A broker-dealer is a person or company that buys and sells securities. It acts as a broker when it handles a trade for a customer. It acts as a dealer when it trades for its own account as part of its business.
The same firm can take both roles. It may act as your broker when it sends your stock order to an exchange, then act as a dealer in another transaction by selling bonds from its own inventory.
This distinction matters because the firm’s role affects how your trade is handled, how the firm gets paid, and which conflicts of interest you should understand.
One firm, two roles
The role changes with the trade
For the customer
Broker
The firm arranges or executes the trade as an agent.
- Counterparty
- Another buyer or seller
- Common pay
- Commission or transaction fee
- Check
- Where was the order sent?
For the firm itself
Dealer
The firm trades from its own account as the principal.
- Counterparty
- The broker-dealer
- Common pay
- Markup, markdown, or spread
- Check
- What price did the firm trade at?
The company does not have to change. Its capacity can change from one transaction to another.
The SEC’s definition is based on whose account the firm is trading for:
- A broker carries out securities transactions for others.
- A dealer buys and sells securities for its own account as a regular business.
An investor trading a personal portfolio is not automatically a dealer. The dealer activity must be part of a business, not simply investing or trading for yourself.
A simple broker-dealer example
Suppose you place an order to buy 100 shares of a company.
If your brokerage firm sends the order to an exchange and finds another seller, it acts as your broker. It represents your side of the transaction and may receive a commission or another form of compensation.
If the firm sells you 100 shares from its own inventory, it acts as a dealer. The firm is now your counterparty. Its compensation may be built into the price as a markup rather than shown as a separate commission.
Your trade confirmation should state whether the firm acted as an agent or principal. It should also contain details such as the security, quantity, price, trade date, and certain fees or compensation. The SEC explains these disclosures in its investor bulletin on trade confirmations.
What does a broker-dealer do?
Most people meet a broker-dealer through a brokerage account or trading app. The name of the app may be more familiar than the legal entity behind it, but that entity performs the regulated brokerage work.
Depending on its business, a broker-dealer may:
- open and maintain brokerage accounts;
- accept orders to buy or sell securities;
- route orders to exchanges, market makers, or other trading venues;
- execute trades for customers;
- buy and sell securities as principal;
- provide research or investment recommendations;
- underwrite new stocks or bonds;
- lend customers money through margin accounts;
- issue trade confirmations and account statements.
Not every broker-dealer offers every service. An online discount firm may focus on self-directed accounts. A full-service firm may pair trading with recommendations from a registered professional. An institutional firm may work mainly with funds, companies, or other financial institutions.
How a securities trade works
The order may take only a second on your screen. More happens behind it.
From order to ownership
What happens after you tap Buy
The app makes the process look instant. Execution is fast, but the trade still has to be confirmed and settled.
- 01 Order You choose the security, amount, and order type.
- 02 Routing The firm sends the order to a trading venue.
- 03 Execution A buyer and seller agree on the trade.
- 04 Confirmation The price, quantity, role, and fees are recorded.
- 05 Settlement Cash and securities are delivered, usually on T+1.
Execution sets the terms of the trade.
Settlement completes the exchange of money and securities.
1. You place an order
You choose the security, quantity, and order type. A market order prioritizes execution but does not guarantee an exact price. A limit order sets the highest price you will pay or the lowest price you will accept.
2. The broker-dealer decides where to send it
The firm may route the order to an exchange, a market maker, an electronic trading venue, or another broker-dealer. It may also fill the order internally when permitted.
A broker-dealer has a duty to seek the most favorable terms reasonably available under the circumstances. This is known as best execution. It does not mean every order will receive the best price visible anywhere at every moment, but the firm cannot base routing decisions only on what pays the firm most.
3. The order is executed
Execution happens when a buyer and seller agree on the trade. The price can differ from the quote you saw when you submitted the order, especially in a fast market or for a security with low trading volume.
4. You receive a confirmation
The confirmation records the completed transaction. Check the price, quantity, fees, and the capacity in which the firm acted. If the firm acted as principal, it traded with you rather than only arranging the trade.
5. The trade settles
Execution and settlement are not the same event. Execution locks in the trade. Settlement is when the buyer receives the securities and the seller receives the money.
Most U.S. securities transactions now settle on the next business day, known as T+1. If a stock trade executes on Monday and neither day is a market holiday, it normally settles on Tuesday. FINRA explains the current T+1 cycle here.
The firm you see on your account may not complete every step itself. Some broker-dealers introduce or execute the trade while a separate clearing firm handles settlement and custody. That does not change the basic customer experience, but the clearing firm’s name may appear on your statements and account documents.
Is a dealer the same as a market maker?
No. A market maker is a type of dealer, but not every dealer is a market maker.
A dealer trades securities for its own account as a business. A market maker stands ready to buy or sell a particular security at publicly quoted prices. Its bid is the price it offers to pay. Its ask is the price at which it offers to sell.
The difference between those prices is the spread. A market maker can earn money from that spread, but it also takes risk. The value of the security may move while the firm holds it.
