Bid and Ask Price: What They Mean & How the Spread Works

What Are the Bid and Ask Prices?

Every stock has two prices at any given moment: the bid price and the ask price. The bid is the highest price that a buyer is currently willing to pay for a share. The ask (also called the offer) is the lowest price that a seller is currently willing to accept.

When you see AAPL quoted at $185.50 x $185.52, the bid is $185.50 and the ask is $185.52. A buyer is standing ready to purchase shares at $185.50, and a seller is offering shares at $185.52. The two cents between them is the spread.

This two-price system exists because buyers and sellers rarely agree on an exact price at the same instant. The bid represents demand, and the ask represents supply. A trade occurs only when a buyer agrees to pay the ask price or a seller agrees to accept the bid price.

If you place a market order to buy, you will be filled at the ask price. If you place a market order to sell, you will be filled at the bid price. This means the spread is an immediate cost to you on every trade.

Reading a Level 2 Quote

A Level 2 quote shows the full depth of the order book beyond just the best bid and ask. It reveals all the resting buy and sell orders at various price levels, giving you a picture of where supply and demand are stacked.

Here is what a Level 2 display might look like for NVDA trading near $875:

Bid Side (Buyers):

• $875.00 — 500 shares
• $874.95 — 1,200 shares
• $874.90 — 800 shares
• $874.80 — 3,000 shares
• $874.50 — 5,500 shares

Ask Side (Sellers):

• $875.05 — 400 shares
• $875.10 — 900 shares
• $875.15 — 600 shares
• $875.25 — 2,800 shares
• $875.50 — 4,200 shares

The spread here is $0.05 ($875.05 - $875.00). Notice the 3,000-share bid at $874.80. That cluster of buying interest acts as short-term support. On the ask side, 2,800 shares at $875.25 represents a wall of supply the stock needs to absorb before advancing.

What Is the Bid-Ask Spread?

The bid-ask spread is the difference between the best ask and the best bid. It is the most basic measure of a stock's liquidity and your cost of doing business.

For heavily traded stocks like AAPL, MSFT, or SPY, the spread is typically one cent. For thinly traded small-cap stocks, the spread can be $0.10, $0.50, or even several dollars.

The spread matters because it is a cost you pay on every round trip. If you buy at the ask and immediately sell at the bid, you lose the spread. On a stock with a $0.01 spread, that cost is negligible. On a stock with a $0.25 spread, you are starting every trade $0.25 in the hole per share.

You can also express the spread as a percentage to compare across stocks at different price levels:

A $0.05 spread on a $10 stock (0.50%) is far more expensive in relative terms than a $0.05 spread on a $500 stock (0.01%). For a deeper analysis of how spreads impact trading costs and strategies to minimize them, see the full guide on bid-ask spread.

How Market Makers Work

Market makers are firms that continuously provide both bid and ask quotes for a stock. They commit to buying at the bid and selling at the ask, earning the spread as compensation for providing liquidity.

When you sell 100 shares of TSLA, a market maker may be the one buying from you at the bid. When another trader wants to buy 100 shares a moment later, the market maker sells to them at the ask. The market maker pockets the spread on each round trip.

Market makers take on risk because the stock can move against them while they hold inventory. If a market maker buys 1,000 shares at $250.00 and the stock suddenly drops to $248.00, they are sitting on a $2,000 loss. To compensate for this risk, they widen the spread on volatile or illiquid stocks.

This is why spreads widen during earnings announcements, market opens, and periods of high uncertainty. The market makers are pricing in higher risk by demanding a larger cushion between their buy and sell prices.

Why the Spread Matters for Your Orders

The spread directly affects which order type you should use.

A market order guarantees execution but not price. You will buy at the ask or sell at the bid, whatever those prices are at the moment your order reaches the exchange. In fast-moving markets, the ask can jump between the time you click "buy" and the time your order is filled. This is called slippage.

A limit order guarantees price but not execution. You specify the exact price you are willing to pay. If the stock never reaches your price, your order goes unfilled. But you avoid paying more than you intended.

For liquid stocks with penny spreads (SPY, QQQ, AAPL), market orders are generally fine for small positions. The spread cost is negligible.

For less liquid stocks or larger position sizes, always use limit orders. A market order for 5,000 shares of a thinly traded stock can eat through multiple levels of the order book, resulting in a much worse average price than the displayed ask.

Factors That Affect Spread Width

Several factors determine how wide or narrow a stock's spread will be:

• Trading volume: High-volume stocks have tighter spreads. SPY trades hundreds of millions of shares daily and has a $0.01 spread. A micro-cap stock trading 50,000 shares daily might have a $0.20 spread.
• Volatility: Higher volatility leads to wider spreads because market makers face more inventory risk.
• Time of day: Spreads are widest at market open and in the final minutes of trading. They are tightest during the midday session when volatility is lowest.
• Market conditions: During market crashes or extreme uncertainty, spreads widen across the board. Even blue-chip stocks can see spreads expand from $0.01 to $0.10 or more.
• Stock price: Higher-priced stocks tend to have wider absolute spreads but narrower percentage spreads.

Understanding spread dynamics helps you choose better times to trade and select stocks where trading costs will not erode your edge. Combine this knowledge with proper risk management to protect your capital on every trade.

FAQ

Is the spread a fee I pay to my broker?

No. The spread is not a broker fee. It is the cost of immediacy in the market. When you use a market order, you accept the current ask or bid price, and the difference goes to the market maker or other trader on the other side. Your broker may charge a separate commission on top of the spread, though many brokers now offer commission-free trading.

Why do some stocks have very wide spreads?

Wide spreads indicate low liquidity. The stock has few active buyers and sellers, so market makers widen the spread to compensate for the risk of holding inventory in a thinly traded security. Stocks with wide spreads include micro-caps, after-hours quotes, and newly listed companies. Avoid trading these unless you use strict limit orders.

Can I see the bid and ask prices before placing a trade?

Yes. Every brokerage platform displays the current bid and ask prices for any stock you look up. Most also show Level 1 data (best bid and ask with sizes) by default. Level 2 data, which shows the full depth of the order book, is available as an add-on from most brokers for a small monthly fee or free with certain account types.