Dark Pools is a practical text dealing with the increasingly vital topic of dark trading, or non-displayed, off-exchange trading execution - in other words, trading that cannot be detected on a screen or through an exchange. With 40% of US equity trading, 15% of European trading, and 10% of Australian and Canadian trading executed off exchange, a thorough understanding of its implications is essential for those dealing in the global equity markets. The book discusses the development, importance, and practice of dark equity trading in an environment dominated by high frequency, program, block, and algorithmic trading, and considers its future prospects in a world of mobile capital and changing regulation. A special focus is placed on the practical aspects of the topic and to regulatory changes that have been enacted in recent years.