Buying a share online looks like a single action. A few taps can turn an instruction on a phone or browser into an executed market transaction. Behind that interface is a chain of systems that validates the order, determines how it should be executed, records the result and updates the investor’s account.
The more interesting story is what happens between clicking “Buy” and completing the trade.
From Click To Order Instruction
The process typically starts when an investor issues an order. They will specify the security to be traded, the quantity, the type of order being placed and if relevant, any price limit. Automated checks may ensure that the account is correctly funded, the security is permissible and the order complies with the relevant trading rules.
When a trader places a market order, they’re instructing the broker to get hold of the securities at the best available price. With a limit order, the trader is setting a cut-off purchase price. The instruction is now in an order-management system, rather than simply submitted through an app or website and sent straight to an exchange.
Market Data And Order Routing
The app, however, needs market information to generate the message. Data feeds supply bid and offer prices, the aggregate amount available, and trading status. Its routing system can then send the instruction to an execution venue or other mechanism or other facility matching the instrument.
This is where technology connects with regulation. UK investment firms are required to have procedures in place to source the best possible result for their clients, considering the broker, the financial product and place of execution, the time allowed for execution and other elements. The Financial Conduct Authority lays out what’s required in its rules on dealing and best execution.
Execution And Confirmation
At the execution venue, a buy order may be matched with a corresponding sell order. Some instructions can be filled immediately; others may be partially filled or remain pending until suitable prices or quantities are available.
Trade information then travels back through the system. The platform records the execution price, quantity and time and the investor normally receives a confirmation. The position may appear in the portfolio at this stage, although processing can continue afterwards.
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Settlement And Ownership Records
Execution and settlement are separate stages. Execution establishes that a trade has been agreed; settlement is the process through which the securities and corresponding cash are transferred under the market’s settlement arrangements.
For UK electronic share transactions, CREST provides the computerised infrastructure used for securities settlement. HMRC explains that Stamp Duty Reserve Tax on qualifying electronic share purchases is collected automatically through CREST.
Brokers, custodians and settlement systems also have to reconcile cash, trade records and assets and their positions. Reconciliation means comparing all these records to make sure that what is on display to the end client is in fact backed up by the various underlying systems.
How The System Handles Costs
The dealing charge is only one element of the overall transaction that the system must calculate. Depending on the investment and account type, the technology must also dynamically process and deduct other costs, including bid-ask spreads, currency conversion charges, taxes and account-related fees.
Fee schedules published by investment platforms like XTB illustrate how these structural costs are factored into the back-end system, even when traditional dealing commissions are removed. Regardless of the pricing model, the underlying technical process remains the same: an order must still be validated, routed, executed, recorded, and settled.
Why Reliability Matters
Modern share trading is a collaboration between multiple systems, with little tolerance for error. Pricing data has to be delivered swiftly, the order information must be accurately captured, security checks have to be in place to keep accounts safe and the consolidation of the settlement data must remain consistent.
In the eyes of an investor, buying a share seems almost instantaneous. Technically, the process is a coordinated sequence of application software, market infrastructure, and post-trade controls. Knowing this sequence can help you understand what happens behind the scenes to manage your trades and what can affect execution.
