At-auction Limit Order (AUO)
At-auction Order (AUC)(Applicable to Sell Order Only)
Enhanced Limit Order (ELO)
Market Order (MO)
Indicative Equilibrium Price (IEP)
Indicative Equilibrium Volume (IEV)

At-auction Limit Order (AUO)

An At-auction Limit Order is an order with a specified price input during the Pre-opening Session. A Buy Order with a specified price higher than or equal to the final Indicative Equilibrium Price (IEP), or a Sell Order with a specified price lower than or equal to the final Indicative Equilibrium Price will be matched at the final Indicative Equilibrium Price. Any unfilled At-auction Limit Order in Pre-opening Session will be converted to Limit Order and carried forward to the Continuous Trading Session. If the order remains unfilled in the Continuous Trading Session and it is within the permissible price limit, it will be automatically carried forward from Continuous Trading Session to the Closing Auction Session. The system will treat all such orders as at-auction limit orders.
The above information shall be subject to the latest announcement made by the HKEx.
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At-auction Order (AUC) (Applicable to Sell Order Only)

An At-auction Order is an order with no specified price and enjoys a higher matching priority than an At-auction Limit Order (AUO). Once an At-auction Order is entered into the trading system during the Pre-opening Session or Closing Auction Session, it will be matched at the final Indicative Equilibrium Price (IEP). Any unfilled At-auction Order will be cancelled automatically before the commencement of the Continuous Trading Session or after market closes. Please note that the final trade price (i.e. the final Indicative Equilibrium Price) is not known at the time of order input and may not fall within or may largely deviate from your expected price range.
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Enhanced Limit Order (ELO)

ELO will allow matching of up to 10 price queues (i.e. the best price queue and up to the 10th queue at 9 spreads away) at a time provided that the matched price is equal to or better than the limit price. The sell order price of an ELO can be matched up to 9 spreads lower than the current bid price but not a price of 10 spreads (or more) below the current bid price. The buy order price can be matched up to 9 spreads higher than the current ask price but not a price of 10 spreads (or more) above the current ask price. Any unfilled quantity of the ELO after matching will be converted to a typical Limit Order at the limit price specified previously for further matching.
Example 1 (for illustration only):
Customer has placed an Enhanced Limit Order to buy 20,000 shares of a stock at HKD8.00 each.
The Bank will calculate the required transaction amount and trading related charges based on the customer's order price (i.e. HKD8.00) and the sum will be withheld from the customer's available investment amount. The Bank will submit the order to the market for matching once up to the 10 best price queues at prices equal to or lower than the customer's buy order price (i.e. HKD8.00).
Scenario A
The price queues in the market:
Ask Price (HKD) Quantity Filled quantity (Buy)
7.91 1,000 1,000 shares @HKD7.91
7.92 2,000 2,000 shares @HKD7.92
7.93 2,000 2,000 shares @HKD7.93
7.94 3,000 3,000 shares @HKD7.94
7.95 2,000 2,000 shares @HKD7.95
7.96 3,000 3,000 shares @HKD7.96
7.97 2,000 2,000 shares @HKD7.97
7.98 1,000 1,000 shares @HKD7.98
7.99 1,000 1,000 shares @HKD7.99
8.00 4,000 3,000 shares @HKD8.00
8.01 5,000 Total: 20,000shares
Transaction Result: The Enhanced Limit Order is fully executed by buying all 20,000 shares after matching with the 10 best price queues in the prevailing market.
Scenario B
The price queues in the market:
Ask Price (HKD) Quantity Filled quantity (Buy)
7.90 1,000 0 share
7.91 1,000
7.92 2,000 Unfilled quantity (Buy)
7.93 2,000 20,000 shares
7.94 3,000
7.95 2,000
7.96 3,000
7.97 2,000
7.98 1,000
7.99 1,000
8.00 4,000
Transaction Result: Since the customer's order price (i.e. HKD8.00) is higher than the current ask price (i.e. HKD7.90) for more than 9 spreads, the Enhanced Limit Order will be rejected by the market and no quantity will be filled. Customer may place a new order if he/she wants to buy the shares.
Example 2 (for illustration only):
Customer has placed an Enhanced Limit Order to sell 20,000 shares of a stock at HKD8.00 each.
The Bank will submit the order to the market for matching once up to the 10 best price queues at prices equal to or higher than the customer's sell order price (i.e. HKD8.00).
The price queues in the market:
Bid Price (HKD) Quantity Filled quantity (Sell)
8.02 1,000 1,000 shares @HKD8.02
8.01 1,000 1,000 shares @HKD8.01
8.00 5,000 5,000 shares @HKD8.00
7.99 1,000 Total: 7,000shares
7.98 4,000
7.97 3,000 Unfilled quantity (Sell)
7.96 4,000 13,000 shares
7.95 5,000
7.94 2,000
7.93 2,000
7.92 1,000
Transaction Result: The Enhanced Limit Order is only partially executed by buying a total of 7,000 shares after matching with the 3 price queues at the prices equal to or higher than the customer's order price (i.e. HKD8.00). The unfilled quantity of the order (i.e. 13,000 shares) will be converted to a typical Limit Order at the limit price of HKD8.00 specified previously for further matching.
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Market Order (MO)

