The study concluded that Profit warning Announcements did not affect the performance of Securities Prices of companies listed on the NSE, Kenya. This study will guide the market activities and provide a better understanding of how Profit warning Announcements affect returns. It will enable the policymakers to assess and evaluate the current status and, provide a platform for making reviews, designs, and formulate policies to regulate and control trading activities on the financial markets, contribute to knowledge and strengthen the foundation for further research. Future research should investigate the effects of Profit warning Announcements on the performance of security prices of specific companies that were affected by the price declines. | Profit warning announcements and the security prices of companies listed on the nairobi securities exchange, Kenya