This screen finds stocks whose MACD histogram has just crossed below zero. The MACD Histogram(12,26,9) plots the difference between the MACD line and its 9-day signal line, so it crosses zero exactly when the MACD crosses its signal line and shows whether momentum is speeding up or slowing down. The cross marks a bearish MACD signal-line crossover, a sign that short-term momentum has turned down.