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

The Shanghai Composite fell about 8.5% on 24 August 2015, a day called Black Monday.

The index lost 8.49% on 24 August 2015, its largest one-day percentage fall since February 2007. The decline occurred during a broader period of Chinese stock-market turbulence that began after a sharp rally and included concerns about economic growth, currency policy, and the sustainability of high valuations.

The sell-off spread through international markets, with investors also watching commodity prices and the possibility of slower global growth. Chinese authorities responded with measures involving interest rates, reserve requirements, and market regulation, though these actions did not immediately restore confidence.

The Shanghai Composite tracks shares listed on the Shanghai Stock Exchange. It is different from the Shenzhen Component and the CSI 300, which use different groups of listed companies and calculation methods.