The S&P Global Japan Composite PMI Output Index is a key indicator of overall private sector business activity in Japan. It is calculated as a weighted average of the Manufacturing Output Index and the Services Business Activity Index, with weights reflecting the relative size of each sector based on official GDP data. The index draws on survey responses from a representative panel of approximately 800 companies across the manufacturing and services sectors. Although often referred to as the ‘Composite PMI’, this index should not be confused with the headline Manufacturing PMI, as it uniquely captures output trends across both sectors. The Composite Output Index tracks key variables including sales, new orders, employment, inventories, and prices. It is presented as a diffusion index ranging from 0 to 100, where a reading above 50 signals overall growth compared to the previous month, and a reading below 50 indicates contraction.