What Is a Broker? Types, Roles, and Examples

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A broker is a person or firm that arranges transactions between a buyer and a seller in exchange for a fee, commission or other compensation. In financial markets, a broker takes a client’s order to buy or sell a security, currency or other instrument and gets it executed on an exchange, through another market participant or against the firm’s own inventory. In real estate, a broker is a licensed professional who brings property buyers and sellers together and manages the deal through closing.

The word covers both an individual and a company. A stockbroker is a person, often licensed and employed by a firm. The firm that employs that person, holds client accounts and runs the trading platform is the brokerage (or broker-dealer). In everyday use, especially in online trading, “my broker” usually means the brokerage firm, not a named individual.

How a Broker Works

At its simplest, a broker sits between the client and the market. The client decides what to trade (or, with a full-service broker, agrees on a recommendation). The broker accepts the order, checks that the account can support it and routes it for execution. After the trade, the broker records the position, reports the fill and handles or arranges settlement.

Exchanges only accept orders from registered members, so an individual investor cannot send an order straight to a stock exchange. The broker holds or rents that access. It also performs the identity checks, record-keeping and reporting that regulators require.

Agency vs. principal execution

How a broker fills your order depends on whether it acts as agent or principal:

• Agency (acting as broker): The firm finds the other side of your trade in the market, on an exchange or from another firm, and earns a commission or fee for doing so. It does not own the asset it delivers to you. Firms that carry no inventory and work this way are often called agency brokers.
• Principal (acting as dealer): The firm sells to you from its own inventory or buys from you into it. Its compensation is built into the price as a markup or markdown rather than charged as a separate commission.

Many large firms do both, which is why U.S. regulation uses the combined term broker-dealer. Larger brokerages may keep an inventory of popular shares so they can fill client orders quickly and reduce exchange fees.

Brokers in forex and CFD trading

Retail forex works differently from stock trading because there is no single central exchange for spot currencies. A retail forex broker gives you a trading platform, quotes bid and ask prices and executes orders either by passing them to liquidity providers or by taking the other side itself. The two broad models are usually described as:

• Dealing desk (market maker): The broker is the counterparty to your trade and earns mainly from the spread.
• No dealing desk (STP or ECN): The broker passes orders to external liquidity and typically earns from a markup on the spread, a separate commission or both.

Forex and CFD brokers also extend leverage, so they set margin requirements and will close positions automatically if your equity falls below their threshold. In the U.S., firms that act as counterparty to retail forex trades must register with the CFTC and be members of the National Futures Association. Other countries license forex brokers through their own regulators, and the protections vary by jurisdiction.

How Brokers Make Money

The main sources of broker compensation are:

• Commissions: a charge per trade, per share or per lot.
• Spreads and markups: the difference between the price the broker pays and the price you get, common in forex and in principal trades.
• Fee-based accounts: an annual percentage of assets under management (AUM), common with managed accounts and full-service relationships.
• Payments from venues or market makers: some firms receive payment for routing client orders.
• Account and product fees: financing (overnight or swap) charges on leveraged positions, inactivity fees, and revenue from selling in-house products.

Individual brokers employed by a firm may be paid a salary, a commission tied to trading volume and products sold, or a mix. At discount brokers, staff are more often salaried.

Worked example: per side vs. round trip

Hypothetical figures for illustration only. Suppose a forex broker charges a commission of $3.50 per standard lot per side. Opening a 1-lot position costs $3.50, and closing it costs another $3.50, so the round-trip cost is $7.00 before the spread. A trader who opens and closes 2 lots ten times in a month pays:

2 lots × $7.00 × 10 trades = $140 in commissions

If another broker quotes “$7 per lot” without saying per side or round trip, the two offers could differ by a factor of two. The quote has to state the basis before you can compare them.

Hypothetical AUM example: a fee-based account charging 1% a year on a $200,000 portfolio costs $2,000 annually, whether the account trades once or a hundred times. A commission account with the same holdings might cost far less for a buy-and-hold investor and far more for an active one.

Discount vs. Full-Service Brokers

Brokers in securities markets are often grouped by how much service they bundle with execution.

Discount brokers execute trades for a low cost or no commission on standard stock and ETF trades, relying on volume and low overhead. They generally do not give personalized investment advice. Most run an online trading platform built for self-directed investors who choose their own trades.

