The article examines how insider trading affects options market makers, who face unique risks compared to equity market makers. Evidence suggests that options market makers suffer significant losses from insider trading. The study reviews judicial decisions on these losses and proposes a methodology for calculating them. Insider trading is a common practice in today's financial markets, with potential unintended consequences of regulation. Market makers have been identified as a group directly harmed by insider trading, a concern that has gained importance in recent years.