Market Order is an order which customers do not specify the price. A Market Order that is entered into the trading system during the Continuous Trading Session will be executed at the current bid/ask price at the time when the order is processed. Upon customers' confirmation of any Market Order placement, the Bank will submit the buy/sell order to the market by matching it once up to 10 best price queues in the prevailing market and up to a maximum of 10 spreads above/below the nominal price at the time when the order is processed, provided that the order price is not lower than 0.01 of the denominated currency of the relevant stock. Any unfilled quantity of the Market Order resulting from completion of the above procedure will be automatically cancelled at once. After placement of a Market Order, customers are advised to check the order status and execution result. Customers should also be aware that the final execution price may deviate considerably from the nominal price at order placement, especially for illiquid stocks and/or at the beginning of Morning and Afternoon Trading Sessions due to handling of the orders that have been accumulated before the market opens.
Example 1 (for illustration only):
Customer has placed a Market Order to buy 20,000 shares of a stock.
Assume that the prevailing nominal price of that stock is HKD8.00 with a price spread of HKD0.01.
The Bank will calculate the required transaction amount and trading related charges based on the 10 spreads above the nominal price of the stock (i.e. HKD8.10) and the sum will be withheld from the customer's available investment amount. The Bank will submit the order to the market for matching once up to the 10 best price queues at prices equal to or lower than the nominal price plus 10 spreads (i.e. HKD8.10).
Scenario A
The price queues in the market:
Ask Price (HKD) Quantity Filled Quantity (Buy)
8.00 3,000 3,000 shares @HKD8.00
8.01 2,000 2,000 shares @HKD8.01
8.02 1,000 1,000 shares @HKD8.02
8.03 1,000 1,000 shares @HKD8.03
8.04 3,000 3,000 shares @HKD8.04
8.05 2,000 2,000 shares @HKD8.05
8.06 3,000 3,000 shares @HKD8.06
8.07 1,000 1,000 shares @HKD8.07
8.08 1,000 1,000 shares @HKD8.08
8.09 4,000 3,000 shares @HKD8.09
8.10 1,000 Total: 20,000 shares
Transaction Result: The Market Order is fully executed by buying all 20,000 shares after matching with the 10 best price queues in the prevailing market.
Scenario B
The price queues in the market:
Ask Price (HKD) Quantity Filled Quantity (Buy)
8.00 3,000 3,000 shares @HKD8.00
8.01 0 1,000 shares @HKD8.02
8.02 1,000 1,000 shares @HKD8.03
8.03 1,000 2,000 shares @HKD8.05
8.04 0 1,000 shares @HKD8.07
8.05 2,000 1,000 shares @HKD8.08
8.06 0 Total: 9,000 shares
8.07 1,000
8.08 1,000 Unfilled Quantity (Buy)
8.09 0 11,000 shares
8.10 1,000
Transaction Result: The Market Order is only partially executed by buying a total of 9,000 shares after matching with the 10 best price queues in the prevailing market. The unfilled quantity of the order (i.e. 11,000 shares) will be automatically cancelled. Customer may place a new order if he/she wants to buy the unfilled quantity.
Example 2 (for illustration only):
Customer has placed a Market Order to sell 20,000 shares of a stock.
Assume that the prevailing nominal price of that stock is HKD6.00 with a price spread of HKD0.01.
