™30-second takeaway
What Happens When You Buy a Stock?, in one thought.
Follow a stock order from your screen through routing, matching, execution and settlement.
See how each idea connects before exploring the details below.
Put the idea into numbers.
Buying 100 shares at $50 creates a $5,000 position. If the bid-ask spread is $49.95–$50.05, an immediate round trip can begin with a cost even before commissions or market movement.
Where understanding breaks down.
Assuming the displayed quote guarantees the execution price, especially in fast or thin markets.
Remember this.
Order type, liquidity, spread and routing shape the transaction you actually receive.
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.
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.
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.
Market rules and product features can change. These authoritative starting points help readers confirm current information.
Connect the concept
Go from explanation to application.
Continue with a related definition and an educational calculator that makes the numbers easier to see.