Book excerpt: The Market Abuse Regulation (MAR) entered into force in 2016 within the European Union, which introduced a fully harmonized ban on market manipulation. Even though the regulation is quite detailed, the terms used to define market manipulation are relatively vague and open-ended. In What Is market manipulation? Dr. Andri Fannar Bergþórsson offers unique insight to and an interpretation of the concept of market manipulation, which includes an analysis of case law from the Nordic countries. The aim of the book is to clarify the concept as described in MAR and to provide readers some guidelines to distinguish between lawful behaviour and market manipulation (the unlawful behaviour). Bergþórsson convincingly argues that misinformation is an essential element of all forms of market manipulation.