S&P/ASX Index Methodology How Australian Indices Are Constructed And Maintained S&P/ASX Index MethodologyHow Australian Indices Are Constructed And Maintained This document outlines the methodology framework that guides Standard & Poor’s in the construction and maintenance of the S&P/ASX indices.
S&P/ASX 300
The S&P/ASX 300 is comprised of the S&P/ ASX 200 plus up to an additional 100 stocks.
A representative from Standard & Poor’s is the chairman of the Index Committee. Meetings are held on a quarterly basis as well as on an as- needed basis should unusual corporate events warrant. The Index Committee reserves the right to use discretion to include, exclude, adjust, or postpone the inclusion of a stock, the shares, and the Investable Weight Factor (IWF) of a stock.
ELIGIBILITY
In order to be eligible for inclusion in any of the S&P/ASX indices stocks must meet certain criteria:
Listing
Only stocks listed on the Australian Stock Exchange will be considered for inclusion in any of the S&P/ASX indices. New listings will only be considered for inclusion once the Standard & Poor’s Index Committee has had sufficient time to quantitatively analyse the performance of the stock.
Size
Stocks are assessed based on the average of their previous six-month day- end free float adjusted market
capitalisation. In times of high volatility the current market capitalisation of the stock may also be considered.
Liquidity
Only stocks that are actively and regularly traded are considered for inclusion in any S&P/ASX index. A stock’s liquidity is measured relative to its size peers. The minimum relative liquidity for purposes of inclusion will depend upon the size of the company. Relative liquidity is calculated as follows:
Relative liquidity = stock median liquidity/market liquidity
Stock median liquidity is the median daily liquidity for each stock over six months. Daily liquidity for each stock is the daily value traded divided by day-end market capitalisation adjusted for free float.
Market liquidity is determined using the weighted average of the stock median liquidities of the largest 500 domestic stocks. The six-months average market capitalisation used as part of the market capitalisation criteria is used for this purpose.
INDEX DELETIONS & ADDITIONS
Quarterly Rebalance
Constituents are rebalanced quarterly to ensure adequate market capitalisation and liquidity. Both market capitalisation and liquidity are assessed using the previous six months’ worth of data. Quarterly rebalance changes take effect on the third Friday of December, March, June, and September. The S&P/ASX 300, unlike the other indices, is rebalanced every six months, with changes taking effect on the third Friday of March and September.
Intra Quarter
The most common reason for deleting a stock from an S&P index intra quarter is acquisition by another company. Additionally, stocks may be deleted for the following reasons:
Voluntary Administration
A company is removed from the index immediately after filing for voluntary administration.
Restructuring
Each company’s restructuring plan is analysed in depth. The restructured company and any spin-offs are reviewed for index inclusion or exclusion.
ANNOUNCEMENT OF INDEX CHANGES
Quarterly rebalance announcements are made approximately 10 business days prior to the changes taking effect.
Intra quarter changes are announced approximately five days prior to the implementation of anticipated corporate events whenever practical, bearing in mind that the timing of such events is occasionally uncertain.
Announcements for removals and replacements of companies are made via a press release to the ASX Company Announcements Platform (CAP), where Standard & Poor’s Index Services has its own company code: ZSP.
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