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Trade Execution: What Every Investor Should Know 
(Source: U.S. Securities and Exchange Commission)

Trade Execution Isn’t Instantaneous
Your Broker Has Options for Executing Your Trade
Your Broker Has a Duty of “Best Execution”
You Have Options for Directing Trades

When you place an order to buy or sell stock, you might not think about where or how your broker will execute the trade. But where and how your order is executed can impact the overall costs of the transaction, including the price you pay for the stock. Here's what you should know about trade execution:

Trade Execution Isn’t Instantaneous
Many investors who trade through online brokerage accounts assume they have a direct connection to the securities markets. But they don't. When you push that enter key, your order is sent over the Internet to your broker—who in turn decides which market to send it to for execution. A similar process occurs when you call your broker to place a trade.

While trade execution is usually seamless and quick, it does take time. And prices can change quickly, especially in fast-moving markets. Because price quotes are only for a specific number of shares, investors may not always receive the price they saw on their screen or the price their broker quoted over the phone. By the time your order reaches the market, the price of the stock could be slightly – or very – different.

No SEC regulations require a trade to be executed within a set period of time. But if firms advertise their speed of execution, they must not exaggerate or fail to tell investors about the possibility of significant delays.

Your Broker Has Options for Executing Your Trade
Just as you have a choice of brokers, your broker generally has a choice of markets to execute your trade:

• For a stock that is listed on an exchange, such as the New York Stock Exchange (NYSE), your broker may direct the order to that exchange, to another exchange (such as a regional exchange), or to a firm called a "third market maker." A "third market maker" is a firm that stands ready to buy or sell a stock listed on an exchange at publicly quoted prices. As a way to attract orders from brokers, some regional exchanges or third market makers will pay your broker for routing your order to that exchange or market maker—perhaps a penny or more per share for your order. This is called "payment for order flow."
• For a stock that trades in an over-the-counter (OTC) market, such as the Nasdaq, your broker may send the order to a "Nasdaq market maker" in the stock. Many Nasdaq market makers also pay brokers for order flow.
• Your broker may route your order – especially a "limit order" – to an electronic communications network (ECN) that automatically matches buy and sell orders at specified prices. A "limit order" is an order to buy or sell a stock at a specific price.
• Your broker may decide to send your order to another division of your broker's firm to be filled out of the firm's own inventory. This is called "internalization".  In this way, your broker's firm may make money on the "spread" – which is the difference between the purchase price and the sale price.

The graphic below shows your broker's options for executing your trade:

Your Broker Has a Duty of “Best Execution”
Many firms use automated systems to handle the orders they receive from their customers. In deciding how to execute orders, your broker has a duty to seek the best execution that is reasonably available for its customers' orders. That means your broker must evaluate the orders it receives from all customers in the aggregate and periodically assess which competing markets, market makers, or ECNs offer the most favorable terms of execution.

The opportunity for "price improvement" – which is the opportunity, but not the guarantee, for an order to be executed at a better price than what is currently quoted publicly – is an important factor a broker should consider in executing its customers' orders. Other factors include the speed and the likelihood of execution.

Here's an example of how price improvement can work: Let's say you enter a market order to sell 500 shares of a stock. The current quote is $20. Your broker may be able to send your order to a market or a market maker where your order would have the possibility of getting a price better than $20. If your order is executed at $20 1/16, you would receive $10,031.25 for the sale of your stock – $31.25 more than if your broker had only been able to get the current quote for you.

Of course, the additional time it takes some markets to execute orders may result in your getting a worse price than the current quote – especially in a fast-moving market. So, your broker is required to consider whether there is a trade-off between providing its customers' orders with the possibility – but not the guarantee – of better prices and the extra time it may take to do so.

You Have Options for Directing Trades
If for any reason you want to direct your trade to a particular exchange, market maker, or ECN, you may be able to call your broker and ask him or her to do this. But some brokers may charge for that service. Some brokers now offer active traders the ability to direct orders in Nasdaq stocks to the market maker or ECN of their choice.

In a recent speech, SEC Chairman Arthur Levitt emphasized that investors have the right to know where and how their firms execute their orders and what steps they take to assure best execution.

Ask your broker about the firm's policies on payment for order flow, internalization, or other routing practices – or look for that information in your new account agreement. You can also write to your broker to find out the nature and source of any payment for order flow it may have received for a particular order.

If you're comparing firms, ask each how often it gets price improvement on customers' orders. And then consider that information in deciding with which firm you will do business.

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Recommended further reading:
Sec Interpretation: Use of Electronic Media 
Internet Fraud:  How to avoid Internet investment scams