Trading Logic tracks U.S. stock market breadth across the S&P 500, aggregated into 11 GICS sectors. The Breadth Score — a single number from 0 to 1100 — measures how many sectors are showing broad participation above the 20-day moving average. A score above 700 signals broad market strength; below 400 indicates widespread weakness.

Unlike price-only indicators, breadth shows whether a market move is driven by the whole market or just a handful of stocks. When large-cap tech rises while 70% of S&P 500 stocks are below their moving averages, breadth reveals the divergence that price charts hide.

Updated daily after market close. Use this dashboard to gauge overall market health before making sector or stock-level decisions.