The prioritized list of resting orders held by the exchange. Each limit order represents an obligation to buy or sell. The most common type of order book is prioritized first by price and them by time. Another variation is the price/size book, where larger size results in higher priority.

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6
votes
1answer
109 views

How do you calibrate a poisson arrival rate process?

Many papers in the microstructure literature assume an order arrival rate of the form $\lambda^a(\delta) = \lambda^b(\delta) = Ae^{-k\delta}$ That is, an order that's placed $\delta$ away from the ...
0
votes
1answer
67 views

Change of order size

For example I am put a limit order of size 10 at top bid. moments later, my algorithm detects we should have size of 50 here. So we request a update on this order. My question is, will we lose the ...
0
votes
1answer
76 views

Disclosure of the liquidity provider identity in ITCH

If you look into the description of Nasdaq ITCH data, you see two types of order entries in the book: Message of Type A and F. Under type F, you will see the identity of the market participant (MPID). ...
0
votes
0answers
42 views

Java limitbook implementation? [duplicate]

I am looking to create my own front-end. What is the best data structure/java swing object to represent a limit order book? currently I am using two JTables and loading best bid and qty data from a ...
1
vote
2answers
123 views

Quotes and Transactions Streams from Exchange

I have possibility of taking 2 types of real time streams from some exchange: bid-ask quotes (fresh quotes from order book) transaction log (transactions matched by exchange) I'm curious what ...
2
votes
1answer
491 views

open-source implementation of orderbook from FAST?

I'm looking for c/c++ implementation of OrderBook. I need implementation to reconstruct market data from FAST. I don't need to do "matching" because it already did by exchange, I only need to ...
4
votes
1answer
270 views

Deep bid ask orders

Why do I often see some very deep limit buys and limit sells in a limit book? For instance the bid-ask may be \$39.00-39.01 but I see some bids at \$20 or even \$10 and some ask at \$60 or even \$500. ...
0
votes
1answer
147 views

Question about weighted midpoint formula

The answers from these two replies seem to contradict each other. The first numerator is bidSize*bidPrice + askSize*askPrice but the second is bidSize*askPrice + askSize*bidPrice. Price functions ...
0
votes
0answers
32 views

Better formula than midpoint? [duplicate]

For fair market value one formula is to take midpoint of bid and ask. Is there a better formula that weights the bid size and ask size ? For example if stock A is trading at bid size 2000 at 10.10, ...
-1
votes
1answer
124 views

What is a resting limit order? [closed]

What exactly is a resting limit order? I could not find a definition on Wikipedia or Google.
1
vote
3answers
215 views

Trader's identity in a limit book

In a limit book like NASDAQ ITCH, can liquidity suppliers know the demand-side identity of a trader prior or after a trade? Knowing this will help me with my theoretical model that I am trying to ...
4
votes
5answers
201 views

FIX- what exactly do repeating groups represent?

I am trying to find out what is the purpose of "repeating groups" in FIX and what exactly do they represent? Are they all related to the same order and if so, why do you need repeated tags? If they ...
-2
votes
1answer
214 views

Order book depth views preferences: order-by-order vs. total aggregated volume by price levels

Which is best? Or is it irrelevant? Hi! Considering Level 2 Data (Market Depth), I want to understand the advantages to have all the order book on an order-by-order basis (or tick-by-tick basis) ...
2
votes
1answer
541 views

What exactly is an ISO order?

I have been looking this up and I feel like I keep running into different definitions. My understanding is that an ISO order is one which will get filled with the displayed quantity in a particular ...
2
votes
1answer
327 views

Does DOM trading using broker data make any sense?

