Turkey 100 in the years 2012-2017 were analyzed. According to the findings, it is seen that the changes in brand ranking have an effect on market performance of firms.
  

The Efficient Market Hypothesis, developed by Fama, is a market in which prices reflect the current information and where abnormal returns are not possible. In case the securities value reflects the information fully, the existence of the efficient market is mentioned. Within the framework of market mechanism, if these concepts are not sufficient, behavioral finance has emerged focusing on the effect on stock prices. A brand is a symbol, a name or a combination of a merchandise for distinguishing it from the like.Owning a brand is more than a logo or symbol.The brand covers the entire business and affects the perception of customers. Brand value is the value of the brand's name, symbol and reputation.. Thus, the arrangements within the company that can be useful within the company could be done in a timely manner. Creating a brand and brand value has been a powerful competitive tool for businesses.Brand Finance, covers Turkey's most valuable 100 brands. To measure the strength and value of these brands, it annually determines the value of the world's largest brands and publishes its ranking. In this research, the effects of the increase, decrease and constant brand power on the share prices of companies listed in the BIST 100 index in the list of Brand Finance Turkey 100 in the years 2012-2017 were analyzed. According to the findings, it is seen that the changes in brand ranking have an effect on market performance of firms.
  

Due to the issues brought about by the current Information Age, such as rapid development of technology, easy and fast access to information, increases in international relations and global market perception, companies were compelled to seek for sustainable competitive advantage, and in this sense, the concept of "corporate reputation", which is powered by unique and original values of a corporation and which cannot be "imitated", has started to draw attention. In our day when markets are gradually reaching the point of saturation and consumers are getting the chance to evaluate more and more options, the efforts to create a convincing difference in minds have become prominent, and subsequently, reputation management has become an important field which a company needs to effectively manage. Corporate reputation management and the communication types the company will adopt in this sense have gained importance in all areas related to strategic management elements, from market positioning of products to shaping of intellectual perception maps. Corporate reputation management, wherein integrated marketing communication and public relation activities extremely important roles, needs to be strategically managed. Management of the concept of corporate reputation, which is a product of tangible and intangible corporate components, have transformed into a strategic requirement and become an field of its own as "corporate reputation management" within modern business administration.  The fact that corporate reputation management, which has a relation with almost all activity fields of a company, is in contact with elements such as corporate social responsibility, management based on ethical principles, performance assessment studies in human resources management and the of phenomenon of governance, the recent agenda, which all affect the field of sustainable competition, indicates that this concept should be evaluated in terms of business management strategy.