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Internalization: Why Many Orders Never Reach the Wider Market

Large banks and brokers often match client orders against each other before sending anything to the open market. This practice is called internalization, and it explains why much of the activity you see is invisible.

When one client wants to buy euros and another wants to sell them, the dealer can pair them directly. The dealer earns the spread without exposure to market risk and without paying costs to trade elsewhere. Only the net imbalance, the amount by which buying exceeds selling, needs to be traded externally.

The scale is large. Major banks internalize a substantial share of their flows. This is efficient, and it lowers costs for clients, but it also means that the public price feed reflects only what remains after netting.

For retail brokers, internalization can mean that your trades are matched against other clients' trades, or against the broker's own book, particularly with a dealing desk model. The broker may hedge only part of the net position.

The implications relate to incentives. A broker that internalizes profits when clients lose collectively, since losing trades transfer money to the broker. Regulators address this through disclosure and conduct rules, and honest firms manage the conflict transparently.

It does not follow that internalization is abusive, but it is a reason to check execution policies.

Practical step: find the section of your broker's disclosure that describes how client orders are handled, and note whether it mentions hedging.

The disclosure check is worth five minutes. A broker that clearly explains when it hedges and when it keeps the risk is usually more trustworthy than one that just says no dealing desk in big letters. Look for the order execution policy document, which regulated brokers usually have to publish. It should say how orders are executed, whether the broker can act as counterparty, and how it handles slippage. If you can't find it, or it's vague, that tells you something. The broker taking the other side of your trade isn't automatically a problem. Not being honest about it is, because it means you can't judge whether your fills are fair.

Matching client orders isn't bad by itself. It can make fills cheaper. The thing to watch is whether your slippage is fair in both directions. A simple test is to note the requested price and fill price on your market orders and stops for a month. If slippage is sometimes positive and sometimes negative, roughly balanced, the execution is probably honest. If every bit of slippage goes against you and you never get a better price, that's a red flag worth raising. You need maybe thirty or forty trades for it to mean anything. Most platforms show the fill price in the trade history, so the data is already there.