How Wall Street Moves Affect the ASX Open – A Guide for Australian Investors
Synopsis
Australian markets don’t open in isolation. By the time the ASX begins trading, Wall Street has already set the tone through earnings, economic data and investor sentiment. This guide explains how US markets, SPI futures, commodities, currency movements and Asian cues combine to influence the ASX open, and why the relationship isn’t always straightforward.
Australian investors start trading in a market that has been impacted by events overseas every weekday morning. By the time the ASX opens at 10:00 am AEST, the markets in the US have been closed and a full day of economic data, earnings and investor reaction has taken place.
That's why market comment is frequently prefaced with the ASX opening versus the previous day's performance on Wall Street. But it's not always simple. But knowing how these markets interact can help investors to better read the early movements and not just listen to the headlines.
Why Wall Street has a grip on the ASX
The United States is still the biggest and most powerful financial market in the world. The determinants of movements in US stocks are generally those with international impact such as interest rates, inflation, corporate earnings and growth uncertainty.
These forces cannot stop at the U.S. border. Historically, the ASX 200 has been meaningfully correlated to major U.S. indexes like the Dow Jones Industrial Average, S&P 500 and the Nasdaq Composite. On a longer time scale this correlation has frequently been in the range of 0.65 to 0.85, especially when the world markets tend to perform in a powerful manner.
This does not mean the same amount of movement every day. Instead, the sentiment towards risk globally is a clear early indicator that Australian markets can sometimes pick up on at the open, on Wall Street.
Why the Dow Jones Often Matters More Than the Nasdaq
One of the common beliefs of newer investors is that the NASDAQ index is the most relevant US index for forecasting the ASX. In reality, the Dow Jones Industrial Average is a better benchmark.
This is due primarily to the composition of the sectors. The Nasdaq is heavily weighted towards large technology companies such as Apple, Microsoft, Nvidia, Amazon, and Meta. The ASX, by contrast, is made up of financials, materials and energy firms.
The Dow Jones has a greater percentage of industrial, financial and consumer companies, which better mirrors the Australian market.
Index Sector Exposure
| Index | Largest Sector Exposure |
|---|---|
| Nasdaq | Technology |
| S&P 500 | Broad, diversified |
| Dow Jones | Industrials, financials, consumer |
| ASX 200 | Financials, materials, energy |
This means that a Nasdaq rally doesn't necessarily lead to a robust ASX open. Gains on AI-related stocks, for instance, could have little direct connection, for example, to Australian banks or mining companies.
How SPI Futures Indicate the ASX Open
SPI 200 futures are considered the best barometer of the ASX's price movement on Monday. The futures contracts are based on what the ASX 200 is expected to be worth and trade outside of regular Australian market hours.
They are quick to react and respond to global events such as Wall Street performance, hence offering a practical link between movement in the US markets and the next ASX session.
To illustrate, let's take a look at the example detailed in
Example of SPI Futures Impact
| Scenario | Market Level |
| ASX 200 previous close | 8,000 |
| Wall Street overnight | Positive |
| SPI futures level | 8,080 |
| Expected ASX open | ~8,080 |
In this case, traders expect the ASX to trade at a level around 80 points higher when trading first up. Although not infallible, they are generally thought to be the best pre-market signal provided by SPI futures.
Other Overnight Indicators That Matter
This is just the first reason. Often there are a variety of factors that experienced investors take into account before the opening of the ASX.
Commodity Prices
Australia's market is heavily weighted towards resources. Overnight changes in iron ore, oil, gold and copper prices can have a material impact on ASX-listed stocks, particularly mining and energy stocks. But if there's weak sentiment in the global equity markets, strong commodity prices can come to your aid.
AUD/USD Exchange Rate
The movement of currencies is key. In other words, a weaker AUD will have a positive impact on businesses that earn income overseas, because foreign income will be more valuable when it is translated back to AUD. Changes in US interest rates expectations can have a significant impact on currency markets prior to the start of the Australian trading day.
Asian Market Opens
Context can be gained from early trading in Asia too. What is happening in the markets in Japan's Nikkei 225 index and Hong Kong's Hang Seng index can sometimes be indicators of the reaction from investors in the region to the same signals being received globally. If everyone agrees, whether it be Wall Street or Asian markets, that the ASX opening trend looks good, that confidence is heightened.
Why the ASX Does Not Always Follow Wall Street
But the ASX has no lock-step with the US markets despite the close correlation. Offshore leads can be negated by domestic factors.
Some of the most influential events in the local economy are Reserve Bank of Australia policy decisions, inflation and employment statistics, federal budget announcements and major corporate earnings. The developments can also be dominated by sector developments, especially in commodities.
In 2021 and 2022, for instance, when iron ore prices were high, the ASX surged on a few occasions despite the weak trading in the US. The results of the sentiment survey were offset by strength from large cap mining stocks. Likewise, ASX moves occurred on a significant scale, free from Wall Street influence, on domestic inflation releases and central bank decisions in the recent past.
These differences can be enlightening and provide insight into the dynamics at play at any particular moment in time.
A Practical Pre-Market Routine
A set-up morning check can offer more transparency on market conditions prior to the trading day. Key indicators include:
- Performance of the Dow Jones, S&P 500, and Nasdaq
- SPI 200 futures levels
- Overall commodity movements for the previous day.
- AUD/USD exchange rate
- The first direction of the major Asian markets.
- Scheduled Australian economic releases
These factors only require a few minutes to review, and give a balanced view to what a single headline may provide.
Final Perspective
The correlation between Wall Street and the ASX is a result of their common vulnerability to global economic factors such as interest rates, inflation and growth prospects. The link, however, is not always direct because there are variations in the type of sectors and the nature of the economic drivers in different areas.
Investors don't need to be able to accurately forecast ASX open, just the factors that will be impacting it. This is because when combined with US data and SPI futures, commodities, currencies, and regional trends can offer a more complete and reliable framework.
By doing so, investors can better read the market and determine when they might be seeing signs of divergence and a change in the market.
Follow Inspirepreneur Magazine for daily global business news.
At Inspirepreneurs Magazine, covering entrepreneurship, business failures, and the human stories behind the world's most ambitious founders. She writes at the intersection of strategy and storytelling.
