A stock exchange is a regulated market venue where buyers and sellers can trade securities under the venue’s rules. Its core functions include displaying trading interest and matching compatible orders, but the exchange is only one part of the process: brokers route customer orders, and separate clearing and settlement organizations help complete trades. In the United States, national securities exchanges also operate under SEC oversight.
What an exchange does—and what it does not do
An exchange provides a venue and rules for trading. It is not the whole stock market: brokers, market makers, electronic communication networks (ECNs), and other market participants also handle orders and trading activity.
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A company’s listing exchange is not necessarily where a particular share transaction takes place. The SEC explains that a broker may route a listed-stock order to the listing exchange, another exchange, or a market maker. The place a stock is listed and the venue that executes a customer’s order are therefore separate concepts. SEC Investor.gov: Executing an Order; SEC Investor.gov: Types of Orders
How electronic orders are recorded and matched
Orders and the order book
An order is an instruction to buy or sell. A limit order sets a price constraint: a buyer specifies the most they are willing to pay, or a seller specifies the least they are willing to accept. An electronic order book records buy and sell interest, including orders waiting for a compatible trade.
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The matching function
A matching function applies a venue’s rules to incoming orders and orders already resting in its book. For example, an exchange-system manual filed with the SEC describes continuous matching between incoming and resting orders. That filing illustrates one venue’s documented design; it is not a universal specification. Exchanges can differ in order types, priority rules, trading sessions, and whether particular trading takes place continuously or through auctions. SEC-filed exchange-system manual
When compatible orders meet under the venue’s rules, a trade is executed. An exchange does not necessarily use a trading floor: electronic systems can perform these functions without one.
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What happens after a customer places an order?
- The customer submits an order to a broker. The order may specify a security, quantity, and order type, such as a limit order.
- The broker chooses where to route it. Possible destinations for a listed stock order include the listing exchange, another exchange, or a market maker. The order does not automatically go to the company’s listing venue.
- A market center handles the order. The receiving venue or participant may match it with available trading interest. An order may execute, execute in part, or remain unfilled, depending on its terms and market conditions.
- The trade is cleared and settled. Separate market infrastructure processes the transaction after execution so securities and funds can be transferred.
The displayed price is not a promise that an order will execute at that price. Prices can change while an order is being routed, and quoted prices apply to particular share quantities. The SEC states: “Your broker has a duty to seek the best execution that is reasonably available for its customers’ orders.” That duty concerns seeking a reasonably available outcome; it does not guarantee a specific price or execution. SEC Investor.gov: Executing an Order
Clearing and settlement: completing the trade
Execution, clearing, and settlement are distinct stages. The exchange or other market center handles the matching and execution; clearing and settlement infrastructure helps ensure the resulting obligations are processed and completed.
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- Clearing corporations compare member transactions, clear trades, and prepare settlement instructions.
- Depositories hold securities certificates or positions for participants, transfer positions, and maintain ownership records.
These functions support the transfer of securities and funds after a trade. They are not the same as the exchange’s order-matching function. SEC Investor.gov: Clearing and Settlement
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How U.S. exchange oversight fits in
In the United States, national securities exchanges are self-regulatory organizations (SROs): they establish and enforce rules for their members, subject to SEC oversight. The federal securities-law framework also covers other parts of the market, including brokers, transfer agents, and clearing agencies. This describes the U.S. securities-market framework; regulatory arrangements can differ in other countries and for other asset classes. SEC Investor.gov: The Role of the SEC
Quick Recap
The main components at a glance
| Component | What it does |
|---|---|
| Exchange venue and rules | Provides a market venue and rules for trading securities. |
| Orders and order book | Represent buy and sell instructions and record trading interest. |
| Matching function | Applies the venue’s rules to incoming and resting orders. |
| Broker | Receives a customer’s order and selects a market center for routing. |
| Clearing corporation | Compares and clears member transactions and prepares settlement instructions. |
| Depository | Holds securities positions, transfers them, and maintains ownership records. |
| U.S. oversight | The SEC oversees national securities exchanges, which act as SROs. |
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