When placing a Hong Kong stock order, consider three questions: what price you want, how quickly you need to trade, and what should happen to any unfilled part of the order. This guide covers seven common order types and trading methods, including limit, market and at-auction orders, as well as odd-lot trading and short selling. Brokers may offer different features or use different names, so check their rules before placing an order. Prices and trading scenarios in this article are illustrative, not live quotes.

Rules checked: 24 September 2026. The exchange rules discussed here have been checked against official HKEX information. For subsequent changes, refer to the latest HKEX publications and your broker's execution policies.

1. Limit orders: specify your price

A limit order specifies a trading price and suits investors with a clear buying or selling price in mind. Under HKEX's definition of a standard limit order, matching takes place only at the specified price. A broker may use a similar name for a feature that submits an enhanced limit order or executes differently, so check how the feature works.

Key features

• For a purchase, specify the price you are willing to pay
• For a sale, specify the price you are willing to accept
• You choose the order price, but there is no guarantee the order will be filled, and the shares can still fall in value after you buy them

Example

Suppose Tencent Holdings (700.HK) is trading at HK$500 and you want to buy 100 shares at HK$498. You could submit a limit order at HK$498. Whether it fills depends on matching sell orders at that price and the orders ahead of yours in the queue. Even if the last traded price reaches HK$498, your order will not necessarily be filled.

Points to check

• Suitable when you are willing to wait for your target price
• Check bid and ask prices and available quantities, not just the last traded price
• If your price is not met or there are too few shares available, the order may remain unfilled or fill only in part

2. Market orders: prioritise prompt execution

With a market order, you generally do not specify an execution price. Your broker seeks to execute the order at available market prices. As explained in HKEX's trading mechanism overview, the exchange directly accepts limit, enhanced limit and special limit orders during the continuous trading session. How a broker converts and executes its market-order instructions depends on that broker's rules.

Key features

• Aims for prompt execution, but does not guarantee an immediate or complete fill
• The execution price may differ from the quote you saw, and shares may trade at several prices
• The outcome depends on available buy and sell quantities, price movements and the broker's price-protection rules

Example

Suppose you want to sell your HSBC Holdings (5.HK) shares promptly using your broker's market-order feature. The order may first match buyers at the highest available bid. If there are not enough buyers at that price to fill your order, the remaining shares may sell at lower prices, subject to your broker's rules. The highest bid on your screen is therefore not a guaranteed price for the entire order.

Points to check

• Decide whether you are comfortable trading at a different price from the one you expected
• Check the bid-ask spread and available quantities; active trading does not eliminate price risk
• Be especially careful around major announcements or sharp market moves, when seeking speed can come at the expense of price

3. At-auction orders: participate in opening or closing auctions

At-auction orders are used for eligible securities during the pre-opening and closing auction sessions. They have no specified price and are matched together at the auction. If you also want a price limit, consider a different order type: the at-auction limit order.

Key features

• If matched, the order executes at the final Indicative Equilibrium Price, which is not known when you submit it
• At-auction orders have matching priority over at-auction limit orders, but a full fill is still not guaranteed
• Suitable for investors who need to participate in an auction and can accept uncertainty about the final execution price

Example

Suppose you want to buy Alibaba (9988.HK) shares in the pre-opening auction. You can submit an at-auction order during a period when order entry is permitted. Under HKEX's pre-opening session arrangements, the session runs from 9:00 to 9:30 a.m. Hong Kong time, with matching at a random time between 9:20 and 9:22 a.m. After matching, orders cannot be entered, amended or cancelled until 9:30 a.m. Execution depends on the final Indicative Equilibrium Price and matching quantities; submitting an order does not guarantee a purchase at the opening price.

Points to check

• Check that the security is eligible for the relevant auction and confirm your broker's order-entry times
• Consider an at-auction limit order if you need to set a maximum buying price or a minimum selling price
• Before submitting an order, check when you can amend or cancel it during each auction phase

4. Enhanced limit orders: match across price levels within your limit

An enhanced limit order sets a price limit while allowing matching across several price levels. A purchase cannot execute above your specified price, and a sale cannot execute below it. Any unfilled shares remain in the order book at your specified price. See HKEX's explanation of enhanced limit orders for the matching range and treatment of unfilled quantities.

Key features

• Can match orders at up to 10 price levels, starting from the best available price and extending up to nine price increments away, without trading at a price worse than your limit
• Any unfilled quantity becomes a standard limit order in the queue at your specified price
• Your limit price must also meet the exchange's quotation rules; a price outside the permitted range will not be accepted

Example

Suppose China Mobile (941.HK) is quoted at HK$50 and you are willing to pay up to HK$50.5. Before submitting an enhanced limit order, check that HK$50.5 is permitted under the prevailing quotation rules; the order could be rejected if that limit falls outside the allowed range. If the order is accepted, shares can be bought within the permitted matching range at no more than HK$50.5. Any unfilled quantity remains on the book at HK$50.5.

