The article discusses the importance of preventing insider trading and ensuring market integrity. It explains what insider trading and market abuse are, and why they are harmful to the financial system. The focus is on the figure of the insider of itself, exploring different cases and regulations in Europe and Italy. The study also looks at insider transactions and their impact on stock returns, using an empirical model to analyze the Cremonini case. The findings highlight the significance of enforcing laws against insider trading to protect human rights and maintain financial stability.