Which stock exchange suffered the largest one-day percentage fall during China’s 2015 market crash?

The Shanghai Stock Exchange suffered the largest one-day percentage fall during China’s 2015 market crash.

On August 24, 2015, the Shanghai Composite Index fell 8.49%, while markets around the world also experienced heavy losses. The day became known internationally as “Black Monday.” The Shenzhen market and other regional exchanges also declined, but the Shanghai Stock Exchange is the exchange identified with the principal Chinese benchmark in accounts of the crash.

The turbulence followed a rapid rise in Chinese share prices that began in 2014. Retail investors played a large role, and many participants used borrowed money to buy shares. When prices turned downward, forced selling and efforts to reduce leverage intensified the decline.

The 2015 episode is distinct from China’s later 2016 circuit-breaker disruption, although both involved abrupt market stress. Chinese authorities responded with measures including trading restrictions, support for selected shares, and changes to margin-financing rules.