Glossary · PSX Mechanics
Ask Price
The lowest price a seller is willing to accept for a security. Also called the offer price. The difference between the ask and the bid price is called the spread.
01—What is Ask Price?
The definition — and what it means in practice.
The ask price is the lowest price a seller is willing to accept for a security. It is also called the offer price. On an exchange order book, multiple sellers may quote different asks at different quantities; the best (lowest) ask is the most competitive offer available. The gap between the ask price and the bid price (the highest price a buyer will pay) is called the spread.
The ask price matters because it influences the cost and speed of buying. A market buy order will typically execute at the best available ask, while a limit buy order can be set at or below a chosen price and may not fill if sellers do not meet it. Wider spreads usually indicate lower liquidity or higher uncertainty, which can raise trading costs and increase slippage.
If the bid is Rs 99 and the ask is Rs 100, buying immediately typically means paying Rs 100; the Rs 1 difference is the spread.
- Ask (offer) is the lowest price available from sellers in the market.
- The best ask is the lowest ask currently shown; it can change with new orders.
- Bid–ask spread is ask minus bid, a key indicator of liquidity and trading cost.
- Market buys generally fill at the ask; limit buys may wait for a matching seller.
02—How ask price works on the PSX
The Pakistan-specific rules, conventions, and numbers.
On the Pakistan Stock Exchange (PSX), the ask price is what you see on the sell side of the order book for a listed share. If you place a market order to buy, it will generally match against the best (lowest) ask available, subject to available quantity. If you place a limit order to buy, it will execute only if the market’s ask reaches your limit or a seller accepts your price.
Ask prices you see during the trading day can differ from prices in the pre-open session because orders are still being entered and matched. PSX also applies daily price limits (circuit breakers) for most equities around the previous close (LDCP), which constrains how far the ask (and bid) can move in a session. After a trade executes, settlement occurs on T+1 through the normal clearing and settlement process.
03—Common misconceptions
Where investors most often get this wrong.
The ask price is the price I will definitely buy at.
You will buy at the ask only if there is enough quantity at that ask when your order reaches the market. If the best ask quantity is small, the rest may fill at higher asks.
A tight spread always means the stock is low-risk.
A tight spread mainly signals better liquidity and lower transaction cost. It does not guarantee the company’s fundamentals are strong or that the price will be stable.
If I set my limit buy at the ask, it must execute immediately.
It usually executes quickly, but execution still depends on available volume and order priority. If the ask moves or is filled by others first, your order may wait.
04—Using ask price on BSL
Where this term shows up across the platform — with live data.
- Check live quotes and the buy/sell side on Stocks.
- Compare liquidity indicators across names using the Stock Screener.
- Track broad market conditions that can affect spreads via Market.
- Learn how pricing interacts with order types in Limit Order.
05—Frequently asked questions
What investors ask about ask price on the PSX.
Frequently Asked Questions
The ask price (offer price) is the lowest price at which someone is willing to sell a PSX-listed security. It appears on the sell side of the order book and is used to match buy orders.
The bid is the highest price a buyer is offering, while the ask is the lowest price a seller is offering. The difference between them is the bid–ask spread, which is a common measure of liquidity and trading cost.
Typically, yes: a market buy matches the best available ask first. If there is not enough quantity at the best ask, the order can fill across multiple higher ask levels.
The ask changes as sellers place, amend, or cancel orders, and as buyers trade against existing sell orders. News and changing supply-and-demand can also shift the prices sellers are willing to accept.
Yes. Daily price limits (circuit breakers) for most equities are set around the previous close (LDCP), which limits how high or low orders, including asks, can be placed and executed during the session.
06—Related terms
Keep building the picture.
The highest price a buyer is willing to pay for a security. The gap between the bid and ask price is the spread and represents the cost of trading.
The difference between the bid price and the ask price of a security. A narrow spread indicates high liquidity; a wide spread suggests lower liquidity and higher trading costs.
A real-time electronic record of all buy and sell orders for a security on the exchange, showing prices and quantities at each level.
An instruction to buy or sell a security at a specific price or better. The order is only executed if the market reaches the specified price, giving the investor control over the execution price.
An instruction to buy or sell a security immediately at the best available current price. Guarantees execution but not the price at which the trade is filled.
The ease with which a security can be bought or sold without significantly affecting its price. High-liquidity stocks have large trading volumes and narrow bid-ask spreads.
Put the term to work
Open a free BSL trading account
Understand the market, then trade it — live PSX data, screening tools, and a research desk that speaks plain English.