Bid and Ask Spreads in Day Trading

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Day trading markets have two separate buying and selling prices known: the bid and ask, which respectively mean buying and selling. The distance between these two prices can vary and affect whether a particular market can be traded. It also determines how trading is done. 

Small Spreads

When the bid and the ask prices are close, there is a small spread. For example, if the bid and ask prices on the YM, the Dow Jones futures market, were at 1.3000 and 1.3001 respectively, the spread would be 1 tick.

A small spread will exist when a market is being actively traded and has high volume—a significant number of contracts being traded. This is the case throughout the trading day for many popular trading markets, but it only happens at certain times of the day for other markets, such as the European open and the U.S. open.

Large Spreads

When the bid and ask prices are far apart, the spread is said to be a large spread. If the bid and ask prices on the EUR, the Euro to U.S. Dollar futures market, were at 1.3405 and 1.3410, the spread would be 5 ticks.

A large spread will exist when a market is not being actively traded and it has low volume—the number of contracts being traded is fewer. Many day trading markets that usually have small spreads will have large spreads during lunch hours or when traders are waiting for an economic news release.

Effects on Trading

Most day traders prefer small spreads because they allow their orders to be filled at the prices they want. Many day traders will temporarily stop trading if their market develops a large spread.

A large spread causes orders—especially market orders—to be filled at unwanted prices. This then requires adverse adjustments for the trading system to compensate, such as increasing a stop loss.

Trading the Spread

Some day traders make trades that try to take advantage of the spread, and these traders prefer a large spread. Trading systems that trade the spread are collectively known as "scalping" trading systems. The traders are known as scalpers because they only want a few ticks of profit with each trade. An example of trading the spread would be to place simultaneous limit—not market—orders to buy at the bid price and sell at the asking price, then wait for both orders to be filled.

Small Spread Markets

Some popular day trading markets that usually have small spreads include currency futures such as EUR, the Euro futures market, and stock index futures. Some stock index futures include: 

  • YM: The Dow Jones futures market
  • ES: The S&P 500 futures market
  • ER2: The Russell 2000 futures market
  • DAX: The DAX futures market
  • CAC40: The CAC40 futures market

ZG, the Gold 100 troy ounce futures market, is a commodity future that usually has small spreads. ZC, the corn futures market, and ZW, the wheat futures market, are examples of agricultural futures where you're likely to see small spreads.

Disclaimer: The Balance does not provide tax, investment, or financial services and advice. The information is being presented without consideration of the investment objectives, risk tolerance or financial circumstances of any specific investor and might not be suitable for all investors. Past performance is not indicative of future results. Investing involves risk including the possible loss of principal.