How Are Trading Orders Executed?

Execution is the process through which a trading order becomes an actual transaction or position.

Although execution may happen extremely quickly, several steps can occur between clicking Buy or Sell and receiving confirmation.

Step 1: The order is submitted

The trader selects:

• Instrument

• Position size

• Order type

• Buy or sell

• Any additional conditions

The instruction is then sent to the trading system.

Step 2: The system checks the order

Depending on the trading product and account, the system may verify:

• Account status

• Trading permissions

• Available margin

• Position limits

• Instrument availability

• Order validity

Step 3: Available pricing is checked

The system identifies pricing and available liquidity that can satisfy the order.

Market conditions may change continuously during this process.

Step 4: The order is executed

If the order conditions can be met, the system processes the transaction.

The order may be:

• Fully filled

• Partially filled

• Rejected

• Cancelled

• Left pending

depending on the order type and market conditions.

Step 5: Execution confirmation

Once completed, the trading platform generally displays information such as:

• Execution price

• Position size

• Order number

• Time of execution

• Open position information

Why can execution differ?

Factors that may influence execution include:

• Market liquidity

• Market volatility

• Order size

• Trading session

• News events

• Available price levels

Understanding execution helps traders recognise why pressing Buy or Sell does not always mean receiving the exact visible price.

Lesson summary

• Execution converts an order into a transaction.

• Trading systems can perform several checks before execution.

• Available market pricing affects the final fill.

• Orders can be fully or partially filled, rejected or remain pending.

• Execution conditions depend partly on market liquidity and volatility.