The Shanghai Composite’s largest one-day percentage fall during China’s 2015 crash was 8.49%, recorded on August 24, 2015.
The session became known internationally as Black Monday. It occurred during a broader collapse that followed a dramatic rise in Chinese share prices from mid-2014 into mid-2015. Many investors had used borrowed money to buy shares, so falling prices forced some to sell, adding pressure to the decline.
The sell-off reflected several overlapping concerns: slowing Chinese economic growth, uncertainty about government intervention, currency-market changes, and worries about corporate debt. The fall also affected markets around the world, helping make August 24 one of the most turbulent global trading days of 2015. The Shanghai Composite measures the performance of shares listed on the Shanghai Stock Exchange. It should not be confused with the Shenzhen Composite or the broader CSI 300 index, which can show different daily movements.