Direct Answer
The S&P/ASX 300 is a rule-based measurement of top ~300 companies listed on the australian securities exchange by float-adjusted market cap, maintained by S&P Dow Jones Indices/ASX. Like every index it owns nothing: it is a number produced by applying a published weighting formula to a selected list of companies, revised on a schedule the provider sets.
What this index covers
The S&P/ASX 300 covers top ~300 companies listed on the australian securities exchange by float-adjusted market cap, within the Australia market. S&P Dow Jones Indices/ASX defines which securities are eligible, how they are selected from that pool, and how much each one contributes to the published number.
The name states a target of 300 companies. A target is not a guarantee of the exact count on any given day: corporate actions, dual share classes and pending additions all move the real number around it.
How constituents are weighted
Swoopr has not verified the weighting method for this index against S&P Dow Jones Indices/ASX's current methodology document, so none is stated here rather than guessed. The provider link below is authoritative.
Current S&P/ASX 300 constituents
S&P Dow Jones Indices/ASX publishes and licenses the S&P/ASX 300 constituent list. Swoopr does not republish it here. The provider's own page is the authoritative source for current membership and weights.
Related reading
- All stock market indexes: how indexes are built, weighted and revised.
- Asia-Pacific indexes: others covering the same region.
- Index concentration: measuring how much of an index sits in its largest holdings.
- Index rebalancing and inclusion effects: what happens to a stock when index membership changes.
Frequently Asked Questions
Who maintains the S&P/ASX 300?
S&P Dow Jones Indices/ASX maintains the S&P/ASX 300 and publishes the methodology document that defines its eligibility and weighting rules.
What does the S&P/ASX 300 measure?
It measures top ~300 companies listed on the australian securities exchange by float-adjusted market cap. The index is a calculated number applying a weighting formula to a selected list of companies, and it holds nothing itself.
Where can I see the current S&P/ASX 300 constituents?
S&P Dow Jones Indices/ASX publishes the current constituent list. Swoopr does not republish it, because index providers license constituent data and Swoopr holds no such licence.