HN: Can HFTs front-run retail investors by asking their discount brokerage what their limit orders are? Me: Those words, they do not mean what they think you mean.
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For technologists not in exchanges/etc: a limit order's purpose is to *announce publicly your willingness to trade*. The author of that comment believes that a HFT firm can suborn your broker to reveal your non-public desire to trade to him. That is not how any of this works.
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You can get a list of unexecuted limit orders from a stock exchange. This is known colloquially as the order book and the specific data feed you're asking for is often called "L2 data." Maintaining and broadcasting the order book is *why we have stock exchanges.*
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A stock exchange exists to collect buyers and sellers and assist in their ability to transact, producing (as a side effect) widespread public knowledge of market intentions which assist in price discovery.
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End of conversation
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I'm afraid I might be one of those people because the question does make sense to me. I believe the answer is yes, and that DeGiro's hedge fund was "caught" doing that to the "client" investors: http://www.amsterdamtrader.com/2015/09/degiro-clients-as-counterparty-for-hedgefund.html … Is that not what the question is about?
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