Market makers can make it easier to trade when a natural buyer and seller do not arrive at the same time. But the term should not be used as a synonym for every broker-dealer. The SEC gives a concise definition of a market maker.
How broker-dealers make money
The answer depends on the firm, the account, and the products being traded. “Zero commission” does not mean the firm has no revenue or that investing has no costs.
Commissions
The firm may charge a stated amount for executing a trade as an agent. This is still common in options, bonds, assisted trades, and some full-service accounts, even when online stock trades cost $0.
Markups and markdowns
When a broker-dealer trades with you as principal, it may sell above the prevailing market price or buy below it. The difference is called a markup or markdown.
Spreads and principal trading
A dealer may earn the difference between its buying and selling prices. Principal trading can also produce a loss. The firm is using its own capital and taking market risk.
Margin interest
A margin account allows you to borrow money from the brokerage firm to buy securities. The firm charges interest on that loan. Margin can increase both gains and losses, and the firm may sell assets in the account if equity falls below required levels.
Account and service fees
These may include account maintenance, transfers, paper statements, wire transfers, subscriptions, or broker-assisted services. The details should appear in the firm’s fee schedule.
Payment for order flow
Some firms receive compensation for routing orders to particular trading venues or market makers. This is called payment for order flow. A firm still has a best-execution obligation, and routing compensation can create a conflict that investors should understand.
FINRA’s guide to fees and commissions explains why commission-free trading can still involve other costs.
Broker-dealer vs investment adviser
A broker-dealer and an investment adviser can both work with investors, but the services and fee structures are different.
A broker-dealer usually handles transactions in a brokerage account. You decide what to buy or sell, although a registered professional may make recommendations. Brokerage charges often relate to transactions, products, or account services.
An investment adviser provides ongoing advice or portfolio management. Advisory fees are often based on the value of the assets being managed, although other arrangements exist.
Many financial companies are registered as both. That is called dual registration. A professional at a dual-registered firm may work with you in a brokerage capacity for one service and an advisory capacity for another.
Ask which capacity applies to your account. Do not assume it from a job title or company name. FINRA’s brokerage and advisory account comparison explains the practical differences.
How broker-dealers are regulated
Broker-dealer is a U.S. securities-law term. Most firms that meet the definition must register with the SEC and join a self-regulatory organization, usually FINRA. State requirements may also apply.
Registration does not mean the government approves every product a firm sells or guarantees that the firm cannot fail. It means the firm operates within a regulatory system that includes conduct rules, recordkeeping, financial requirements, examinations, and public disclosures.
When a broker-dealer recommends a securities transaction, investment strategy, or account type to a retail customer, Regulation Best Interest may apply. It requires the firm and its professionals to address disclosure, care, conflicts of interest, and compliance obligations. The recommendation cannot put the firm’s financial interests ahead of the retail customer’s interests. The SEC provides a plain overview in its Regulation Best Interest guide.
Retail investors should also receive Form CRS, a short relationship summary. It describes the firm’s services, fees, conflicts, disciplinary history, and questions customers can ask. The SEC keeps its Form CRS materials and guidance in one place.
What SIPC protection does and does not cover
Most U.S. broker-dealers that hold customer securities must be members of the Securities Investor Protection Corporation, or SIPC.
If a SIPC-member brokerage firm fails and customer assets are missing, SIPC may protect eligible cash and securities up to $500,000 for each separate customer capacity, including up to $250,000 for cash held for buying securities.
SIPC does not protect:
- a fall in the market value of an investment;
- poor investment advice;
- promised returns;
- assets that are not eligible for SIPC protection;
- an account at a firm that is not a SIPC member.
SIPC protection is not the same as FDIC insurance for a bank deposit. The SIPC investor guide explains the limits and conditions.
How to check a broker-dealer before opening an account
Start with the legal name of the firm, not only the brand shown in an app or advertisement.
- Search FINRA BrokerCheck. The free database shows registration details, business activities, employment history, and reported disciplinary events for firms and registered professionals.
- Read Form CRS. Look at services, fees, conflicts, account requirements, and disciplinary disclosures.
- Check the fee schedule. Review commissions, option fees, margin rates, transfers, subscriptions, and account charges.
- Find the clearing firm. Its name may appear in the customer agreement or at the top of an account statement.
- Confirm SIPC membership. Do not treat a logo on a website as sufficient proof.
- Review trade confirmations. Check whether the firm acted as agent or principal and whether the transaction matches your order.
FINRA BrokerCheck is the best starting point for checking a U.S. brokerage firm or registered professional.
Be cautious if someone pressures you to act quickly, guarantees returns, asks you to send money to a personal account, or avoids giving you the firm’s legal name and registration details.
What matters most
The term broker-dealer describes two roles in one name.
As a broker, the firm handles a securities trade for a customer. As a dealer, it trades for its own account. That difference affects the firm’s compensation, its conflicts, and the information shown on your confirmation.
You do not need to understand every step of market infrastructure before opening a brokerage account. But you should know who the legal firm is, how it gets paid, whether it is acting as agent or principal, and where to check its record.
