Bid-Offer Spread: Terms Traders Need to Know - Bid Price and Ask Price

When it comes to investing in the stock market, many people often overlook the key point of understanding the relationship between Bid (buying price) and Offer (selling price). These are not just numbers on the screen but signals indicating supply and demand in the market at each moment.

Bid ( is the buyer’s price )

Simply put, Bid is the maximum amount a buyer is willing to pay. Whenever you see the Bid curve rising on your screen, it indicates strong buying power below. The higher the Bid, the more buyers there are and the more willing they are to pay.

For example, if you want to sell shares, you will receive money based on the current Bid price. Here, we call the Bid the “seller’s price” because sellers decide whether to sell or not based on the Bid level.

Offer ( is the seller’s price )

Conversely, Offer is the lowest amount a seller is willing to accept. When you want to buy a stock, you pay the current Offer price. The Offer price is usually higher than the Bid, and the difference is called the Spread (spread).

Sellers quote the Offer based on their hope to profit from the asset. Buyers, on the other hand, expect to buy at a lower price than the seller’s initial structure.

Example of Bid-Offer functioning in real events

Imagine that Somsak (retail investor) wants to buy shares of Security A, referencing the current price of $173. But when buying 10 shares, he’s surprised to pay actually $1,731 ($173.10 per share) instead of $1,730.

What happens is the $173 price he sees is the Bid (the last traded price), but the current Offer price is $173.10. The difference of $0.10 is the Spread, which protects brokers or market makers.

The neat difference between Bid and Offer

When does the Bid-Offer Spread narrow or widen

Narrow Spread occurs when there are many trades in the market, indicating high liquidity. The difference between Bid and Offer is small, allowing buyers and sellers to transact at similar prices.

Wide Spread occurs when trading is sparse, indicating low liquidity. For example, small-cap stocks or certain bonds may require paying a premium.

Bid-Offer signals traders should watch

1. Narrow Bid, Narrow Offer

• Indicates an emerging trend but with insufficient volume
• If continuous buying appears, keep monitoring
• As volume increases, the price tends to move further

2. Narrow Bid, Wide Offer

• Signals institutional investors are preparing
• Good timing for buyers to enter positions
• Offer prices will keep rising

3. Wide Bid, Narrow Offer

• Occurs at the end of a trend
• If buying comes in with this Bid-Offer pattern, consider passing
• Price movement will slow down

4. Wide Bid, Wide Offer

• Peak volume period
• If at the start of a trend or breaking the Offer, prices will rise
• At the end of a trend, avoid trading

Why investors should pay attention to Bid-Offer

For Market Orders (Market Order) Some experts guarantee that the price of a Market Order will close near the current Bid-Offer Spread. Monitoring the spread helps you understand the actual price you will receive.

For Limit Orders and Stop Loss Understanding Bid-Offer helps you set reasonable entry and exit points instead of waiting indefinitely.

For liquidity awareness A narrow spread indicates good liquidity, enabling quick trades at low costs. A wide spread suggests additional costs need to be considered.

Points to be cautious about

Problems of a high Spread

• Buyers pay more than the market price, increasing transaction costs
• New investors often overlook this; when a Market Order executes, the product always buys at the Offer price higher than Bid

The importance of education Bid-Offer is not the only element to understand; investors should study other factors such as risk, market trends, and asset valuation.

Making buy/sell decisions using Bid-Offer

In a Bull Market (Bull Market)

• Buyers are willing to pay higher prices, so the Bid remains strong
• Offer prices are also high
• Increased demand and limited supply push Bid and Offer upward

In a Bear Market (Bear Market)

• Buyers offer lower prices, weakening the Bid
• Sellers are willing to sell at lower prices, reducing the Offer
• Excess supply over demand causes prices to fall

Summary: Bid-Offer is the key to smart trading

Understanding the relationship between Bid (buying price) and Offer (selling price) is not just about numbers but about reading market sentiment. Great traders often pick signals from the Bid-Offer Spread before significant price movements.

Large-cap stocks tend to have narrow Bid-Offer Spreads due to high trading volume, while small stocks or certain bonds may have wider spreads. Always check the current Bid-Offer before entering an asset, as it indicates the actual cost you will pay.

Stock market investing requires studying many factors, but understanding Bid-Offer is fundamental. This knowledge provides an edge in trading and helps achieve long-term returns effectively.