Full-service brokers combine execution with market research, investment advice, retirement and tax planning, and access to a wider range of products. That service comes at a higher price, through larger commissions or an AUM-based fee. The wealth management arms of large banks and investment firms, such as Morgan Stanley, Goldman Sachs and Merrill (part of Bank of America), are examples of full-service offerings, often aimed at high-net-worth clients.

Online brokerage drove the growth of discount brokers and sharply cut the cost of a basic trade, which once meant calling a full-service firm and paying significant commissions. The tradeoff is that the self-directed investor takes on the research and decision-making a full-service broker would provide.

Example: A Large Stock Order

Hypothetical example. An investor wants to buy 10,000 shares of a large U.S. company, an order worth well over $1 million. Rather than click through a retail app, she contacts her full-service broker and places the order.

If the brokerage holds those shares in inventory, it may fill the order immediately as principal. If it does not, it can act as agent and buy the shares on exchanges or from other firms. To avoid pushing the price up with one large order, the broker may split it into smaller pieces, buying a few hundred to a thousand shares at a time, then deliver the full position to her account once the trades settle. The investor pays for this handling through a commission or the account’s fee arrangement.

A self-directed investor buying 10 shares of the same stock through a discount broker would get an automated fill in seconds, with no one working the order.

Broker Regulation

Securities brokers in the U.S.

Securities brokers and broker-dealers register with the SEC and with the Financial Industry Regulatory Authority (FINRA), the self-regulatory organization for the industry. Individual representatives must pass qualifying exams and be registered before they can do business with clients.

Two conduct standards apply directly to recommendations:

• Suitability: a broker must have a reasonable basis to believe a recommended investment or strategy suits the customer.
• Know your customer (KYC): the broker must make reasonable efforts to learn the customer’s identity, financial situation, tax status, investment objectives and other relevant information before making a recommendation.

In 2019 the SEC also adopted Regulation Best Interest, which since June 2020 requires broker-dealers to act in a retail customer’s best interest when recommending a security or strategy, and to disclose material conflicts.

Brokers vs. registered investment advisers

Registered investment advisers (RIAs) are regulated under the Investment Advisers Act of 1940 and owe clients a fiduciary duty: an ongoing obligation to act in the client’s best interest, with full disclosure of fees and conflicts. A broker’s obligations attach mainly to individual recommendations and transactions. Some professionals are dually registered and wear both hats, so the duty owed can depend on which account you hold with them.

Real estate brokers

Real estate brokers in the U.S. are licensed by each state, not by the federal government. State law defines what relationships a broker can have with clients (such as representing only the seller, only the buyer, or both with disclosure) and what duties the broker owes to clients and the public.

When representing a seller, a real estate broker may estimate the property’s market value, list and advertise it, show it to prospective buyers, advise on offers and contract terms, and present every offer. When representing a buyer, the broker may find properties that match the buyer’s criteria, prepare the offer and purchase agreement, negotiate with the seller, arrange inspections and repairs, and guide the buyer through closing and possession.

Broker vs. Related Terms

Broker vs. dealer. A broker arranges trades for clients and is paid for that service. A dealer trades for its own account and profits from the price. One firm can do both.

Real estate broker vs. agent. Brokers can do everything agents do, but they hold a higher license that requires more coursework and harder exams. That license allows them to supervise agents, run a brokerage and oversee transactions. Home buyers usually work with an agent, while the broker supervises the office and its agents.

Broker vs. exchange. An exchange is the venue where orders meet. A broker is how most participants get their orders to that venue.

Limitations and Risks of Using a Broker

A broker solves the access problem, but it introduces its own costs and conflicts:

• Costs compound. Commissions, spreads, financing charges and AUM fees reduce returns, and the cheapest-looking quote is not always the cheapest once every fee is counted.
• Conflicts of interest. A broker paid on volume or product sales has a reason to encourage trading or in-house products. When a broker acts as principal or market maker, it is on the other side of your trade.
• Execution quality. The price you get can differ from the price you saw, especially in fast markets. Order types such as a stop-loss order trigger at one price but can fill at another.
• Counterparty and regulatory risk. Your money sits with the broker. Protections such as segregated client funds or investor compensation schemes depend on the regulator and jurisdiction, so a broker’s licence record is worth confirming directly with the regulator listed.

The Bottom Line

Anyone opening a trading, investment or forex account depends on a broker for market access, so the choice affects both costs and protections. Compare total fees on the same basis, including spreads, per side or round-trip commissions and financing charges, and know whether the firm acts as agent or counterparty. Confirm the broker's license directly with its listed regulator, since protections vary by jurisdiction.