The $ADD Sector Weighted Advance/Decline Indicator is a sophisticated market breadth analysis tool designed for ThinkorSwim traders. Unlike traditional advance/decline indicators, this innovative metric takes into account the actual market capitalization weights of the 11 S&P 500 sectors, providing a more nuanced and accurate representation of market strength. By analyzing the performance of individual sectors with their respective market cap weights, the indicator offers traders a comprehensive view of market dynamics, helping them understand whether market movements are broad-based or concentrated in specific sector segments.