What it means
Every traded market quotes two prices at once. The bid is what you can sell into immediately, the ask, sometimes called the offer, is what you must pay to buy immediately, and the ask is always the higher of the two.
The difference is a real cost that comes out of your pocket the moment you trade. That gap is how market makers earn their living.
They stand ready to buy at the bid and sell at the ask, pocketing the spread as compensation for holding inventory and carrying the risk that prices move against them. Wider spreads mean more compensation, which is why thin, rarely traded assets carry the widest gaps.
Spread size is a good proxy for liquidity, meaning how easily something can be bought or sold without moving the price. Heavily traded shares can quote a spread of a few cents on a $50 stock, while a small company's shares or an unusual bond might quote several per cent.
For a business treasurer or an investor, that difference decides how expensive it is to change your mind. The published ask usually applies only to a stated quantity.
Try to buy far more than the quoted size and you will fill the first tranche at the ask, then progressively higher, which is the effect known as slippage. Large orders are therefore worked over time or negotiated privately rather than sent to the market in one lump.
The same two sided logic appears far from stock markets. Currency dealers, car dealers, property agents and business brokers all quote a price at which they will sell that sits above the price at which they will buy, for exactly the same reason.
In practice
Real-world examples.
Example
A finance director buying $2,000,000 of a corporate bond finds the ask is 1.5% above the mid price, costing roughly $30,000 in spread alone. She splits the purchase across three dealers to get a tighter quote.
Example
A retail investor places a market order in a small listed company at the open and fills at an ask $0.40 above the previous close. The share price had not moved; the spread had simply widened before enough buyers and sellers arrived.
Example
A treasury team converting $5,000,000 into euros compares the ask quoted by its bank against the mid market rate shown online. The 0.35% gap represents $17,500, which prompts a request for a better rate on future conversions.
Think of it
“Ask is what sellers want-the price at which you can buy.
Formula
Calculation
Bid-ask spread = ask price - bid price, and spread percentage = (ask - bid) / mid price x 100, where the mid price is the average of the two.
A share is quoted with a bid of $24.90 and an ask of $25.10. The spread is $25.10 - $24.90 = $0.20, the mid price is ($24.90 + $25.10) / 2 = $25.00, and the spread percentage is $0.20 / $25.00 x 100 = 0.8%.
An investor buying 10,000 shares at the ask pays 10,000 x $25.10 = $251,000, against a mid price value of 10,000 x $25.00 = $250,000. The $1,000 difference is the immediate cost of crossing the spread, and selling straight back at the bid would cost another $1,000.Case study
Seen in the real world.
This is an illustrative and fictional example. Merrow Capital, an invented boutique fund, ran a strategy that turned over its whole portfolio roughly six times a year across a basket of small company shares where the average spread was 1.2% of the mid price.
The manager reported gross returns of 11% and could not understand why investors were seeing closer to 4%. A trading cost review in this fictional scenario showed that crossing a 1.2% spread on both the buy and the sell, six times a year, was quietly consuming several percentage points of return before fees were even counted.
Merrow's illustrative response was to cut turnover, use limit orders that sat inside the quoted spread rather than paying the ask outright, and screen out the least liquid names entirely. The gross return fell slightly, but what investors actually received improved.
Watch out
Common mistakes.
- Reading a single quoted share price in the press and assuming that is what you would pay, when a buyer pays the ask and a seller receives the bid.
- Ignoring the spread as a trading cost because it never appears as a line item on a contract note the way commission does.
- Assuming the quoted ask holds for any order size, when the displayed price usually covers only a limited quantity.
Questions
People also ask.
Is the ask price the same as the offer price?
Yes, the two terms mean the same thing and are used interchangeably depending on the market and the country.
Why do spreads widen at certain times?
Uncertainty widens them, so spreads are typically widest at the market open, around news announcements and during periods of stress.
Can I buy below the ask?
Sometimes, by placing a limit order inside the spread and waiting, though you take the risk that the order is never filled.
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