# What Is Depth of Market? Understanding DOM Data and Its Uses

## What Is Depth of Market (DOM)?

Depth of market (DOM) is a trading metric that measures the supply and demand for [liquid](https://www.investopedia.com/terms/l/liquidity.asp), tradable assets, such as stocks or [futures contracts](https://www.investopedia.com/terms/f/futurescontract.asp), by showing the number of open buy and sell orders at various price levels.

Also called the [order book](https://www.investopedia.com/terms/o/order-book.asp), DOM helps traders gauge real-time market liquidity and anticipate how large buy or sell orders might impact an asset's price. Most online brokers offer DOM data, often for free or a small fee, making it a valuable tool for informed trading decisions.

### Key Takeaways

*   Depth of market (DOM) indicates the liquidity level of an asset by displaying the volume of buy and sell orders at various price points. This can help traders assess how easily they might enter or exit a position without causing significant price changes.
*   Real-time DOM data allows traders to make informed decisions by analyzing pending orders and the likely price direction of assets, thus enabling strategic entry or exit from trades.
*   DOM is essential for understanding the order book, offering insights into bid-ask spreads and trade volumes, which directly impact investment strategies.
*   Highly liquid assets, such as those of large-cap companies, generally show greater depth of market, allowing large trades with minimal impact on price. Conversely, assets with low market depth, typically smaller or less-known companies, can experience significant price shifts from large trades.
*   Monitoring the DOM during events like initial public offerings (IPOs) can provide traders with advantageous opportunities by observing price volatility and reacting to shifts in market demand.  
    

## Analyzing Market Depth: Insights and Implications

Traders use market depth to assess where an asset's price might go by measuring real-time supply and demand. It helps gauge how many shares can be bought without raising the asset's price.

If a stock is extremely liquid, it has a large number of both buyers and sellers. A buyer can purchase a large block of shares without causing a substantial stock price movement. When a stock isn't very liquid, it trades less frequently. Purchasing a block of shares may have a noticeable impact on the stock's price.

Depth of market usually appears as an electronic list of buy and sell orders, organized by price and updated in real-time. A matching engine pairs up compatible trades for completion.

Many online brokers provide some type of DOM display. This lets users view all pending buy and sell orders and trade sizes, not just the top options.

### Leveraging Depth of Market Data for Trading

Traders can use depth of market data to predict short-term price movements as orders change. A trader might use market depth data to understand the [bid-ask spread](https://www.investopedia.com/terms/b/bid-askspread.asp) for a stock, along with its current [volume](https://www.investopedia.com/terms/v/volume.asp).

Stocks with a strong depth of market tend to be popular large-cap companies like Apple ([AAPL](https://www.investopedia.com/markets/quote?tvwidgetsymbol=aapl)). They usually have strong volumes and are quite liquid, allowing traders to place large orders without significantly affecting their market prices.

Securities with poor depth of market often come from smaller, less well-known companies. The prices of their stocks are likely to move if a single trader places a large buy or sell order.

> **Important**
>
> The most popular stocks tend to have a greater depth of market than the stocks of lesser-known companies.

Being able to view the depth of market information for a particular security in real-time allows traders to profit from short-term price volatility. For example, when a company launches its initial public offering (IPO), traders can watch its DOM in real-time, waiting for the opportunity to buy or sell shares when the price reaches the right level of demand.

## Illustrating Depth of Market With an Example

Say a trader is tracking the DOM of Stock A. The shares might currently be trading at $1.00. But there are 250 offers at $1.05, 250 at $1.08, 125 at $1.10, and 100 at $1.12. Meanwhile, there are 50 offers at $0.98, 40 offers at $0.95, and 10 each at $0.93 and $0.92.

Seeing this trend, the trader might determine that Stock A is going higher. Armed with that knowledge, the trader can decide whether this is the right time to jump in and buy or sell the stock.

## The Bottom Line

Depth of market (DOM) is a key measure of market liquidity, showing all open buy and sell orders for a security or currency. By revealing supply and demand dynamics, DOM helps traders anticipate price movements and refine their trading strategies.

Accessible through most online brokers, often free or for a small fee, DOM is especially useful for executing large orders without significantly moving prices in highly liquid stocks like Apple (AAPL). For traders, monitoring DOM is invaluable for identifying short-term opportunities and reacting effectively during events such as IPOs or market surges.