How to Read Level 2 Market Data
Written by Brian Sov. — June 23, 2026
Level 2 market data provides a real-time, in-depth view of a stock's order book, displaying the multiple best bid and ask prices beyond just the top quote (Level 1). It reveals who is buying and selling, at what prices, and the exact volume of shares waiting to be traded.
Layout & Components of Level 2
A Level 2 window is divided into three key components. Click each below to learn what it shows and how traders interpret it.
The bid side represents all buyers currently willing to purchase shares. Each row lists a market maker or ECN, the price they are willing to pay, and the number of shares they want to buy. The highest bid is always displayed at the top.
- Shows demand pressure — more buyers = bullish signal
- Stacked rows reveal depth of support at each price level
- Large bid sizes may indicate institutional accumulation
- Bids disappearing quickly can signal a fake wall (spoofing)
- Market makers (e.g., NSDQ, ARCA, EDGX) are identified by their MMID
Level 2 Order Book Illustration
Below is a simulated Level 2 window for a fictional stock XYZ. The left side shows buyers (bids); the right side shows sellers (asks). The spread sits in the center.
Bid Side (Left)
Buyers and their prices. Highest bid = $50.04. Large GSCO bid of 5,000 shares may act as support.
Ask Side (Right)
Sellers and their prices. Lowest ask = $50.06. GSCO ask of 3,100 at $50.09 is a resistance wall.
Spread
$50.06 − $50.04 = $0.02. A $0.02 spread is very tight — XYZ is highly liquid and easy to trade.
How Traders Use Level 2 to Make Decisions
Level 2 is most powerful in the hands of active day traders and scalpers. Here are the key ways professionals interpret the order book to gain an edge.
Large clusters of bids at a specific price act as a support floor — price tends to bounce when it hits a heavily stacked bid wall. Conversely, a thick ask wall creates a resistance ceiling. Traders watch these walls to time entries and exits with precision.
When bids are rapidly stacking and asks are being swiftly consumed, it signals strong buying momentum. If the ask side starts thinning while bids build, a price breakout may be imminent. This is often one of the first signs before a fast upward move.
A spoofer places a very large bid or ask order to create a false impression of supply or demand, then cancels it before execution. Level 2 traders watch for large orders that appear and vanish quickly without being filled — a red flag that the signal is manufactured.
Experienced traders track specific market maker IDs (MMIDs) like NSDQ, ARCA, or GSCO. Certain market makers are known for being axed (directionally biased) in a stock. When a known axed MM is on the bid, it may indicate the stock will be supported at that level.
By comparing the total volume on the bid side versus the ask side, traders estimate order flow imbalance. A heavily weighted bid side suggests buyers are in control; a dominant ask side suggests sellers are. This helps traders decide whether to go long, short, or wait.
Day traders and scalpers use Level 2 to fine-tune their precise entry and exit points. Instead of buying blindly at market, a trader waits to see bids strengthen before entering long, or watches asks thin out before a breakout entry — minimizing slippage.