The Bank will submit the order to the market for matching once up to the 10 best price queues at prices equal to or higher than the nominal price minus 10 spreads (i.e. HKD5.90).
Scenario A
The price queues in the market:
Bid Price (HKD) Quantity Filled quantity (Sell)
5.97 4,000 4,000 shares @HKD5.97
5.96 2,000 2,000 shares @HKD5.96
5.95 1,000 1,000 shares @HKD5.95
5.94 1,000 1,000 shares @HKD5.94
5.93 2,000 2,000 shares @HKD5.93
5.92 1,000 1,000 shares @HKD5.92
5.91 1,000 1,000 shares @HKD5.91
5.90 2,000 2,000 shares @HKD5.90
5.89 1,000 Total: 14,000 shares
5.88 2,000
5.87 3,000 Unfilled quantity (Sell)
6,000 shares
Transaction Result: The Market Order is only partially executed by selling a total of 14,000 shares after matching with the 8 price queues at the prices equal to or higher than the nominal price of the stock minus 10 spreads (i.e. HKD5.90). The unfilled quantity of the order (i.e. 6,000 shares) will be automatically cancelled. Customer may place a new order if he/she wants to sell the unfilled quantity.
Scenario B
The price queues in the market:
Bid Price (HKD) Quantity Filled quantity (Sell)
5.89 1,000 0 shares
5.88 1,000
5.87 0 Unfilled quantity (Sell)
5.86 1,000 20,000 shares
5.85 0
5.84 3,000
5.83 2,000
5.82 1,000
5.81 5,000
5.80 6,000
5.79 2,000
Transaction Result: Since the nominal price deviates from the market bid price by more than 10 spreads, the Market Order is not executed and no quantity is filled. The unfilled quantity of the order (i.e. 20,000 shares) will be cancelled. Customer may place a new order if he/she wants to sell the unfilled quantity.
Example 3 (for illustration only):
Customer has placed a Market Order to sell 100,000 shares of a stock.
Assume that the prevailing nominal price of that stock is HKD0.012 with a price spread of HKD0.001.
Under the condition that the order price must not be lower than $0.01 (while the prices will fall below $0.01 based on the 10 spreads below the nominal price in this case), the Bank will submit the order to the market for matching once up to the 10 best price queues at prices equal to or higher than HKD0.01.
The price queues in the market:
Bid Price (HKD) Quantity Filled quantity (Sell)
0.012 10,000 10,000 shares @HKD0.012
0.011 0 20,000 shares @HKD0.010
0.010 20,000 Total: 30,000 shares
     
Unfilled quantity (Sell)
70,000 shares
Transaction Result: The Market Order is only partially executed by selling a total of 30,000 shares after matching with the 3 price queues at the prices equal to or higher than HKD0.01. The unfilled quantity of the order (i.e. 70,000 shares) will be automatically cancelled. Customer may place a new order if he/she wants to sell the unfilled quantity.
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Indicative Equilibrium Price (IEP)

IEP is the price at which the maximum number of shares can be executed after matching during the Pre-opening Session. IEP can be calculated only if the highest bid price is equal to or higher than the lowest ask price of the At-auction Limit Orders.
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Indicative Equilibrium Volume (IEV)

IEV is the number of shares that can be matched at the IEP.
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