A stock dealer and a stock broker are both key participants in the financial market, facilitating the buying and selling of securities like stocks, bonds, and other financial instruments.
While their roles are related and sometimes overlap, there are distinct differences between a stock dealer and a stock broker:

Stock Broker:
Definition:
A stock broker acts as an intermediary between buyers and sellers of securities. They facilitate transactions on behalf of their clients (individual investors, institutions, or other financial firms) and execute trades in the financial markets.
Role and Responsibilities:
- Order Execution: Stock brokers execute buy and sell orders for clients in the market. They follow client instructions to purchase or sell specific securities at the best available market price.
- Market Access: Brokers provide access to various financial markets (e.g., stock exchanges) and trading platforms where clients can place orders and trade securities.
- Research and Advisory: Some brokers offer research reports, investment advice, and recommendations to clients based on market analysis and trends.
- Account Management: Brokers may manage client accounts, maintain records of transactions, and provide periodic statements and reports.
Types of Brokers:
- Full-Service Brokers: Provide a wide range of services including investment advice, research, and personalized portfolio management.
- Discount Brokers: Offer limited services and execute trades at lower commissions, appealing to self-directed investors.
Compensation:
Brokers earn commissions or fees for executing trades on behalf of clients. The compensation structure may vary based on the type of services provided.
Stock Dealer:
Definition:
A stock dealer, also known as a market maker or dealer, plays a different role compared to a broker. Dealers buy and sell securities directly from their own inventory, acting as principals in transactions.
Role and Responsibilities:
- Market Making: Stock dealers facilitate liquidity in the markets by providing continuous buy and sell quotes for specific securities. They quote bid (buy) and ask (sell) prices at which they are willing to trade.
- Inventory Management: Dealers maintain an inventory of securities and stand ready to buy or sell from their own stock, even if there are no matching buyers or sellers in the market.
- Risk Management: Dealers actively manage market risk associated with holding securities in inventory, adjusting prices and positions based on market conditions.
- Arbitrage and Hedging: Dealers may engage in arbitrage (exploiting price discrepancies between markets) and hedging strategies to manage risks associated with their positions.
Compensation:
Stock dealers make profits from the bid-ask spread (the difference between the buying and selling prices) and may also engage in proprietary trading to generate additional revenue.
In summary, while both stock brokers and stock dealers play crucial roles in financial markets, their primary functions differ. Stock brokers execute trades on behalf of clients and earn commissions, while stock dealers facilitate market liquidity by buying and selling securities from their own inventory, earning profits from bid-ask spreads and market activities.