Which 2015 crash caused China's Shanghai Composite Index to fall by about 43% from June to August?

The 2015 Chinese stock-market crash caused the Shanghai Composite Index to fall by about 43% from June to August.

The Shanghai Composite rose sharply during the first half of 2015 as millions of individual investors entered the market, often using borrowed money. The rally pushed valuations higher, particularly for smaller companies, and officials became concerned about excessive leverage.

The decline began in June 2015. As prices fell, margin calls forced investors to sell, creating additional downward pressure. The Shanghai Composite dropped from its June 12 peak of 5,178.19 to 2,850.71 on August 26, a decline of roughly 45% over that interval.

China's government responded with measures including trading restrictions, state-backed purchases and support for brokers. The crash was not the same event as the 2007–2008 fall, although both followed major Chinese equity-market rallies.