Which index fell about 8.5% on China’s “Black Monday” of August 24, 2015?

The Shanghai Composite fell about 8.5% on China’s “Black Monday” of August 24, 2015.

The Shanghai Composite dropped 8.49% on August 24, 2015, during a severe period of Chinese stock-market turbulence. The sell-off followed a sharp decline from the market’s June 2015 peak and reflected concerns about China’s economic growth, corporate earnings, currency policy, and the sustainability of earlier share-price gains.

The fall spread through global markets. European and U.S. indexes also declined as investors reassessed growth prospects and risk. China’s authorities responded with measures including interest-rate cuts, reserve-requirement reductions, and efforts to support market liquidity.

The Shanghai Composite is sometimes confused with the CSI 300, another Chinese benchmark, or Hong Kong’s Hang Seng Index. The quoted 8.5% decline specifically describes the Shanghai Composite’s performance that day.