August 24, 2015, when China’s Shanghai Composite plunged during a global sell-off, was nicknamed Black Monday.
The Shanghai Composite Index fell 8.49% on August 24, 2015, its largest one-day percentage decline since 2007. The fall came after weeks of sharp volatility in Chinese equities and contributed to heavy losses in markets across Europe, Asia, and North America.
Investors were concerned about China’s economic growth, falling commodity prices, currency developments, and the possibility that weakening Chinese demand would affect the global economy. The selling also reflected uncertainty about market-support measures and the sustainability of earlier share-price gains.
This event is separate from the 1987 Black Monday, when markets around the world suffered a much larger synchronized crash. Both dates share the nickname, so the year and market must be specified to avoid confusion.