Takeovers and mergers are a complex area of study, and many across law and finance have devoted their time and effort into researching this vast area. This book takes a closer look at post-bid takeover defences and its value in the corporate world. Using Bainbridge's definition of director primacy, this book argues that more decision-making authority should be assigned to directors rather than shareholders. It compares United States Company Law and the Company Law in England and Wales to illustrate how providing shareholders with more decision-making authority, eventually rings disadvantageous to a company. It does this with regards to post-bid takeover defences of hostile takeovers and with particular attention to Rule 21 of the Takeover Code.