Who this is for — Readers who need to interpret messages such as “received”, “working”, “partially filled” or “cancel pending” without confusing them with completion or settlement of the transaction.
The lifecycle of an order is the sequence of events connecting a client's instruction to any resulting executions. There is no universal machine: brokers, venues, instruments, sessions and jurisdictions may use different states and controls. One distinction is nevertheless stable: submitting an order does not mean that it has executed, and execution does not mean that clearing and settlement are already complete.
In plain language — The typical path is: instruction → controls → receipt → routing → venue acceptance → matching → one or more fills → management of the remainder → post-trade. Every arrow can produce a reject, a delay or an intermediate state.
1. Configuration and submission
An order begins with a set of fields: instrument, buy or sell side, quantity, order type, any stop and limit prices, duration and other permitted instructions. Before submission, the economic intention must be separated from the technical instruction. “I want to exit if the market falls” does not yet specify which price triggers the stop, which order is created after the trigger or how long it remains valid.
The platform may run local checks, but a message displayed on the device does not prove that the broker or venue received the order. Click time, broker receipt time and venue entry time are different timestamps.
2. Broker controls and acceptance
The broker may check whether fields are complete, the account is authorised, funds or inventory are available, margin and risk limits are satisfied, the session is open and the order type is compatible with the product. An order may therefore be rejected before it reaches a venue. “Accepted by broker” only means that the instruction has entered the broker's order-management system; it is not a fill.
In the United States, the SEC explains that an online customer's order normally goes through a broker, which decides how to route it. For US stocks, the destination may, depending on the circumstances, be an exchange, a market maker, an electronic network or an internalisation process. This list should not be transferred automatically to other instruments or countries.
3. Routing and venue receipt
The broker or its router selects a destination according to client instructions, execution policy, market conditions and applicable rules. A venue may then accept, reject, reprice or suspend the order only as allowed by its rules. Price and risk controls can prevent instructions deemed invalid or outside permitted parameters from entering the market.
Once accepted, the order may become working, meaning active. A limit order that is not immediately executable may be placed in the book; a conditional order may remain inactive until its trigger. The precise meaning of “working” depends on the system and must be read together with the remaining quantity and venue.
4. Matching, fills and remainder
The matching engine compares the order with compatible interest under the venue's priority rules and algorithm. Possible outcomes include:
| Operational state | Prudent meaning |
|---|---|
| Fully filled | all eligible quantity has received a fill |
| Partially filled | only part has traded; a remainder exists |
| Working | the remainder remains active under its duration and rules |
| Cancelled | the unexecuted portion is no longer active |
| Expired | validity ended before the remainder was completed |
| Rejected | the order was not admitted by the system that assessed it |
One order may generate several executions at different times and prices. “Order price” and “average fill price” are therefore not synonyms. The page Order priority and partial fills examines queue management and remaining quantity.
A modification or cancellation request introduces another stage. Until the system confirms it, the order may still be executable; moreover, cancelling the remainder does not reverse the quantity that has already traded. Some amendments retain priority while others lose it under venue-specific rules: there is no answer that applies to every market.
5. Confirmation and the post-trade boundary
A fill creates a transaction for the executed quantity. Confirmation, possible clearing and settlement follow. Clearing may determine positions and obligations; settlement transfers securities, cash or other assets under the applicable infrastructure. These stages must not be backdated to the click or confused with the “filled” state.
Custody is also a separate role: it concerns the recording and safeguarding of assets, not venue selection or order matching.
General rules and regulatory perimeters
In the European Union, Article 28 MiFID II requires procedures for prompt, fair and expeditious execution of client orders and handles otherwise comparable orders according to time of receipt. This is an order-handling rule for the firm, not evidence that every venue uses the same matching algorithm. Article 27 separately governs best execution by reference to price, costs, speed, likelihood of execution and settlement, size and nature.
Within the US NMS-stock perimeter, Rule 605 uses defined timestamps and benchmarks to make certain execution-quality statistics comparable. Its categories are not a universal taxonomy for futures, currencies, digital assets or markets in other countries.
Common mistakes — Reading “submitted” as “working”, “working” as “filled”, or “filled” as “settled”; ignoring the remainder after a partial fill; treating a cancellation as complete before confirmation.
Minimum record for reconstructing an order
Retain the identifier, instrument, side, initial and remaining quantities, type, conditional prices, duration, available timestamps, destination, individual fills, commissions, rejects and amendment messages. This history helps separate a flawed decision from a transmission, routing, liquidity or post-trade problem.
Sources
- U.S. Securities and Exchange Commission, Investor.gov, Executing an Order — transmission to a broker, possible destinations and the difference between the observed quote and execution.
- U.S. Securities and Exchange Commission, Frequently Asked Questions: Rule 605 of Regulation NMS — receipt, timestamps, partial executions, cancellations and execution-quality statistics within the rule's perimeter.
- European Securities and Markets Authority, MiFID II, Article 27 — Obligation to execute orders on terms most favourable to the client — best-execution factors and execution policy.
- European Securities and Markets Authority, MiFID II, Article 28 — Client order handling rules — prompt, fair and expeditious handling of client orders.