What Does The ASX 50 Include? An Explanation Of What Goes Into Australia's Most Significant Market Cap Stock Index.
Around 62 percent of the value invested in the Australian stock exchange can be found within the top 50 biggest stocks trading on the ASX. Understanding this provides an initial insight into what defines the ASX 50 – it is not a selection based on quality or any other standard. Instead, the threshold is set at market capitalization levels approaching $5 billion.
How the index really works
The S&P/ASX 50 Index is based upon the fifty biggest firms on the Australian Securities Exchange measured by float adjusted market capitalization, taking account of the percentage of shares available for trading rather than all shares issued. The index is reviewed quarterly based on six month data prior to the period, usually rebalancing occurring during March, June, September and December. Should anything happen mid-quarter requiring an alteration to the index composition, such as a delisting event or takeover, at least two business days notice will be provided.
All 50 components make up part of the larger indices of the ASX 100, ASX 200, and ASX 300. The indices build up layers surrounding the ASX 50, which represents the largest cap within the group. While there will be overlap with the next biggest index of the ASX 50 being nested within the ASX 20, there is a real difference between the two regarding the composition of the sectors.
In contrast to the ASX 20 index, dominated almost exclusively by the sectors of Financials and Materials, the ASX 50 covers every one of the eleven GICS sectors. It is this broad diversification in the coverage of sectors across the board that makes the ASX 50 index attractive to fund managers instead of the ASX 20.
What's inside the Index
While the list may change quarterly due to market cap considerations as per the rules of the index, this makeup has held true for many years now, giving an excellent cross-section of various parts of the economy.
In finance we find the four largest banking stocks along with Macquarie Group. Materials include BHP, Rio Tinto, Fortescue Metals, Amcor, and Evolution Mining. Health care includes CSL and Cochlear. Consumer staples are covered by Coles and Woolworths while Aristocrat Leisure stocks provide coverage of consumer discretionary. Brambles stock is used to reflect industrial operations. Communication services are reflected through CAR group. Computershare provides IT exposure although this category has changed substantially in recent years due to WiseTech Global gaining market capitalization sufficient to make the cut. Energy stocks include Woodside Energy and Santos. Finally we have Goodman Group providing real estate exposure and Transurban covering industrial infrastructure assets.
What sets the ASX 50 apart from the ASX 20 is diversity. When changes in banking sentiment or iron ore prices can cause wild swings for the ASX 20, the composition of the ASX 50 across health care, technology, consumer stocks, and infrastructure as well as resource stocks and financials makes it much more representative of large caps in Australia as a whole.
Due to periodic reassessment of the list each quarter and deletions of companies due to corporate actions such as Newcrest Mining merging with Newmont to exit 2023, there is no substitute for looking up an active list rather than relying upon an outdated list.
The live ASX 50 provides an updated listing of the current top fifty Australian blue chip stocks.
What Fund Managers Use the ASX 50 For
Fund managers use the ASX 50 in order to measure their own fund against the performance benchmarks to determine if they add anything worthwhile beyond that offered by the overall movement of the market itself.
When measuring the performance of funds dedicated to large and liquid Australian equities, the fund will usually compare itself against either the ASX 50 itself or a variation thereof. This provides insight into how the fund manager's selection of stocks contributed any additional gains above and beyond that offered by just following the market index.
Liquidity is the second key factor behind the use of this particular index by institutions. For large funds, especially very large funds, it becomes critical to trade in securities where buying or selling does not impact the stock price due to its own actions. This requires trading in companies which are truly large enough to handle substantial volume. Unlike other indices which focus purely on market capitalization or company size, the inclusion requirement criteria used for construction of the ASX 50 places an importance on liquidity, allowing such funds to implement strategies based on them effectively.
There is also an associated product range that directly accesses this index. One such example is the SPDR S&P/ASX 50 Fund. Given that the constituent companies in the ASX 50 represent a vast majority within the overall membership of the ASX 200 and 300 indices due to their method of selection, any Australian equity ETF will have substantial weightings to ASX 50 companies, regardless of whether they are actively trying to replicate the index. For a passive investor looking at their exposure to Australian equities in general, knowing the makeup of the ASX 50 is almost like holding them directly.
Interpreting the Index Well
Practical utility in looking at the ASX 50 rather than an even narrower index such as the ASX 20 comes from the greater sectoral diversification giving it a much more accurate representation of Australia’s major stocks index-wise. If something happens in the banking or mining sectors, it does not blow out quite as strongly in the ASX 50 as the ASX 20 because there is enough representation from health care, technology, consumer goods/services and infrastructure stocks. However, it remains an index limited to large caps only by its nature and tells us absolutely nothing about the performance of smaller/mid-cap companies. These issues remain relevant but in lesser form due to a larger denominator base. The key is recognizing what you are really dealing with – it is not a broad-based reflection of the Australian stock market overall but the very core of Australian equity capital management.