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30-second takeaway
Follow a stock order from your screen through routing, matching, execution and settlement.
Learning objective
What you should be able to explain.
Trace an order from instruction to routing, execution, clearing and settlement without confusing a quote with a guaranteed fill.
Why this matters
A click, an execution and settlement are separate events. That distinction explains partial fills, price differences and when cash and securities are exchanged.
Vocabulary first
Market order: An order seeking prompt execution at the best available prices; the execution price is not guaranteed. Limit order: An order to buy or sell only at a specified price or better; execution is not guaranteed. Settlement: The process that finalizes the exchange of securities and cash after a trade.
- 1. You submit an order
- 2. Your broker routes it
- 3. The order meets liquidity
- 4. Execution and settlement
Your order specifies the security, quantity, side and order type.
The broker performs required checks and routes the order to an exchange, market maker or other venue under its execution policies.
At the venue, the order can match against a compatible order.
Follow the mechanism from left to right; each step adds context for the next.
1. You submit an order
Your order specifies the security, quantity, side and order type. A market order prioritizes execution; a limit order sets the worst price you are willing to accept.
2. Your broker routes it
The broker performs required checks and routes the order to an exchange, market maker or other venue under its execution policies.
3. The order meets liquidity
At the venue, the order can match against a compatible order. A fill may happen at once, in pieces or not at all, depending on price, size and available liquidity.
4. Execution and settlement
The broker reports the execution to you. Clearing and settlement processes then finalize the exchange of securities and cash. Most covered U.S. securities trades use T+1, the next eligible business day, rather than the next calendar day.
Price control versus execution
Order type changes the trade-off. A market order emphasizes prompt execution but does not guarantee price. A limit order sets a worst acceptable price but may remain unfilled. Liquidity, volatility, spread and order size all matter when deciding which risk is more important.
What to check after the fill
Review the execution price, quantity and whether the order filled in one piece or several. Then distinguish execution from settlement: the trade may appear in the account immediately even though securities and cash still move through clearing and settlement processes afterward.
Apply the concept.
You enter a market order for 100 shares while the best ask is $25.00 for only 40 shares. The first 40 may fill near $25.00 and the remainder at higher available offers. The displayed quote described available interest; it did not promise one price for the full order.
Where reasoning breaks down.
Pressing Buy does not send an order directly to a company. Your broker routes it to a venue and execution can occur in pieces at different prices.
Can you explain the idea?
Try recalling it in your own words, then compare your reasoning with the lesson explanation.
Try the recall practice →Put the concept into practice
Read a broker confirmation and settlement policy. Identify order time, fill price, quantity, fees and settlement date; compare trading days with calendar days.
Go one level deeper
Execution and settlement answer different questions
A fill establishes an executed quantity and price. Settlement completes the contractual transfer. Most covered U.S. securities trades use T+1: one business day after the trade, excluding applicable holidays. That does not make a quote an execution or eliminate settlement failures. Cash-account payment rules and a broker's available-to-trade display still need to be understood.
A covered U.S. stock trade executes on Friday and Monday is a settlement holiday. What is the ordinary scheduled settlement day?
Tuesday, the next eligible business day. This assumes ordinary T+1 treatment and no other exception.
MAKE THE IDEA YOURS
Explain it. Try it. Come back to it.
Follow a stock order from your screen through routing, matching, execution and settlement.
TRY TO RECALL BEFORE YOU REVEAL
What does a market order prioritize?
Try a foundation question
Apply it to a second question
A covered U.S. stock trade executes on Friday and Monday is a settlement holiday. What is the ordinary scheduled settlement day?
Compare your reasoning
Tuesday, the next eligible business day. This assumes ordinary T+1 treatment and no other exception.
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What remains unclear? Give feedback about this lesson
Use this as a foundation, then verify current rules and product details with primary sources and regulated providers before acting.
Primary sources and further reading
Verify the current details.
Editorial review: 2026-10-13. The examples are hypothetical unless a named historical case is stated. Rules and product details can change; use the relevant source and actual instrument terms.
Connect the concept
Go from explanation to application.
Continue with a genuinely related definition and educational calculator.
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