As every year, the League Leaders Group (publisher of the magazine makers) publishes a new edition of its ranking dedicated to the best law firms specializing in merger control. Real working tool for companies, law firms ranking is made after an investigation of several months. To this end, investigators League Leaders group had contact with legal professionals of the most reputable business (investment banks, financial advice, entrepreneurs, investment funds ...). Questionnaires were sent by the hundreds. Our rankings are based on several criteria. Among them retain the reputation of the firm, the expertise of partners and their ability to impose on reference board records. The departments of revenue and studied the growth and dynamism of the teams are also criteria that may impact on the place of the teams in the standings.