Can I use DOM information from Interactive Brokers? Does it make sense? I assume that it makes sense to apply some volume based algorithms only then when you know this order book, that you can get ...
1
vote
1answer
210 views

PIQ estimation for FIFO limit order book

Assuming that one doesn't have any kind of priveleged data feed (i.e. info is depth of book and volume executed at bid and ask), is it inherently easier to more accurately estimate position in queue ...
1
vote
2answers
689 views

Calculating true value of a stock given the order-book and recent trades

I'm trying to calculate the 'true value' of a stock listed on an exchange. I have access to the limit order-book (containing all bid/ask quotes) and also all trades which have taken place (which ...
2
votes
1answer
104 views

Limits analysis

I have a few time series of models to analyse in terms of how far/close they are to their underlying limit. The limit is a simple value on the y-axis (always positive), and the series can act ...
6
votes
1answer
565 views

Why would a trader quickly flicker an order immediately preceding a tick away?

The Setup Assume the inside market is $15.15 \times 15.16$ and there is a very large bid order imbalance. For example, 30,000 shares bid across 100+ orders, 200 shares offered across 1 order; ...
3
votes
2answers
208 views

What does ABBO (Away best bid and offer) refer to?

I know what the NBBO is but I've seen mention of ABBO and I'm not sure what it means?
7
votes
1answer
2k views

What is an efficient data structure to model order book?

What is an efficient data structure to model order book of prices and quantities to ensure: constant look up iteration in order of prices retrieving best bid and ask in constant time fast quantity ...
4
votes
1answer
1k views

how do we estimate position of our order in order book?

how would you estimate your order in the exchange order book? The order of order events and acks is not deterministic or guaranteed. How could you write an algo to estimate accurately your position in ...
4
votes
1answer
274 views

What is a good source to learn the different nuances of electronic orders and their nature?

Today I was speaking with someone involved in high frequency trading. They were mentioning hidden orders, queue positions (which can be lost in the orderbook based on certain order modifications), ...
7
votes
2answers
1k views

Non-SQL methods for high-frequency accounting?

Does anyone know of any prior art for non-SQL data structures for high-frequency accounting, whether client, broker, or exchange-side? I'm thinking specifically of the problem of booking individual ...
7
votes
3answers
1k views

Limit order book size

I am trying to write a highly optimised limit order book and I wondered what sort of size I can expect for: Range of limit prices Number of orders at each limit price I am developing custom ...
11
votes
3answers
2k views

How are limit orders selected from the order book?

I'm sure there is a simple answer to this but I haven't had any luck with searches. I'm just wondering when someone places a market order which order(s) from the limit order book are selected to fill ...
9
votes
1answer
501 views

What techniques are used for testing order book implementations?

I am finishing the implementation of a limit order book for modeling NASDAQ. The order book works off of the ITCH feed. My question is what techniques are typically used for testing order books. I am ...
15
votes
6answers
3k views

What tools exist for order book analysis and visualization?

What tools exist for order book analysis and visualization? In particular, if one wanted to examine a limit order book and understand how it changes throughout the day where would you turn for ...
12
votes
4answers
3k views

Implementing data-structures in a Limit order book

I'm working on implementing a 'LOB' and I'm being very careful about choosing my data-structures so as to maximize performance. Using F# as an example, I need to consider a List versus Array for ...
11
votes
3answers
4k views

Control for bid/ask bounce in high-frequency trade data?

The bid-ask bounce is the bouncing of trade prices between the bid and ask sides of the market. It introduces a systematic bias to the data which can cause serious problems in analysis. What methods ...
8
votes
3answers
2k views

Order submission strategies of a rational market maker?

Consider a market maker that has decided to try to make a round-trip trade in stock A in order to capture the bid-ask spread. Assume furthermore that he has no current inventory in the stock A. To ...
6
votes
1answer
934 views

A generic limit order book: What are the most important queries it should be able to answer?

Assume a class LimitOrderBook which represents a limit order book in a trading system. To be able to represent the limit order book a data handler reads a feed ...
11
votes
3answers
622 views

What is the most effective way of determining & measuring the level of HFT activity in a stock in (close to) real time?

On a security by security basis, I want to be able to quantify the level of HFT activity (and later institutional & retail activity). Is it higher than it normally is? How much so? What would you ...