Which 2015 Chinese market crash saw the Shanghai Composite fall by about 30% in one month?

The 2015 Chinese stock market crash was the sharp decline in Chinese equities during the summer of 2015.

The Shanghai Stock Exchange had risen rapidly after retail investors entered the market in large numbers, with substantial use of margin financing. The Shanghai Composite reached a recent peak on June 12, 2015, then fell by roughly 30 percent over the following month. Government measures attempted to slow the decline, including restrictions on some share sales and support for major stocks.

The turbulence continued into 2016, when a new circuit-breaker mechanism was introduced and then suspended after brief trading sessions intensified investor anxiety. The episode affected global markets and raised questions about China’s financial regulation and the risks of leveraged speculation.

This event is not the same as China’s 2015 currency devaluation or the 2015–2016 global commodity downturn. The question concerns the fall in Chinese share prices, especially the Shanghai Composite.