What Is Bid and Ask Price?
The bid and ask price shows the prices at which market participants are currently willing to buy and sell a stock.
The bid price is the highest displayed price a buyer is currently offering to pay. The ask price is the lowest displayed price a seller is currently willing to accept. The ask price may also be called the offer price.
For example, a stock quote might show a bid of $25.00 and an ask of $25.05. This means the highest displayed buying offer is $25.00, while the lowest displayed selling offer is $25.05.
You can think of the two prices as a negotiation. A buyer says, “I will pay $25.00.” A seller says, “I will accept $25.05.” A trade happens when someone agrees to trade at an available price or when a buyer and seller submit prices that match.
The bid and ask are not fixed values. They can change many times as investors submit, cancel, or complete orders.
How Does Bid and Ask Price Work?
Investors send orders through brokerage firms. A brokerage firm is a company that provides access to financial markets. The broker routes eligible stock orders to places where trades can be completed, such as stock exchanges and other trading venues.
Orders that have not yet been completed may contribute to the available buying and selling interest in the market. This collection of orders is often called an order book.
The Bid Side
The bid side contains offers from buyers. Each buyer may specify a price and a number of shares.
Suppose one buyer offers $19.95 per share and another offers $20.00. The $20.00 offer is more competitive because a seller would generally prefer to receive the higher price. It may therefore become the best displayed bid.
When several buyers offer the same price, the market may use rules involving order arrival time and other factors to determine which order has priority.
The Ask Side
The ask side contains offers from sellers. A seller may specify the lowest price that the seller is willing to accept.
Suppose one seller offers shares at $20.08 and another offers shares at $20.05. The $20.05 offer is more competitive because a buyer would generally prefer to pay the lower price. It may therefore become the best displayed ask.
How a Trade Occurs
A trade occurs when a compatible buying order and selling order meet. A buyer who wants immediate execution may accept an available ask price. A seller who wants immediate execution may accept an available bid price.
However, the displayed quote does not guarantee that an entire order will be completed at that price. Only a limited number of shares may be available. Prices may also change before the order reaches the market.
Bid Size and Ask Size
A quote may show a bid size and an ask size. These figures indicate how many shares are displayed as available at the quoted prices, although quote displays may present share quantities in different formats.
For example, an ask of $30.10 may have 200 displayed shares available. If someone submits an order to buy 500 shares immediately, only part of the order may trade at $30.10. The remainder may trade against higher selling prices if sufficient shares are available there.
Displayed size can change quickly. Some buying and selling interest may not be visible in a basic quote. Therefore, quote size should not be treated as a complete picture of all market interest.
Simple Example
Assume the following figures are entirely hypothetical:
- Best displayed bid: $40.00
- Shares displayed at the bid: 300
- Best displayed ask: $40.06
- Shares displayed at the ask: 200
A person entering a market order to sell 100 shares would generally expect the order to interact with the bid. If the quote remains available and no better price is received, the sale could be completed at $40.00 per share.
A person entering a market order to buy 100 shares would generally expect the order to interact with the ask. Under the same assumptions, the purchase could be completed at $40.06 per share.
The difference between the two prices is called the bid-ask spread.
Bid-ask spread = Ask price − Bid price
Using the hypothetical figures:
$40.06 − $40.00 = $0.06 per share
The spread is six cents per share. A person who hypothetically bought 100 shares at $40.06 and immediately sold them at $40.00 would have a difference of $6 before considering price changes, fees, taxes, price improvement, or other trading effects.
This does not mean every round-trip trade will produce exactly that result. The quote may move, the order may receive a better price, or different prices may be available by the time the orders are processed.
What Happens With a Larger Order?
Assume the buyer submits a market order for 300 shares, but only 200 shares are displayed at the $40.06 ask. The first 200 shares might trade at $40.06. The remaining 100 shares might trade at the next available selling price, such as $40.08.
The average execution price would then be calculated by adding the total amount paid and dividing it by 300 shares:
[(200 × $40.06) + (100 × $40.08)] ÷ 300 = $40.0667 per share
Rounded to the nearest cent, that is about $40.07 per share. This example demonstrates why an order can receive more than one execution price.
Why Does Bid and Ask Price Matter?
The bid and ask price helps investors understand where immediate buying and selling interest is located. It is especially relevant when placing an order because the price shown as the stock’s “last price” may not be the price currently available.
The last price is the price of the most recently reported trade. That trade may have occurred seconds or longer ago, depending on how actively the stock trades. Current buyers and sellers may already be quoting different prices.
The spread can also provide limited information about liquidity. Liquidity describes how easily shares can generally be bought or sold without causing a large price change.
A narrow spread often appears when many participants are actively trading and competing on price. A wider spread may appear when trading activity is lower, uncertainty is higher, or fewer shares are available near the current market price.
However, the spread cannot measure liquidity perfectly. Displayed share quantities, order size, trading conditions, and available prices beyond the best quote also matter.
The bid and ask also cannot determine whether a stock is fairly valued. They show current trading interest, not the company’s profits, financial health, competitive position, or long-term prospects.
How Beginners Can Interpret Bid and Ask Price
Beginners should read the bid and ask as a changing snapshot rather than as guaranteed execution prices.
If a quote shows a bid of $15.20 and an ask of $15.24, the market is not necessarily saying that the stock has one exact value. It is showing the best displayed prices available from buyers and sellers at that moment.
A small dollar spread is not automatically small in percentage terms. A four-cent spread on a $2 stock represents a larger percentage of the share price than a four-cent spread on a $200 stock.
