1. Trading Hours

2. Order Matching Methods

Periodic Auction Matching:
A trading method in which buy and sell orders are matched at a specified time based on the aggregated orders in the system.

Continuous Matching:
A trading method whereby buy and sell orders are matched immediately upon entry into the trading system.

Negotiated (Put-through) Transactions:
A trading method in which trading members mutually agree on the terms and conditions of the transaction.

3. Order Matching Principles

Price Priority

• Buy orders with higher prices are executed before those with lower prices.

• Sell orders with lower prices are executed before those with higher prices.

Time Priority

• Where buy or sell orders have the same price, the order entered earlier into the trading system shall receive execution priority.

4. Trading Unit

• Standard lot: 100 shares / fund certificates.

• Put-through transactions: Minimum of 5,000 shares.

Odd-lot transactions with volumes from 01 to 99 shares or fund certificates may be executed through continuous matching or negotiated transactions.

Put-through transactions and odd-lot transactions are not permitted on the first trading day of newly listed shares.

5. Price Quotation Unit (Tick Size)

• Order-matching transactions (shares): VND 100.

• Put-through transactions (shares): VND 1.

6. Price Fluctuation Limits

• Shares: ± 10% compared to the reference price.

• Shares and fund certificates on the first trading day, or the first trading day after a suspension of more than 25 days: ± 30% compared to the reference price.

7. Reference Price

The reference price is determined as the closing price of the immediately preceding trading day.

8. Order Types

Limit Order (LO):
Valid from the time it is entered into the trading system until the end of the closing periodic auction session or until the order is cancelled.

Market Orders may only be entered during the continuous matching session.

• Market-to-Limit Order (MTL):
  Functions similarly to the MP order on the Ho Chi Minh Stock Exchange.

• Market Order – Fill or Kill (MOK):
  A market order that is automatically cancelled if it cannot be fully executed upon entry into the trading system.

• Market Order – Immediate or Cancel (MAK):
  A market order that may be partially or fully executed; any unfilled portion will be immediately cancelled after matching.

ATC Order (At-the-Close Order):
Valid during the closing periodic auction session.

PLO Order (Post-Limit Order)

• A buy or sell order placed at the closing price after the closing periodic auction session.

• PLO orders may only be entered during the after-hours trading session.

• PLO orders are matched immediately upon entry if a corresponding counter order is available. The execution price is the closing price of the trading day.

• PLO orders cannot be amended or cancelled.

• If the continuous matching session or closing periodic auction session fails to determine an execution price, PLO orders cannot be entered into the system.

• At the end of the after-hours trading session, any unexecuted PLO orders or remaining portions of such orders will be automatically cancelled.

9. Order Amendment / Cancellation

Order amendments (price or quantity) and cancellations are only applicable to orders that have not yet been executed or to the unfilled portion of partially executed orders.

During the Continuous Matching Session:

Limit orders may be amended (price or quantity) or cancelled during the trading session. Order priority after amendment is determined as follows:

• Priority remains unchanged if only the order quantity is reduced.

• Priority is recalculated from the time the amended order is entered into the trading system in cases where the order quantity is increased and/or the price is amended.

During the Closing Periodic Auction Session (ATC):

• LO and ATC orders cannot be amended or cancelled, including LO orders carried forward from the continuous matching session.

During the After-Hours Trading Session:

• PLO orders cannot be amended or cancelled.