Depth of Book
Detailed buy and sell order data across price levels on an ATS.
Depth of Order Book Data for equity security on an Alternative Trading System (ATS) provides detailed information about buy and sell orders in the market for a specific stock. The Depth of book data means all quotation sizes at each Alternative Trading System at each of the next price levels at which there is a bid that is lower than the Alternative Trading System (ATS) best bid and that is higher than the best offer of the ATS.
Liquidity Information: The depth of order book data can be used to assess the liquidity of a stock. A deep order book (with many orders at various price levels) usually indicates higher liquidity, meaning it's easier to execute large orders without significantly impacting the stock's price.
Price Discovery: This data aids in the price discovery process, as traders can see at what price levels the market is willing to buy or sell, and how this changes over time.
Here are the key details:
- Order Levels: The data is organized into different levels, with each level representing a price point at which buy or sell orders are waiting to be executed. The most basic order book might show just the best bid and ask prices (Level 1), but a full-depth order book can show many levels beyond that.
- Bid and Ask Prices: These are the prices at which buyers are willing to buy (bid) and sellers are willing to sell (ask). In the depth of order book, you'll see multiple bid and ask prices at various levels.
- Order Size: For each bid and ask price, the data includes the number of shares (or the order size) that traders are willing to buy or sell. This information can give an idea of the market depth at different price levels.
- Time Stamp: Each order in the book typically has a timestamp, indicating when the order was placed. This can be important for understanding the sequence of orders and the market's reaction to news or events.