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Market Depth (Order Book)

intermediate6 min read

The five buyers and five sellers waiting in line — and what their sizes hint at.

The market depthThe live list of buy and sell orders for a stock. window (often the “5×5” or “20×20”) shows the top pending buy orders (bids) and sell orders (asks) with their prices and quantities. It’s a live snapshot of supply and demand right around the current price.

The best bid and best ask sit at the top; the gapA jump between one bar’s close and the next bar’s open. between them is the spreadThe gap between the highest buy price and lowest sell price.. Big quantities stacked on the buy side hint at supportPrice zones where buying (support) or selling (resistance) tends to dominate.; big sizes on the sell side hint at resistancePrice zones where buying (support) or selling (resistance) tends to dominate. — pressure waiting to be absorbed.

Depth is useful, but treat it with caution: large orders can be placed to create a false impression and pulled before filling (spoofing). It shows intent at this instant, not destiny. For long-term investors it barely matters; for active traders it’s a tactical read, not a crystal ball.
Key takeawayMarket depthThe live list of buy and sell orders for a stock. shows pending bids/asks and their sizes — a live read of near-term supply/demand, but it can be fleeting or misleading, so don’t over-trust it.
FAQs
Do I need to watch market depth as a long-term investor?

Not really. For occasional investing in liquid stocks, a limit order at a sensible price is enough. Market depth mainly helps active/intraday traders gauge immediate liquidity and likely short-term pressure.