Bid-Ask Spread
Quick Definition
The difference between the highest price a buyer will pay (bid) and the lowest price a seller will accept (ask) for a security.
What Is Bid-Ask Spread?
The Bid-Ask Spread is the difference between the bid price (what buyers are willing to pay) and the ask price (what sellers are willing to accept). This spread represents a transaction cost for investors and a profit opportunity for market makers.
The Two Prices:
- Bid Price: The highest price a buyer is currently willing to pay
- Ask Price: The lowest price a seller is currently willing to accept
- Spread: Ask Price - Bid Price
Example:
| Stock | Bid | Ask | Spread | Spread % |
|---|---|---|---|---|
| Large-Cap (AAPL) | $150.00 | $150.02 | $0.02 | 0.01% |
| Mid-Cap | $45.00 | $45.10 | $0.10 | 0.22% |
| Small-Cap | $8.00 | $8.25 | $0.25 | 3.13% |
| Penny Stock | $0.50 | $0.60 | $0.10 | 20% |
Factors Affecting Spread:
- Liquidity: More trading volume = tighter spreads
- Volatility: Higher volatility = wider spreads
- Market Hours: Spreads widen after hours
- Stock Price: Lower-priced stocks often have wider percentage spreads
- Market Conditions: Spreads widen during market stress
Why Spreads Matter:
- Immediate cost when buying and selling
- Affects day trading profitability
- Indicates market liquidity
- Wider spreads signal higher risk
Trading Implications:
- Use limit orders in wide-spread stocks
- Avoid frequent trading in illiquid securities
- Consider spread when calculating breakeven
Related Terms
Liquidity
The ease and speed with which an asset can be converted to cash without significantly affecting its market price.
Market Order
An order to buy or sell a security immediately at the best available current price.
Limit Order
An order to buy or sell a security at a specific price or better, giving you price control but no execution guarantee.
Market Maker
A firm or individual that continuously quotes both buy and sell prices for a security, providing liquidity to the market.
Stock
A security representing ownership in a corporation, entitling the holder to a share of profits and voting rights.
Initial Public Offering (IPO)
The first sale of a company's stock to the public, transitioning it from private to publicly traded.
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