# Tag Info

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The round-trip latency from point A to a matching engine at point B can be thought of being comprised of two components: $RTT_{total,A \rightarrow B} = RTT_{network\_transit,A \rightarrow B} + MPL_{matching\_engine,B}$ Where $RTT$ is the round-trip time and $MPL$ is the message processing latency (how long it takes to receive a message and produce an ...

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As you've mentioned, it depends on the trading venue and the exact market data product that you're subscribed to. Unless otherwise stated, the data is usually updated at every occurrence of an event (explains the irregualr intervals), and often, the data is not disseminated immediately and multiple events may be batched in a single message informing you of ...

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The adopting release of Reg NMS http://www.sec.gov/rules/final/34-51808.pdf discusses the problem(s) they were looking to solve. That will provide the SEC's thought process.

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No. 10 shares from Order1 have time priority. The 100 shares of Order2 will trader after 10 from Order1. The 90 hidden shares of Order1 are hidden, and therefore at the back of the queue. When they light, they get in line at the back.

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Quote: Starting in 2003, the NYSE started disseminating automatically, with a software called autoquote, any change in the best quotes in its listed stocks. Before that specialists had to update manually new inside quotes in the LOB. This implementation considerably accelerated the speed at which algorithmic traders receive information Endquote Source: ...

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To slice up an order you can use several execution strategies. TWAP which will execute small slices of your order over a time period VWAP which will spread your order over time and try to minimize slippage against the vwap benchmark for a given instrument POV which will split your order up into smaller chunks and attempt to keep your order filled as a ...

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Most of the big players offer a suite of execution algorithms for big orders, as seen in this listing from Credit Suisse. Very generally speaking, the algorithms will have a pedigree going back to volume weighted average pricing schedules, or perhaps to the famous paper by Almgren and Chriss. They have various modifications, including use of "unusual" ...

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Only the transactions affect the account. See example implementation below. The position and money should be initialized at the beginning. Note that both of them, and also quantity can be positive and negative. public static class PNL { private double position = 0; // number of BTC private double money = 0.0; // USD public double get_position() ...

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Every match that hits the tape from the perspective of displayed ECNs is a market order matched with a limit order. You can think of this in terms of makers and takers. If I want to buy MSFT at 51.00 and post a limit for that price 3 microseconds before you post your limit to sell at 51.00 then I am the maker and you are the taker. And your sell order will ...

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It can be a couple things depending on what you are looking at: If you are looking at a single exchange's feed, it can be a Trade Message that isn't linked to any individual order ID. These can be things like block orders or off exchange orders that get reported to them. I usually ignore Trade messages when looking at intraday data. These are different from ...

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If memory serves correctly, the cran package "orderbook" was for NYSE's TAQ (Transactions and Quotes) database. the limit order book is the aggregation of latent demand in the market. For you to construct the limit order book you face a few (!) challenges. 1) Parsing itch raw messages (casting in the case of version 5.0) and 2) constructing the actual ...

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Having locked markets is bad in the sense it freezes the price formation process. Ideally we would like to have a price on as much instruments as possible so that we know their value. it prevent investors to buy (or sell) it and thus adds frictions, transaction costs, etc. We would like to enable investors to buy or sell when they need/want, to let the ...

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On BATS, your market order would be rejected back to you with an error "No Liquidity".

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