Finance has become one of the most important and popular subjects in management school today. This subject has progressed tremendously in the last forty years, integrating models and ideas from other areas such as physics, statistics, and accounting. The financial markets have also rapidly expanded and changed extensively with improved technology and the ever changing regulatory and social environment. For example, there has been a rapid expansion of financial concepts, instruments, and tools due to increased computing power and seemingly instantaneous information sharing through networks. The internationalization of businesses and economies will continue to impact the field of finance. With all this progress and expansion in finance and society, we thought that it would be useful to put together an updated comprehensive encyclopedia as a reference book for both students and professionals, in an attempt to meet the demand for a key source of fundamental finance terminology and concepts.