Limit Order Book Trading Strategy

Limit Order Book (LOB) trading strategy is a popular approach used by traders to gain insights into market dynamics and make informed trading decisions. The LOB is a real-time record of all buy and sell orders in a particular market, which allows traders to see the supply and demand of an asset. By analyzing the LOB, traders can determine the liquidity of the market, spot trends and patterns, and identify trading opportunities.

What is the Limit Order Book Trading Strategy?

A limit order book (LOB), also known as the central limit order book (CLOB), is a computerized bookkeeping system kept by an exchange that displays all buy and sell limit orders for a specific asset — stocks, futures, bonds, cryptocurrencies, and so on. Trading based on order flow is the limit order book trading technique.

Each exchange keeps an order book for each security that is mentioned on it. Every limit order submitted to an exchange is recorded in the order book and includes the following information:

  • The security’s ticker symbol.
  • The direction of the order — a buy or a sell order.
  • The limit price.
  • The trade size — the number of shares to buy or sell in the instance of a stock.

The order book is usually divided into the following categories:

  • The buy limit orders (Bids) — from the highest to the lowest prices.
  • The sell limit orders (Asks or Offers) — from the lowest to the highest prices.

Reading the Limit Order Book

Reading the Limit Order Book (LOB) can be a complex task, but it is crucial for traders who want to gain insights into market dynamics and make informed trading decisions. Here are some steps to help you read the LOB:

  1. Understand the LOB structure: The LOB is organized in two columns – the bid and the ask. The bid represents the highest price buyers are willing to pay for an asset, while the ask represents the lowest price sellers are willing to accept. The bid and ask are organized by price level, with the highest bid and lowest ask at the top of each column.
  2. Analyze the bid-ask spread: The bid-ask spread is the difference between the highest bid and the lowest ask. It is an important indicator of market liquidity, as a wider spread indicates lower liquidity, while a narrow spread indicates higher liquidity. Traders should pay attention to changes in the spread as they can signal changes in market sentiment.
  3. Look at the order sizes: The LOB also displays the order sizes for each bid and ask level. Large order sizes at a particular price level can indicate strong support or resistance, while smaller sizes may be more easily filled.
  4. Monitor the time and sales data: Traders should also monitor the time and sales data, which shows the executed trades for the asset. This data can help traders confirm trends or identify reversals.
  5. Watch for changes in the LOB: Changes in the LOB, such as the addition or removal of large orders, can signal changes in market sentiment and can provide valuable insights into trading opportunities.

By understanding how to read the LOB, traders can gain a deeper understanding of market dynamics and use this information to make informed trading decisions.

Limit Order Book (LOB) Example
Limit Order Book (LOB) Example

Limit Order Book Trading Pros & Cons


  1. Enhanced market insights: LOB trading allows traders to gain a deeper understanding of market dynamics by providing real-time data on supply and demand, as well as order sizes and trade executions.
  2. Precise entry and exit points: LOB trading enables traders to place orders at specific price levels, which can help them enter and exit positions with greater precision.
  3. Reduced slippage: By placing limit orders at specific price levels, traders can reduce slippage, which occurs when the execution price differs from the expected price due to changes in market conditions.
  4. Increased flexibility: LOB trading allows traders to adjust their orders in real-time based on market conditions, providing greater flexibility in managing their positions.


  1. Execution risk: LOB trading involves execution risk, where orders may not be executed as intended due to changes in market conditions or lack of liquidity.
  2. Information asymmetry: Some traders may have access to more advanced tools or faster data feeds, giving them an advantage over others and resulting in information asymmetry.
  3. Manipulation risk: The LOB can be subject to manipulation by market participants, which can result in false signals and unexpected losses.
  4. Complexity: LOB trading can be a complex and time-consuming process, requiring traders to constantly monitor the LOB and make quick decisions.
  5. Dependence on technology: LOB trading relies heavily on technology, and technical failures or glitches can result in unexpected losses.


LOB trading can be a powerful tool for traders, but it also involves significant risks and challenges. Traders need to have a strong understanding of market dynamics and risk management techniques to be successful in LOB trading. It is also important to constantly monitor the market and adapt to changing conditions.

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