Which Chinese stock-market index lost about 8.5% on 24 August 2015, a day dubbed Black Monday?

The Shanghai Composite lost about 8.5% on 24 August 2015, a day widely dubbed Black Monday.

The Shanghai Composite tracks shares listed on the Shanghai Stock Exchange. During 2014 and the first half of 2015, Chinese equities rose rapidly, supported by investor enthusiasm and extensive margin financing. The rally reversed during the summer, and efforts to stabilize prices did not prevent further selling.

On 24 August, the index suffered its largest one-day percentage fall since 2007. The decline spread through global markets because investors feared slower Chinese growth and questioned the effectiveness of official market support. Commodity prices and currencies were also affected by the broader concern about China's economy.

The Shanghai Composite is not the same as the Shenzhen Component or Hong Kong's Hang Seng Index. Those indexes represent different exchanges and groups of companies. The 2015 episode also differed from China's 2007–2008 market collapse, although both involved sharp falls after strong advances.