Glossary term
Bid and Ask
Bid and ask are the quoted prices at which buyers are willing to buy and sellers are willing to sell.
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What Are Bid and Ask?
Bid and ask are the two sides of a market quote. The bid is the highest price a buyer is currently willing to pay. The ask is the lowest price a seller is currently willing to accept.
The difference between the bid and ask is the spread. A narrow spread usually suggests stronger liquidity. A wide spread can signal lower liquidity, higher volatility, larger transaction costs, or uncertainty about fair value.
Key Takeaways
- The bid is what buyers are willing to pay.
- The ask is what sellers are willing to accept.
- The bid-ask spread is the difference between the two prices.
- Market orders often execute near the opposite side of the quote.
- Wide spreads can make trading more expensive, especially in thin markets.
How Bid and Ask Work
If a stock is quoted at $20.00 bid and $20.05 ask, buyers are currently bidding $20.00 and sellers are asking $20.05. An investor who wants immediate execution may buy at or near the ask or sell at or near the bid, depending on available liquidity and order routing.
A limit order lets the investor choose a price, but it may not fill. A market order prioritizes execution, but the final price can be worse than expected if the quote changes or available shares are limited.
Quote size matters too. A bid may show only a limited number of shares available at the displayed price. A larger order may execute across several price levels, increasing the effective cost for the full trade.
Bid-Ask Spread Example
Quote item | Example | Meaning |
|---|---|---|
Bid | $20.00 | Highest current buyer price |
Ask | $20.05 | Lowest current seller price |
Spread | $0.05 | Difference between ask and bid |
Midpoint | $20.025 | Approximate middle of the quote |
Why It Matters
Bid and ask prices affect real transaction costs. A security can show a last trade price, but that does not mean an investor can buy or sell a meaningful amount at that exact price.
The spread is especially important for ETFs, options, thinly traded stocks, bonds, and volatile markets. Even if commissions are zero, the spread can still be a cost of trading.
Limits and Misunderstandings
Quotes can change quickly. A displayed bid or ask may not be available by the time an order reaches the market, and the size available at that price may be limited.
The last price is not the same as the current bid or ask. The last price shows a past trade. The bid and ask show current buying and selling interest.
The Bottom Line
Bid and ask quotes show where buyers and sellers are currently willing to trade. Understanding the spread helps investors see liquidity, execution risk, and the hidden cost of entering or exiting a position.