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When I ask a broker to buy stock, what does the broker do?
Here are a couple of articles that can help highlight the differences between a broker and an online investment service, which seems to be part of the question that you're asking. Pay attention to the references at the end of this link. http://finance.zacks.com/online-investing-vs-personal-broker-6720.html Investopedia also highlights some of the costs and benefits of each side, broke and online investment services. http://www.investopedia.com/university/broker/ To directly answer your question, a broker may do anything from using a website to making a phone call to submitting some other form of documentation. It is unlikely that he is talking directly to someone on the trading floor, as the volume traded there is enormous.