The percentage spread can be estimated using the midpoint between the bid and ask:
Midpoint = (Bid price + Ask price) ÷ 2
Percentage spread = (Ask price − Bid price) ÷ Midpoint × 100
The midpoint is simply halfway between the bid and ask. It is a reference value and is not necessarily a price at which a trade can occur.
There is no universal spread that is always good or bad. Typical spreads can differ based on the stock, share price, trading activity, market conditions, time of day, order size, and available liquidity.
Quotes can be especially unstable when the market is moving quickly. News, company announcements, economic reports, and sudden changes in buying or selling interest may cause bids and asks to change rapidly.
Limitations and Common Mistakes
Confusing the Last Price With the Ask Price
A common mistake is assuming that the last reported price is the amount a buyer will pay. A purchase normally interacts with available selling prices, beginning with the ask, rather than automatically receiving the last price.
Assuming the Quote Is Guaranteed
A displayed quote can change between the moment it appears on a screen and the moment an order arrives. Other orders may use the available shares first. This is one reason an execution price may differ from the price initially displayed.
Ignoring Order Size
The best bid or ask may apply to only a limited number of shares. A larger order may reach several price levels. The resulting difference between an expected price and the actual average execution price is one form of slippage.
Treating Every Spread the Same Way
Comparing only the spread in cents can be misleading. The stock price, percentage spread, displayed size, and normal trading activity should also be considered. Spreads may differ substantially between heavily traded stocks and securities with limited trading activity.
Assuming a Narrow Spread Means Low Investment Risk
A narrow spread may indicate active trading, but it does not mean the company or stock has low risk. Business losses, debt, competition, changing market conditions, and price volatility can still create substantial uncertainty.
Overlooking Market and Limit Orders
A market order seeks execution at the best available prices. It emphasizes execution but does not guarantee one exact price.
A limit order sets a maximum purchase price or a minimum sale price. It provides price control, but it may remain unfilled if the market never reaches the limit or if other orders have priority.
For example, if the ask is $12.10, a limit order to buy at $12.05 will not normally accept the $12.10 offer. The order may wait for a seller willing to accept $12.05. There is no guarantee that such a seller will appear.
Relying Only on Basic Displayed Quotes
A basic quote usually highlights the best displayed bid and ask. It may not show every available price level or every type of trading interest. Different data feeds may also update at different speeds or provide different levels of detail.
Quotes outside regular trading hours may have fewer participants, wider spreads, and less displayed liquidity. Conditions can therefore differ from those seen during the main trading session.
Related Beginner Terms
- Bid-ask spread: The difference between the ask price and the bid price.
- Market order: An instruction that seeks to buy or sell promptly at available market prices. The final price is not guaranteed.
- Limit order: An instruction to trade only at a specified price or better. Execution is not guaranteed.
- Last price: The price of the most recently reported trade, which can differ from the current bid and ask.
- Liquidity: The ability to trade shares without causing a large price change.
- Trading volume: The number of shares traded during a particular period. High volume does not always guarantee a narrow spread.
- Slippage: A difference between an expected trade price and the average price actually received.
- Market maker: A trading firm that may display prices at which it is willing to buy and sell. Other market participants can also submit orders that contribute to quotes.
- Volatility: The degree to which a security’s price moves over time. Fast-moving prices can make quotes change quickly.
FAQ
Is the bid price what I pay when buying a stock?
Usually not. A buyer seeking immediate execution generally interacts with the ask price because that is where sellers are offering shares. The final execution may differ because quotes and available quantities can change.
Is the ask price what I receive when selling?
Usually not for an immediate sale. A seller generally interacts with the bid, which represents current buying interest. A seller can use a limit order to request a higher minimum price, but the order may not be completed.
Why is the ask normally higher than the bid?
Buyers generally prefer to pay less, while sellers generally prefer to receive more. The difference between their best displayed prices creates the bid-ask spread. When compatible orders meet, trades can occur.
Can the bid and ask be the same?
They may briefly meet when compatible orders result in a trade, but the available orders can change immediately afterward. In a typical quote, the best displayed ask is above the best displayed bid.
Who sets the bid and ask prices?
Market participants create them by submitting buy and sell orders. These participants can include individual investors, institutions, professional trading firms, and market makers. No single participant permanently controls the prices.
Does a wide spread mean a stock is overpriced?
No. A wide spread describes the gap between current buying and selling offers. It does not measure the company’s underlying value. It may reflect limited liquidity, uncertainty, rapid market movement, or other trading conditions.
Will a market order always execute at the displayed bid or ask?
No. The displayed shares may no longer be available when the order arrives. A large order may also trade at several prices. The order could receive the displayed price, a better price, or a less favorable average price.
Does a limit order become part of the bid or ask?
It can, depending on the order’s price, routing, eligibility, and display rules. A buy limit order may contribute to buying interest, while a sell limit order may contribute to selling interest. Not every order is necessarily visible in a basic quote.
Key Takeaway
The bid and ask price shows the best displayed buying and selling prices available at a particular moment. The bid represents what a buyer is offering, while the ask represents what a seller is requesting. Their difference is the bid-ask spread.
This information helps a beginner understand possible immediate trading prices, liquidity, and why the last reported price may differ from an actual execution. Its main limitation is that it is only a changing snapshot. It does not guarantee a trading price or reveal whether a stock is fairly valued or suitable for a particular investor.
Sources
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Disclaimer
This article is for general educational and informational purposes only. It is not investment, financial, legal, or tax advice. It does not recommend buying, selling, holding, or avoiding any security or financial product. Financial information, quoted prices, and market conditions can change. Readers should verify current information and consider their own circumstances, objectives, and risk tolerance before making financial decisions.
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