Trading

Market Depth

By Ryan Silk & Lawrence Polatchek · Reviewed April 2026 · Options Trading Glossary

Volume of orders at various price levels

What is Market Depth?

Market Depth The quantity of buy and sell orders at various price levels in the order book. Deep markets have substantial orders at many price levels, indicating strong liquidity. In options, market depth varies significantly across strikes and expirations, with ATM near-term options typically having the most depth.

Complete Definition

The quantity of buy and sell orders at various price levels in the order book. Deep markets have substantial orders at many price levels, indicating strong liquidity. In options, market depth varies significantly across strikes and expirations, with ATM near-term options typically having the most depth.

Related Terms

Level 2 Data Liquidity Bid Ask Spread

Written by

ApexVol Research Team

Quantitative options research

All calculations use live ORATS institutional data — the same source used by professional volatility desks.

Technical reviewer

Ryan Silk, ApexVol Founder

Reviewed for technical accuracy

10+ years trading options. Built ApexVol's pricing engine, Greeks model, and IV-rank methodology.

This guide is updated as market conditions and ORATS data change. Last revised 2026-05-12. How we research →

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