Internalization occurs when a broker-dealer executes a customer order using its own inventory or against another customer's order, rather than sending the order to a centralized exchange or other public venue. The practice can influence execution outcomes and the transparency of price formation in markets.
A broker-dealer that internalizes may respond to a request to trade by matching it with another customer order or by drawing on available inventory. If the execution price is within the best publicly quoted prices, the trade may be completed without exposing the order to the wider market. This can reduce market impact and routing costs, and it can sometimes result in what is described as price improvement for the client. However, internalization also concentrates execution within a single firm, which can affect the visibility of the trade and the broader information conveyed by the price discovery process. Firms typically apply risk controls and compliance checks before internalizing.
Internalization is a common feature of retail order flow processing and market-making activity in U.S. markets. It can offer speed and potential price improvement, but it may reduce transparency and alter the information reflected by public quotes. Regulators and market participants discuss how internalization relates to best execution, fair access to liquidity, and the trade-off between execution efficiency and open price formation. Understanding the practice helps investors read how order flow is managed by brokers and how it interacts with other venues and liquidity providers.
A broker-dealer internalizes a customer order for 1,000 shares by filling it from its own inventory at a price within the current public quotes, rather than routing the order to a public venue.
Price improvement · Order routing · Payment for order flow · Best execution · Market maker · Dark pool