trade through

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Trade Through

To trade a security on a given exchange when a better price is available on a different exchange. Computerized links between exchanges have made trading through inadvertently less common and more difficult for unscrupulous brokers. Rule NMS attempts to prevent trading through by requiring most orders to be sent to the exchange with the best possible price.

trade through

To transact an order on an exchange when a more advantageous price is available through another source.