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  2. Trading Glossary
  3. Order Book

Order Book

An order book is an organized set of current buy and sell instructions, commonly grouped by price and displayed quantity for a market.

Defined termReviewed 16 July 2026

Related terms

Ask PriceBid PriceLiquidityMarket MakerQuoteBid-Ask Spread

Educational risk notice

This material is general education, not personal investment advice or a promise of results. Markets can move beyond planned levels, and losses can exceed expectations when leverage, liquidity, gaps, or operational failures are involved.

Read the full risk disclosure
Trading glossaryReviewed 16 July 2026

Definition

An order book is an organized set of current buy and sell instructions, commonly grouped by price and displayed quantity for a market.

In market context

The best bid and ask appear at the top, while deeper levels show additional stated interest at less competitive prices. Displayed depth is not fixed: orders can execute, cancel, change, remain hidden, or exist on other venues. The book therefore offers a snapshot of available instructions rather than a guarantee that the shown quantity will remain when another order arrives.

Source

Use the primary source for fuller regulatory or market context.

Investor.gov — How Stock Markets Work

Educational risk notice

This material is general education, not personal investment advice or a promise of results. Markets can move beyond planned levels, and losses can exceed expectations when leverage, liquidity, gaps, or operational failures are involved.

Read the full risk disclosure

Related glossary terms

Selected from explicit term relationships and shared tags.

beginner3 min

Ask Price

The ask price is the lowest displayed price at which a seller is currently offering to sell an instrument in a quoted market.

markets · pricingRead guide
beginner3 min

Bid Price

The bid price is the highest displayed price at which a buyer is currently offering to purchase an instrument in a quoted market.

markets · pricingRead guide
beginner3 min

Liquidity

Liquidity is the ability to transact a meaningful quantity promptly near prevailing prices without causing a disproportionate price change in the wider market.

markets · executionRead guide
beginner3 min

Market Maker

A market maker is a participant that regularly quotes prices at which it is willing to buy and sell specified instruments.

markets · executionRead guide