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The Australian Securities Exchange (ASX) is one of the world's top 20 exchanges, hosting over 2,000 listed companies worth approximately $2 trillion.
Quick Facts:
The ASX operates as Australia's primary stock exchange, combining market trading, clearinghouse operations, and trade and payment settlement.
It represents roughly 80% of the Australian equity market value through its flagship ASX 200 index.
2,000+ companies and 300+ ETFs are listed on the exchange, spanning from mining giants to tech innovators.
How does the ASX work?
The ASX combines three critical functions in one system.
As a market operator, it provides the electronic platform where buyers and sellers meet. Trading occurs through a sophisticated computer system that matches orders in milliseconds, replacing the traditional floor-based trading that once defined stock exchanges globally.
The exchange also acts as a clearinghouse, ensuring trades settle correctly. When you buy shares, the ASX guarantees the transaction completes, managing the transfer of securities and funds between parties.
Finally, it serves as a payments facilitator, processing the money flows that accompany each trade. This integrated approach reduces settlement risk and keeps the market running smoothly.
What are ASX trading hours?
The ASX operates from 10:00am to 4:00pm Sydney time (AEST/AEDT) on business days, with a pre-open phase from 7:00am.
Stocks open alphabetically in staggered intervals starting at 10:00am, followed by continuous trading until the closing auction at 4:00pm.
The exchange observes Australian public holidays and adjusts for daylight saving time between October and April, which can affect coordination with international markets.
ASX trading hours by time zone
Phase
Sydney (AEST)
Tokyo (JST)
London (BST)
New York (EDT)
Pre-Open
7:00am - 10:00am
6:00am - 9:00am
10:00pm - 1:00am
5:00pm - 8:00pm*
Normal Trading
10:00am - 4:00pm
9:00am - 3:00pm
1:00am - 7:00am
8:00pm - 2:00am*
Closing Auction
4:00pm - 4:10pm
3:00pm - 3:10pm
7:00am - 7:10am
2:00am - 2:10am
*Previous day. Note: Times shown assume daylight saving time in effect (AEST/BST/EDT). Japan does not observe daylight saving. Time differences vary when regions switch between standard and daylight saving at different dates.
Top ASX Indices
S&P/ASX 200
This is the exchange's flagship index. It tracks the 200 largest companies by market capitalisation and represents approximately 80% of Australia's equity market.
It serves as the primary benchmark for most investors and fund managers and is rebalanced quarterly to ensure it reflects the current market leaders.
The ASX also breaks down into 11 sector-specific indices, allowing investors to track performance in areas like financials, materials, healthcare, and technology.
These indices can help identify which parts of the Australian economy are strengthening or weakening.
ASX sector breakdown as of 31 December 2025. Source: S&P Global
Financials dominates as the largest sector, driven by Commonwealth Bank, NAB, Westpac, and ANZ. These banking giants provide lending, wealth management, and insurance services across Australia.
Materials ranks second, led by mining powerhouses BHP and Rio Tinto. This sector extracts and processes resources, including iron ore, coal, copper, and gold.
Consumer Discretionary includes retailers, media companies, and hospitality groups that benefit when household spending rises.
Industrials encompasses construction firms, airlines, and professional services businesses.
Healthcare features companies like CSL, a global biotech leader, and Cochlear, which produces hearing implants.
Real Estate features property developers and Real Estate Investment Trusts (REITs) that own and manage commercial and residential assets.
Communication Services includes telecommunications providers like Telstra alongside media and entertainment companies.
Energy tracks oil and gas producers (many renewable energy companies typically fall under utilities).
Consumer Staples covers essential goods providers like supermarkets and food producers.
Information Technology includes software developers and IT services firms.
Utilities covers electricity, gas, and water suppliers, including renewable energy.
ASX Symbol
Sector
Top Stocks
% of ASX 200
XFJ
Financials
CBA, NAB, ANZ
33.4%
XMJ
Materials
Orica, Amcor, BHP
23.2%
XDJ
Consumer Discretionary
Harvey Norman, Crown
7.4%
XNJ
Industrials
Qantas, Transurban
7.4%
XHJ
Health Care
ResMed, CSL and Cochlear
7.1%
XRE
Real Estate
Mirvac, LendLease, Westfield
6.7%
XTJXIJ
Communication Services
Telstra, Airtasker
3.7%
XEJ
Energy
Santos, Woodside
3.6%
XSJ
Consumer Staples
Woolworths, Westfarmers
3.4%
XIJ
Information Technology
Dicker Data, Xero
2.5%
XUJ
Utilities
AGL, APA Group
1.4%
Data accurate as of 31 December 2025
Top ASX companies
Three companies consistently lead the S&P/ASX 200 by market capitalisation.
Commonwealth Bank (Mkt cap: A$259 bln)
Commonwealth Bank holds the top position on the ASX as Australia's biggest lender.
Founded in 1911 and fully privatised by 1996, CBA offers retail banking, business lending, wealth management, and insurance.
Its performance often signals the health of the domestic economy.
BHP Group (Mkt cap: A$241 bln)
BHP Group stands as the world's largest mining company.
Its diversified portfolio spans iron ore, copper, coal, and nickel operations globally.
It serves as a bellwether for Australian commodity markets.
CSL Limited (Mkt cap: A$182 bln)
CSL Limited leads the Australian healthcare sector as a global biotech firm.
Established in 1916, CSL develops treatments for rare diseases and manufactures influenza vaccines.
