Banks and miners, in roughly equal measure — plus a tax quirk that makes Australian dividends worth more than they look, and a pension system that keeps buying regardless.
2000Launched
200Constituents
Float-adj. capWeighting
QuarterlyReview
The S&P/ASX 200 launched in April 2000 as Australia's institutional benchmark, replacing older measures with a float-adjusted, liquidity-screened index of the 200 largest eligible companies on the Australian Securities Exchange.
Its sector profile is among the most concentrated in the developed world: a small number of very large banks, and a small number of very large mining companies, together carrying most of the index.
Two industries, one index
Australian banking is highly concentrated, and those institutions are among the largest companies in the country. Mining reflects iron ore, coal, gold and lithium producers selling primarily into Asia — which makes the index an unusually direct equity proxy for Chinese industrial demand.
The combination produces a benchmark that responds to two largely unrelated drivers: domestic housing credit on one side, and Asian commodity demand on the other. Technology weight is small.
Franking credits
This is the feature that makes Australian index returns hard to compare internationally.
Why Australian dividends are worth more than they appearDividend imputation
Simplified. Treatment depends on the investor's own tax position and residency, and the rules are specific — this is structural background, not tax advice.
The distortion runs deeper than after-tax arithmetic. Because franked dividends are valuable to domestic shareholders, Australian companies face pressure to distribute earnings rather than retain them — which shapes capital allocation across the entire listed market, and is one reason the index skews toward mature, high-payout businesses.
Australia's compulsory superannuation system channels a steady share of wages into retirement funds, a large portion of which flows into domestic equities. The result is a persistent structural bid for a relatively small listed market — a flow dynamic with few parallels elsewhere.
Facts worth knowing
It replaced the All Ordinaries as the institutional benchmarkThe All Ordinaries is broader and still published, but the ASX 200 is what mandates reference.
Reviewed quarterlyWith liquidity screens as well as size thresholds.
Iron ore is a market-moving commodityFew developed-market indexes are as exposed to a single raw material's price.
Payout ratios are high by global standardsA direct consequence of the imputation system rather than of company maturity alone.
Timezone mattersAustralia trades ahead of Asia and Europe, so the ASX 200 often reacts first to overnight US moves.
Common questions
What are franking credits?
Credits attached to dividends representing company tax already paid, which eligible shareholders can offset against their own tax. They mean profits are taxed once rather than twice.
Why is the ASX 200 so concentrated?
A relatively small listed market where banking and resources produced a handful of very large companies, with little large-scale domestic technology.