What is the ASX?
The ASX, or Australian Securities Exchange, is Australia's main stock exchange, based in Sydney. Companies list their shares on the ASX, and investors buy and sell them through brokers.
The ASX was formed in 1987 by merging six state-based stock exchanges, some dating back to the 1800s. It later merged with the Sydney Futures Exchange in 2006.
The exchange lists more than 2,000 companies, from global giants such as BHP and Commonwealth Bank to small mining and technology companies.
The S&P/ASX 200
The S&P/ASX 200 is the main index used to track the performance of the Australian share market. It includes the 200 largest companies listed on the ASX by market value.
Many Australians own shares directly or indirectly through their superannuation funds, so the performance of the ASX affects retirement savings.
The ASX is also a listed company itself. It operates clearing and settlement systems that ensure trades are completed safely. Mining, banking and health care companies make up a large part of the Australian market.
Trading on the ASX takes place on weekdays during set market hours, mostly electronically.