Which Chinese stock index plunged 8.48% on July 27, 2015, during that year's market crash?

The Shanghai Composite plunged 8.48% on July 27, 2015, during China’s 2015 stock-market crash.

The Shanghai Composite tracks the performance of stocks listed on the Shanghai Stock Exchange and is one of the most watched indicators of mainland Chinese equities. After a powerful rally that began in 2014, the index peaked in June 2015. Concerns about high valuations, leveraged trading, economic growth, and government intervention then contributed to a sharp reversal.

July 27 became one of the most severe sessions of the sell-off. The index’s 8.48% decline reflected widespread liquidation and intensified fears that the market’s earlier rise had been unsustainable. Trading restrictions and official measures were introduced during the wider turmoil, including efforts to support share prices and limit certain forms of selling.

The episode is sometimes confused with the separate Shenzhen market or Hong Kong’s Hang Seng Index. Those markets were affected by the broader anxiety but are different indexes with different listed companies.