What Is a Broker?

What Is a Broker?

A broker is the middleman between you and the stock exchange. You cannot walk onto an exchange and trade; instead you place an order with a licensed broker, who executes it for you. Today this is usually an app or website where you can buy a stock in seconds, but the role is the same one brokers have always played: a regulated intermediary that connects ordinary investors to a market they could not otherwise reach.

Broker Versus Dealer

A small but important distinction: a broker buys and sells securities on behalf of clients, acting as an agent, while a "dealer" buys and sells for its own account, taking the other side of trades. Many firms do both and are called "broker-dealers". The difference matters because it shapes whose interest is being served: as a broker, the firm is meant to act for you, finding the best execution for your order; as a dealer, it is trading its own book. Knowing which hat a firm is wearing in a given transaction is part of understanding how the market really works.

What Types of Broker Are There?

• Discount or online brokers: low-cost, self-directed platforms, often commission-free, the modern default for most people.
• Full-service brokers: offer personal advice, planning and portfolio management, typically for a fee of around 1% to 2% of assets a year.
• Robo-advisers: automated platforms that build and manage a portfolio for you by algorithm, usually for a low fee of roughly 0.25% to 0.5%.

How Do Brokers Make Money?

If trading is "free", how does the broker get paid? The honest answer is several ways. Traditionally it was commissions, a fee per trade, and full-service and robo firms still charge a percentage of the assets they manage. But the rise of zero-commission trading was funded by other channels: interest earned on the cash and on margin loans in your account, fees on premium features, and, controversially, payment for order flow, where the broker is paid to route your trades to a market maker. The lesson is the familiar one: when a service looks free, it is worth understanding how it is actually being paid for.

Is My Money Safe? Custody and SIPC

Your broker is also your "custodian": it holds your investments on your behalf, but it does not own them, and rules forbid it from using your assets to fund its own business. If a broker fails, a separate safety net steps in. In the US, the SIPC, created by law in 1970, protects the custody function: it works to return customers’ securities and cash, up to 500,000 dollars in total, of which up to 250,000 can be cash, when a member brokerage collapses.

How Brokers Changed the Market

Brokers have reshaped who invests. When trading was expensive and gated behind phone calls and high commissions, markets were dominated by professionals. Cheap, app-based brokers tore down that barrier, bringing millions of retail investors into the market with fractional shares and one-tap orders. That democratisation is largely a good thing, more people can build wealth, but it has a side effect: retail money tends to move on emotion and narrative, so equity markets have become a little faster, more crowded and more sentiment-driven than they were in the gated era.

Brokers and Market Sentiment

By opening the doors so wide, brokers have amplified the role of sentiment in markets. A larger, more emotional retail crowd means sharper swings between fear and greed, the very thing a Stock Fear and Greed Index measures on a 0 to 100 scale. CFGI scores that mood daily across major indices and leading stocks, which makes a sentiment gauge more useful now than ever: in a market shaped by millions of new, easily reachable investors, knowing when the crowd is at an emotional extreme is a genuine edge.