That's some "You can prevent nation state actors from reading your Gmail by encrypting your IP address" level of "The author of this episode used a pastiche of words appearing in other inaccurate popular media but does not understand what is going on at any level."
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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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There was so much cringe in that thread. I particularly liked one that said "HFT doesn’t really work on retail investors" and that "Institutional investors are the prey for most HFTs." *sigh*
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I don't doubt HN's confusion on this, but I thought "front-running" involves non-public knowledge. If you know before-hand that I will trade in quantities that move the market, you can profit on that movement, while I take an equivalent loss. No?
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