The company demonstrates Australian innovation competing on the world stage.
The ASX serves as a vital mechanism for capital formation in Australia. It tends to provide price signals that reflect market expectations.
When share prices rise, it suggests optimism about economic conditions. Falling markets may indicate concerns about future growth.
Australian companies raise funds through initial public offerings and follow-on share sales on the ASX, using proceeds to expand operations, fund research, or pay down debt.
Investors in these shares benefit from potential capital gains and dividend income. Many Australians build retirement savings through superannuation funds that invest heavily in ASX-listed companies.
Employment in financial services also depends partly on a healthy stock market. Brokers, analysts, fund managers, and supporting roles exist because of active capital markets.
Key takeaways
The ASX functions as a market operator, clearinghouse, and payments facilitator, providing the infrastructure that enables capital formation and supports retirement savings for millions of Australians.
Its flagship index, the S&P/ASX 200, tracks the 200 largest companies and captures about 80% of market capitalisation, while the All Ordinaries index covers the top 500.
Financials and Materials dominate the exchange, led by Commonwealth Bank, BHP, and CSL, reflecting Australia's strength in banking and resources.
US earnings season is where the market gets its cleanest burst of new information. For Australians, it usually lands while the country is asleep. This is not just “US company news”. It is the scoreboard for the Nasdaq, the S&P 500, and risk appetite more broadly, with spillover into SPI futures, the AUD, and sector mood at the ASX open.
What this guide covers
The four-wave rhythm (why volatility clusters in predictable months)
The order of play (banks → tech → retailers) and what each group tends to reveal
Before market open (BMO) vs after market close (AMC)
The few lines markets care about (surprise vs expectations, and the forward reset)
How earnings information can flow through to Australia via futures, FX, and sector sentiment
US earnings season basics
Earnings season is the 4 to 6-week window after each quarter when most US-listed companies report a new set of numbers and a new story.
Calendar rhythm and clustering
Earnings does not arrive as a smooth drip. It typically arrives in four recurring waves. Most US reporting clusters around January, April, July, and October. Each wave covers the prior quarter, which is why markets spend the lead-up period building expectations, then reprice quickly as numbers and guidance hit.
The sequence is familiar: banks open, tech dominates the middle, retailers close. That order matters because each group updates a different part of the macro story. If you only track one set of reports, make it the Magnificent 7 — here’s the Mag 7 earnings calendar for 2026 (Aussie-friendly timing)
Source: GO Markets
Time zones: the two windows
For Australians, the key is when the first move hits.
AMC (after market close): often Sydney and Melbourne morning, sometimes near the ASX open
BMO (before market open): often late night, with the initial reaction while Australia sleeps
Daylight saving shifts timings, but the structure is consistent: two windows, two different liquidity conditions.
How the market digests an earnings event
Earnings is rarely a single reaction. It is a sequence.
Headline release (EPS and revenue versus consensus)
Immediate price discovery (often in after-hours or pre-market liquidity)
Call and Q&A (guidance, margins, and demand tone get tested)
Next US cash session (follow-through, reversals, broader positioning)
Australia opens into the aftershock (futures, FX, and sector mood already set)
Translation: volatility often clusters around reporting windows because the calendar can concentrate new information and repricing.
Expectations: the scoreboard the market uses
Markets do not price “good” or “bad” in isolation. They price the gap versus expectations, then adjust the forward story. That is why the same quarter can look strong on paper and still disappoint if it lands below what the market had already baked in.
Most headlines boil down to three checks. First, actual results versus consensus. Second, actual results versus what the company previously guided. Third, quality and durability. That tends to show up in margins, the mix across segments, and whether cash flow backs up the earnings number.
Guidance: the forward reset
Guidance is where the narrative can change without the quarter changing. A company can deliver the past cleanly, then move the goalposts for what comes next. That forward reset is often what drives the bigger repricing.
In practice, guidance usually lands in a few buckets. Revenue or EPS outlook sets the top-line and earnings path. Margin outlook tells you how confident management is about costs and pricing. Capex language signals how heavy the investment cycle is likely to be. Capital return talk, including buybacks, is a read on balance sheet posture and priorities.
Translation: markets trade forward narratives. Guidance is the mechanism.
The call: where tone becomes data
Prepared remarks are polished. The call is where the market stress-tests the story. The Q&A is where the edges show up, because that is where analysts push on the parts that matter and management has to answer in real time.
Listen for the tells. Demand language can shift from broad to patchy. Pricing can move from power to pressure. Margin confidence can sound steady or start to carry caveats. And the “we are not breaking that out” moments matter too. What management avoids can be as informative as what it highlights.
Key takeaways
Earnings season clusters in four waves (January, April, July, October), so volatility often arrives in blocks.
The sequence matters. Banks open the read on confidence, tech steers index tone, retailers often close the consumer chapter.
From Australia, BMO and AMC are the two windows that shape what you wake up to.
Markets trade surprise vs expectations, then the forward reset via guidance and call tone.
The spillover typically shows up through futures, FX, and sector sentiment before the ASX open.
Glossary (quick definitions)
EPS: earnings per share
Consensus: the market’s compiled estimate set
Guidance: management’s forward-looking outlook ranges/comments
Margins: profitability as a percentage of revenue
Capex: capital expenditure (investment spend)
BMO/AMC: before market open / after market close (US reporting labels)
After-hours / pre-market: trading sessions outside regular US cash hours
Correlation: how tightly assets move together (often rises in macro or de-risking periods)