The monthly Deloitte Western Australia Stock Exchange Index is compiled from publicly available information provided by the ASX and Capital IQ on the market capitalisation of each Western Australian listed company.

A company is included as a Western Australian Company where its ASX Home Exchange is in Western Australia, regardless of whether the company is dually listed.

The base period of the Deloitte WA Index is May 2000 and for the purposes of the index this month is given a notional value of one.

Please note, if a company has been suspended or delisted during a particular period no data will be included for that month and all subsequent months until the company is re-listed or the suspension lifted. Historical information regarding the company's market capitalisation will continue to be included in the calculation of the index.

The latest edition - WA Index - September 2023

The aggregate market capitalisation of Western Australian listed companies declined marginally during the month of August – down 0.2% to close at $368.8 billion. The WA Index faired better than other tracked indexes. The All Ordinaries, US S&P 500, FTSE 100 and Nikkei all regressed during August. The FTSE 100 posted the largest retreat, declining 2.9%. This now places the FTSE 100 as the weakest performing index on an August 2022 to August 2023, year-to-date basis.

Deloitte WA Indices - Previous Editions

Deloitte WA Indices - Special Editions