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Stock market order execution
I used to work on the software in the front office (and a bit of the middle office) of a brokerage firm. This page describes the process pretty well. Basically there are three parts: So to your question: how does an order get executed? ETFs work the same since they are effectively shares of a mutual fund's assets. True mutual fund shares work differently since they don't get traded in the market. They get traded at the end of the market as just a bookkeeping exercise.