Regulation National Market System (Reg NMS)

Regulation National Market System (Reg NMS) is a set of rules established by the U.S. Securities and Exchange Commission to improve the quality, fairness, and efficiency of the stock market. It aims to ensure investors receive the best possible prices by promoting transparency across all trading venues, encouraging competition among stock exchanges and trading systems. Key components include rules for best execution, price priority, and access to market data, helping to create a more integrated and equitable marketplace where all investors can access timely and accurate information.