Anatomy of a Stock Trade

Stock trades are free these days at most online brokers. But where and how your trade is filled can impact your purchase price. And “it all happens in a flash,” says Jeff Chiappetta, vice president of trade and education at Schwab. It takes just 0.08 seconds, on average, at Schwab, from the time you submit your trade to validation of execution. Here’s a step-by-step look at what happens when you place a market-order stock trade.

- By Nellie S. Huang

STEP ONE: YOU CLICK “BUY”

After you submit a trade but before it is routed to the next step, your brokerage firm will review your trade for certain factors. The size of the company and the size of your trade can influence where and how the order is filled and the price you pay. Fractional orders or oversized orders (say, more than 10,000 shares), for instance, may be filled in multiple transactions. Some firms may scrutinize a trade for whether it could impact the stock’s trading price. An exceptionally large order “could drive the price of a stock up or down,” says Chiappetta, “and we don’t want that.” Some firms also check to see that you have the cash or margin in your account to cover the trade; others may give you leeway to fund the account over the next two business days.

STEP TWO: ROUTING