Insights

How is the ASX 200 Index (ASX:XJO) share list compiled?

How does the ASX 200 Index work exactly?
The post How is the ASX 200 Index (ASX:XJO) share list compiled? appeared first on The Motley Fool Australia. –

If you’re an investor in, or at least have an abiding interest in, ASX shares, you will have no doubt heard of the S&P/ASX 200 Index (ASX: XJO).

The ASX 200 is the ASX’s most prominent share market index, and is frequently quoted alongside the older All Ordinaries Index (ASX: XAO) as an all-encompassing benchmark for the Australian share market.

If someone says, “the ASX was down 2% yesterday”, they are probably talking about the ASX 200.

But how exactly are the shares in this list compiled to give us such a good read on the share market as a whole?

It’s more complicated than you might think.

So to start off with, let’s get the elephant out of the room. Yes, the ASX 200 has… 200 companies within it. These companies represent the 200 largest shares on the ASX boards by market capitalisation. So size does matter when it comes to how this list is compiled.

So apart from market capitalisation, what other requirements need to be filled for a company to appear on the ASX 200?

How does the ASX 200 work?

Well, according to S&P Global, the company which operates the ASX 200 Index, there are a few other considerations as well. These include liquidity and whether the company is domiciled in Australia.

Investment vehicles that primarily invest in other companies’ shares, such as exchange-traded funds (ETFs), listed investment companies (LICs) or managed funds, are generally not eligible for inclusion in the ASX 200.

When determining a company’s market capitalisation, obviously this can change day to day, sometimes dramatically. As such, S&P Global uses the “daily average market capitalisation of a security over the last six months” to determine a longer-term average.

Every 3 months, the ASX 200 is rebalanced, which means that it is readjusted based on each of its constituents’ updated market capitalisations and other eligibility criteria. This inevitably means that every 3 months, some companies are kicked out of the ASX 200 and replaced with new entrants.

For example, the ASX 200’s latest rebalance was effective on 21 June 2021. This saw Orocobre Limited (ASX: ORE) added to the ASX 200, whilst Resolute Mining Limited (ASX: RSG) was kicked out.

But of the top 200 companies are selected for the ASX 200, how are they then apportioned? Well, it’s not equal. In a market capitalisation-weighted index, each company is assigned a ‘weighting’ based on its size. Thus, the larger companies (such as the ASX banks or BHP Group Ltd (ASX: BHP) are assigned a larger weighting than the smaller ones, such as Zip Co Ltd (ASX: Z1P).

What do the top ASX 200 shares look like today?

Here is a look at the ASX 200’s current 10 largest companies, and their respective ASX 200 weightings (the latter according to BlackRock):

ASX 200 Share
Current Market Capitalisation
ASX 200 Weighting

Commonwealth Bank of Australia (ASX: CBA)

$176.02 billion
8.29%

BHP Group Ltd (ASX: BHP)

$131.59 billion
6.58%

CSL Limited (ASX: CSL)

$137.82 billion
6.26%

Westpac Banking Corp (ASX: WBC)

$94.72 billion
4.44%

Australia and New Zealand Bnking GrpLtd (ASX: ANZ)

$80.73 billion
4.27%

National Australia Bank Ltd (ASX: NAB)
$90.71 billion
3.8%

Wesfarmers Ltd (ASX: WES)

$74.82 billion
3.45%

Macquarie Group Ltd (ASX: MQG)

$60.84 billion
2.61%

Woolworths Group Ltd (ASX: WOW)

$52.6 billion
2.46%

Telstra Corproation Ltd (ASX: TLS)

$47.21 billion
2.21%

Size does matter…

As you can see, the weightings generally correspond with each company’s market cap. Of course, this isn’t always perfect. You can see that BHP currently has a larger weighting than CSL, even though it has a smaller market cap as it stands today.

BHP shares have fallen steeply over the past week or so. But as the ASX 200 is only rebalanced every 3 months, we will have to wait until the next rebalance to see this new paradigm reflected in the weighting. That’s assuming BHP’s market cap remains below CSL’s until then, of course.

So now you know how the ASX 200 sausage is made, so to speak. It’s a complicated business, but one that ends up giving us an easy and fairly accurate glimpse of how the entire ASX share market is performing at any given time.

The post How is the ASX 200 Index (ASX:XJO) share list compiled? appeared first on The Motley Fool Australia.

Wondering where you should invest $1,000 right now?

When investing expert Scott Phillips has a stock tip, it can pay to listen. After all, the flagship Motley Fool Share Advisor newsletter he has run for more than eight years has provided thousands of paying members with stock picks that have doubled, tripled or even more.*

Scott just revealed what he believes could be the five best ASX stocks for investors to buy right now. These stocks are trading at near dirt-cheap prices and Scott thinks they could be great buys right now.

*Returns as of August 16th 2021

More reading

These were the worst performing ASX 200 shares last week

Here are the top 10 ASX 200 shares today

ASX 200 midday update: Cochlear & TPG sink, Inghams jumps

5 things to watch on the ASX 200 on Friday

ASX 200 drops, Redbubble soars, TWE falls

Motley Fool contributor Sebastian Bowen owns shares of National Australia Bank Limited and Telstra Corporation Limited. The Motley Fool Australia’s parent company Motley Fool Holdings Inc. owns shares of and has recommended CSL Ltd. and ZIPCOLTD FPO. The Motley Fool Australia owns shares of and has recommended Macquarie Group Limited, Telstra Corporation Limited, and Wesfarmers Limited. The Motley Fool has a disclosure policy. This article contains general investment advice only (under AFSL 400691). Authorised by Bruce Jackson.

Trade The World Anywhere & Anytime!

Mobile app platform with over 50,000 global listed securities across 12 markets (over 70% global market capitalisation), right from your Android or iOS device.

Integrated with exclusive trading idea and investment analysis tools to help you find actionable insight on virtually every financial instrument across our 12 global markets, to help you optimise your trading strategies.

Refer Your Friends

Tell your friends about Monex and gift them FREE access to our trading tools.

We respect your privacy and will only send this one email notification to your friends. 

Share With Your Friends

Share on facebook
Share on twitter
Share on linkedin

Monex Trading Tools Access and Usage Terms

The Monex Trading Tools (referred to as ‘tools’ hereafter) are available to you inside your client portal;


To activate access to the tools, you must have a verified and approved trading account and have made a deposit of at least AUD $1000.


An active and funded account with a positive trading balance is required to continue to have access to the tools;


Although the tools are available to you indefinitely, Monex Securities may at it’s discretion disable access to the tools in the future;


Monex securities reserves the right to change these terms and conditions from time to time, as it sees fit, without notice.

Important Notice
iOS & Android App - 12 International Markets & Over 70% Global Market Cap. $0 Brokerage On US Trades. Click Here!