The ask is the lowest price a seller is currently willing to accept for a security, fund, currency or crypto asset. On a quote screen it is the offer price available to you if you want to buy immediately.
Traders also call it the offer. The best ask is the cheapest available offer at that moment, and the ask size shows how many units are available at that price.
Ask vs bid and the spread you pay
Every liquid market shows two sides. Buyers post bids, sellers post asks. The best bid is the highest price any buyer is offering. The best ask is the lowest price any seller is asking. The gap between them is the bid ask spread.
If you buy right now using a market order, you usually pay the best ask. If you sell right now, you usually receive the best bid. That spread is the friction you cross to trade instantly, and it tends to be narrower in deep, highly traded markets and wider in thin ones.
Some traders watch the mid price, which is the average of the best bid and best ask. It is a useful reference, but it is not a price you can necessarily trade at without providing liquidity.
Where you see the ask on a platform
Most platforms show at least a Level 1 quote: last traded price, best bid, best ask and often the sizes. An order book or Level 2 screen goes deeper. You will see multiple price levels on the ask side, each with a quantity sellers are offering at that price.
- Best ask: the lowest active selling price.
- Ask size: how many shares, contracts or coins are for sale at that best price.
- Depth: the next few ask prices above the best, with their sizes.
Quotes can update many times per second. In fast markets the best ask can move or disappear before you click. Some platforms aggregate prices from several venues. The exact display and routing vary by provider and market.
If you want to react without watching the screen, you can set trading alerts that trigger when the ask hits a level you care about.
How orders interact with the ask
Buying at market means your order will try to match against the best ask first, then the next best, and so on until your full size is filled. If your order is larger than the ask size, you can get partial fills at multiple prices. That is slippage.
Buying with a limit order gives you control over price. A buy limit will only execute at your limit price or better. Place a buy limit at or above the current best ask and you will usually get filled straight away, starting at the best ask. Place it below the best ask and it will sit in the book on the bid side and only fill if sellers lower their price to meet you.
Selling works in reverse. A sell at market hits the best bid. A sell limit at or below the best bid will usually fill immediately. A sell limit above the best ask posts on the ask side and waits for buyers to lift it.
Orders also have instructions, such as time in force. For example, fill-or-kill and immediate-or-cancel handle partial fills differently. Behaviour can vary by venue and provider.
What affects the ask price
Several forces shape the ask at any moment:
- Liquidity: More active participation means more sellers competing to offer the lowest price, which can narrow the spread.
- Volatility and news: When prices are jumping around, sellers may widen their asks to offset risk.
- Inventory and risk of market makers: Firms that quote both sides manage their stock and risk, adjusting asks accordingly.
- Trading session and auctions: Opening and closing periods, or overnight trading, often show wider spreads and lighter size.
- Venue fragmentation: In markets with multiple exchanges or liquidity pools, the best ask you see may reflect a single venue or a consolidated view, depending on your provider.
Crypto markets trade around the clock and across many venues. Traditional equities have defined sessions. These structural differences influence how quickly the ask updates and how much size sits at each level.
Worked example: buying at the ask
Imagine a stock with the following top-of-book quotes:
| Side | Price | Size |
|---|---|---|
| Bid | 99.98 | 1,000 |
| Ask | 100.02 | 600 |
| Next ask | 100.05 | 1,200 |
The mid price is 100.00. You place a market buy for 800 shares. The system fills 600 at 100.02 and the remaining 200 at 100.05. Your average fill price is 100.0275. You have paid the spread and a little slippage because your order was larger than the best ask size.
If you had instead placed a buy limit at 100.02, you would still have bought 600 shares at 100.02 and left 200 unfilled. You could then decide to adjust your order or wait for sellers to improve their asks.
Similar phrases you may hear
- Offer: Another term for ask. Lifting the offer or hitting the ask means buying from the seller at the quoted ask price.
- Inside quote: The current best bid and best ask together.
- Ask size: The quantity available at the best ask. If your buy order is larger, expect fills at higher ask levels.
- Last price: The price of the most recent trade. It may be at, above or below the current ask, depending on which side that trade hit. Do not assume the last is a tradable price right now.
- Mid price: The simple average of best bid and best ask. It is a reference point, not a guaranteed execution level.
Practical tips for using the ask
- Check both price and size. A tight ask with tiny size can still lead to slippage on a larger order.
- Use limit orders if you need price control, especially in thin or volatile markets.
- Watch how the ask reacts around news and at session opens and closes. Spreads often widen and depth can thin out.
- On multi-venue assets, confirm whether your platform shows a consolidated best ask or only one venue. Execution and quote handling vary by provider.
- Consider setting alerts when the ask touches your target so you can choose how to trade rather than chasing fast moves.