Points to check

• Useful when you want the order to be filled promptly while keeping a price limit
• Check quantities at different price levels to assess the possible execution prices for the whole order
• Monitor unfilled orders and review them promptly if your trading plan changes

5. Special limit orders: cancel any unfilled quantity

A special limit order can execute at your specified price or better. Any unfilled quantity is automatically cancelled rather than left on the book. As described in HKEX's explanation of special limit orders, the order can be partially filled; it does not automatically require all shares to be bought or sold together.

Key features

• Can match orders at up to 10 price levels without trading at a price worse than your limit
• Any quantity that can be matched is filled and the rest is cancelled; if nothing can be matched, the entire order is cancelled
• All-or-nothing is a separate condition requiring the entire order to be filled; check whether your broker supports it

Example

Suppose you submit a special limit order to buy 1000 shares of Ping An Insurance (2318.HK). If only some of those shares are available at your limit or better within the permitted matching range, those shares can be bought and the rest of the order is cancelled. This does not guarantee that you will either buy all 1000 shares or buy none.

Points to check

• Useful when you want to trade against currently available quotes without leaving an order on the book
• Decide beforehand whether a partial fill is acceptable
• Check the executed quantity afterwards; do not mistake a cancelled remainder for an order still awaiting execution

6. Odd-lot orders: trade less than one board lot

An odd lot is a holding of fewer shares than one board lot. As explained in HKEX's guidance on board lots and odd-lot trading, Hong Kong stocks do not have a universal board lot size. Check the trading unit for the particular security before deciding whether your holding is an odd lot.

Key features

• Allows you to deal with holdings below one board lot, subject to the services your broker offers
• Odd-lot prices may differ from board-lot prices, and liquidity may be lower
• Often used to deal with odd lots arising from share distributions or corporate actions, or to adjust holding sizes

Example

Suppose a stock has a board lot size of 100 shares and you own 90. Those 90 shares form an odd lot. If your broker supports the transaction, you can sell them through its odd-lot service without first buying another 10 shares to make a full board lot. Check the stock's current board lot size, odd-lot quote and trading fees before proceeding.

Points to check

• Check whether your broker supports odd-lot purchases, sales or both, and how to place the order
• Useful for managing holdings below one board lot, but costs still matter even for small trades
• Compare the actual quote and fees, paying particular attention to minimum charges on small trades

7. Covered short selling: borrow and sell, then buy back and return

Covered short selling involves arranging to borrow shares and selling them, then buying shares back later to return to the lender. Under HKEX's regulated short-selling requirements, trades must meet conditions concerning designated securities, borrowing arrangements and selling prices. Not every stock can be shorted, and not every brokerage account provides this service.

Key features

• Buying back below the selling price may generate a gain, but relevant costs must still be deducted
• Costs can include stock-borrowing and trading fees, plus applicable interest and other charges
• A rising share price causes losses; for a short position in shares without a hedge, potential losses from price increases are theoretically unlimited

Example

Suppose you expect Xiaomi (1810.HK) shares to fall and have checked that the stock is eligible for short selling and that you meet the current borrowing and other requirements. You could borrow the shares and sell them. If you later buy them back at a lower price and return them, your actual gain is the price difference after costs. If the price rises instead, buying back becomes more expensive and you may lose money.

Points to check

• Can help offset some risks in a portfolio, but how well it works depends on the portfolio
• A bearish view alone is not enough; assess borrowing costs and how long you can maintain the position
• Understand the margin requirements, when you may need to add funds, and when borrowed shares must be returned. Plan how you will close the position

8. Putting it into practice

Before choosing an order type, understand its price limits, whether it is likely to be filled, and what happens to any unfilled shares. If you are new to Hong Kong stocks, start with these points:

• Explore limit-based orders when price is a priority. When you need prompt execution, also assess the risk of a different execution price.
• Check bid-ask spreads and available quantities rather than using only the last traded price to estimate the cost of the whole trade.
• Distinguish enhanced limit orders from special limit orders: the former generally keep unfilled quantities on the book, while the latter cancel them.
• Before joining an auction, check when orders can be entered, amended or cancelled, and understand how at-auction and at-auction limit orders differ.
• Before trading odd lots or short selling, check your broker's supported services, fees and requirements.

Brokers may offer additional conditional orders or automated order features. Similar names do not necessarily mean identical execution rules. Before using a new feature, understand what triggers it, which order type it actually submits and how it handles any unfilled quantity.

After placing an order, check its status and distinguish between submitted, partially filled, fully filled and cancelled. The right order can help you carry out a trading plan, but it cannot guarantee execution or investment returns.