Bid vs Ask Price
The bid price is the most a buyer will pay; the ask price is the least a seller will accept. The gap between them — the spread — is your real cost to trade. You buy at the ask and sell at the bid, so every position starts a fraction underwater.
By Shoaib Shoukat · Updated June 2026
The spread is the cost
The spread is the simplest formula in trading:
Worked example. A stock is quoted $10.00 bid / $10.02 ask. The spread is $0.02. If you buy now you pay $10.02; if you immediately sold you'd get $10.00 — an instant 2-cent loss per share before the price has moved at all. On 1,000 shares that's $20 just to be in the trade. The price must rise above $10.02 before you're actually in profit.
Liquid markets (EUR/USD, large-cap stocks) have razor-thin spreads; thin or volatile markets have wide ones. A wide spread is a hidden tax on every trade — it's why instrument choice and execution quality matter as much as your strategy.
Why bid/ask decides prop firm outcomes
At a proprietary trading firm the spread isn't just a cost — it directly shapes whether you pass. Every time you cross the spread it comes out of your PnL, and PnL is exactly what the firm measures against your profit target and your drawdown limits. A scalper taking 20 trades a day pays the spread 20 times — so a firm with tight spreads and low commissions can be the difference between clearing an evaluation and quietly bleeding out.
When you compare firms, look past the headline profit split to the actual trading conditions — spreads, commissions and execution — because those decide your real net PnL.
Bid & ask FAQ
What is the difference between a bid and ask price?▾
The bid price is the highest price a buyer is currently willing to pay for an asset; the ask price (or 'offer') is the lowest price a seller is willing to accept. The ask is always higher than the bid, and the difference between them is called the spread. You buy at the ask and sell at the bid — so you start every trade slightly down by the spread.
What is the bid-ask spread?▾
The spread is simply ask price minus bid price. It's the market maker's compensation and your effective transaction cost. A stock quoted $10.00 bid / $10.02 ask has a $0.02 spread. Highly liquid markets (major FX pairs, large-cap stocks) have tight spreads; illiquid ones have wide spreads, which makes them more expensive to trade.
Do you buy at the bid or the ask?▾
You buy at the ask and sell at the bid. That's why a position shows a small loss the instant you open it — you've crossed the spread. To break even you need the price to move in your favour by at least the spread before commissions.
Why does the bid-ask spread matter for prop firm traders?▾
Every spread you cross is a real cost that comes straight out of your PnL, and at a prop firm your PnL is what's measured against the profit target and the drawdown limits. Scalpers who take many trades per day pay the spread repeatedly, so tight-spread instruments and low-commission firms materially change whether you pass an evaluation.
What is a bid and ask price on stocks?▾
On stocks the bid and ask come from the order book — the bid is the best price among all buy orders, the ask is the best price among all sell orders. They update continuously as orders arrive. The 'last price' you see on a ticker is the price of the most recent trade, which sits somewhere between (or at) the current bid and ask.
Trade where the spread doesn't eat you alive
Compare prop firms on real trading conditions — spreads, commissions and payout splits — not just marketing.
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