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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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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technically, those words line up just fine with 0day
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Kind of agreed: technically a limit order does not have to be passive, it can aggress. It might be intended to fill instantly and only ever take liquidity. (Using a limit order over a market order can limit slippage in case liq suddenly dissapears)
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When taking liquidity I always use limit orders, they almost always match completely.
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Some places have stop limit orders that aren’t included in the public order book.
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