Australian Share Market for Beginners: How the ASX Works

The Australian Securities Exchange (ASX) is Australia's primary stock exchange - the marketplace where buyers and sellers trade shares in listed companies, exchange-traded funds (ETFs), real estate investment trusts (REITs), listed investment companies (LICs), and other securities. It operates Monday to Friday, 10:00am–4:00pm AEST/AEDT (pre-open auction from 7:00am).

• What you own when you buy shares: A share represents fractional ownership of a company. Buy 100 shares in BHP Group (ASX: BHP) and you own a tiny portion of one of the world's largest mining companies. As an owner, you are entitled to a proportional share of dividends declared, voting rights at AGMs, and a proportional claim on net assets in a winding up.
• The ASX 200: The S&P/ASX 200 is the benchmark index of the 200 largest companies listed on the ASX by market capitalisation (total value of all shares on issue). As at 2025, the ASX 200 is dominated by financials (roughly 30% - the four major banks), materials (mining companies ~25%), and healthcare (~10%). Understanding the index composition matters: an ASX 200 ETF is not particularly diversified across sectors - it is heavily weighted to banks and miners.
• Market capitalisation and index weighting: In a market-cap weighted index, larger companies have more influence. Commonwealth Bank (CBA) - the largest ASX company - at a market cap of ~$230 billion represents a far larger portion of the ASX 200 than a small-cap company at $500 million. ETFs tracking the index buy each company in proportion to its market cap.
• Settlement - T+2: When you buy or sell ASX shares, the trade settles two business days later (T+2). You must have the funds in your broker account by settlement date. On a sale, you receive the proceeds on T+2.
• Dividends and ex-dividend dates: Companies declare dividends periodically (most Australian blue chips pay semi-annually). To receive a dividend, you must hold the shares on the record date. The ex-dividend date is typically the trading day after the record date - shares bought on or after the ex-dividend date do not receive that dividend. Shares usually fall by approximately the dividend amount on the ex-dividend date.

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Australia's settlement system - the Clearing House Electronic Sub-register System (CHESS) - is unique globally and gives retail investors direct legal ownership of shares. Not all brokers use CHESS, and the difference matters significantly.

• CHESS-sponsored accounts: When you buy shares through a CHESS-sponsored broker, you are issued a Holder Identification Number (HIN). Your shares are registered directly in your name on the ASX CHESS subregister - you are the legal owner. If the broker fails, your shares are protected because they are registered in your name, not the broker's. CHESS-sponsored brokers: CommSec, nabtrade, Bell Direct, Selfwealth.
• Custodial (nominee) accounts: Many newer and cheaper brokers (Stake, Superhero, Pearler's foreign holdings) hold shares in a custodial structure - the broker (or its nominee company) is the legal owner; you are the beneficial owner. If the broker becomes insolvent, you may face delays or losses in recovering your shares, depending on how client assets are segregated. Custodial structures are common internationally (all US stock ownership for Australians is custodial) and are generally well-regulated, but carry additional counterparty risk.
• HIN portability: With a CHESS-sponsored account, your HIN is portable - you can move your shareholding to a different broker by transferring the HIN. With a custodial broker, moving means selling (triggering CGT) and rebuying, or a complex in-specie transfer.
• Tax reporting: CHESS-sponsored brokers issue annual tax reports directly tied to your HIN. Custodial brokers also provide tax reports, but these are generated internally rather than from the ASX register. Both are generally adequate for tax return purposes.
• Practical advice: For core long-term Australian equity holdings, use a CHESS-sponsored broker for the legal ownership benefit. For US or international shares (where CHESS does not apply regardless), custodial is the only option - compare the platform fees, FX rates and security practices of different providers.

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When you place a trade through a broker, you choose how the order is executed. Getting this right protects you from paying more than you intend - especially for less liquid securities.

• Market order: Instructs the broker to buy or sell at the best available price immediately. Execution is fast and certain. Risk: in a volatile market or for an illiquid stock, the price you get may differ materially from the last traded price (slippage). For large-cap ASX 200 stocks with tight bid-ask spreads, market orders are generally fine.
• Limit order: You specify the maximum price you are willing to pay (buy) or the minimum you will accept (sell). The order only executes if the market reaches your price - or better. Protects you from slippage. Risk: the order may not execute at all if the market does not reach your limit. For ETFs, illiquid stocks, or large orders, always use a limit order.
• Bid-ask spread: The bid is the highest price a buyer will pay; the ask is the lowest price a seller will accept. The difference is the spread - your immediate cost of entry. For liquid stocks like CBA or BHP, the spread is typically 1–2 cents (negligible). For small-cap stocks or illiquid ETFs, the spread can be 0.5–2% - a real cost that compounds with frequent trading.
• After-hours and pre-market: The ASX runs an opening single-price auction (10:00–10:10am) and closing auction (4:00–4:10pm). Orders placed outside market hours queue for execution at the next market opening. There is no extended-hours trading on the ASX (unlike US markets).

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Brokerage fees erode returns - especially on small trades. Compare total costs including brokerage, FX conversion fees (for international shares), and annual platform fees before choosing a broker.

• CommSec: Australia's largest retail broker by user numbers. CHESS-sponsored. Brokerage: $10 for trades up to $1,000 / $19.95 up to $10,000 / 0.12% above $10,000. Full-featured platform, integrates with CommBank accounts. Higher brokerage than newer platforms.
• Selfwealth: CHESS-sponsored. Flat $9.50 brokerage per trade regardless of size - a significant advantage on larger trades. No monthly platform fee. Basic charting. Good for buy-and-hold investors.
• Superhero: Custodial. $2 brokerage for ETF trades, $5 for shares. No minimum trade size. Good for regular small investments. CHESS-sponsored option also available for an additional fee.
• Pearler: CHESS-sponsored for Australian holdings. Focused on long-term index investing with autoinvest features. $6.50 per ASX trade. Community features oriented toward passive investors.
• nabtrade: CHESS-sponsored. $14.95 up to $5,000 / $19.95 up to $20,000. Integrates with NAB banking. Access to international markets.
• Getting started - minimum practical steps: (1) Choose a broker and create an account (requires 100-point ID verification). (2) Link your bank account and deposit funds. (3) Research your first investment - for beginners, a broad index ETF (e.g. A200 for Australian equities, VGS for global, or DHHF for a globally diversified single-fund option) removes individual stock selection risk. (4) Place a limit order at or near the current ask price. (5) Set up a regular transfer and autoinvest if available - automation removes the temptation to time the market.
• Franking credits - the Australian advantage: Australian companies pay 30% corporate tax on profits before distributing dividends. Franked dividends carry credits representing this tax already paid. At your tax return, the grossed-up dividend (cash + credit) is assessable income, but the franking credit reduces your tax payable dollar for dollar. If your marginal rate is below 30%, the excess credit is refunded to you. SMSF funds in pension phase receive a full cash refund of all franking credits - a powerful income stream for retirees.

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