Index trading means taking a position on the combined movement of a whole group of companies instead of on any single one. Most beginners do it through a CFD, which lets you follow an index such as the US 30 or the US 500 up or down without owning anything. This guide explains what an index is, how the price moves, what it costs, and how to practise safely.
What is a stock index, and why do people trade it?
An index is a score that summarises a market. It takes a basket of large companies, combines their values using a fixed method, and publishes one number. When that number rises, the companies in the basket were worth more overall. When it falls, they were worth less.
The appeal for beginners is spread. A move in one company can be sharp and sudden, but an index blends hundreds of businesses, so one bad announcement rarely moves it much. You are following the direction of a whole economy, not relying on a single name.
Indices are also popular because they react to big, widely discussed events such as interest rate decisions and economic reports. You can follow these on the economic calendar.
What are the US 30, US 500 and other major indices?
Each index has a nickname that matches the number of companies it tracks or the country it covers. The most common ones are:
- US 30 follows 30 large American companies and is also known as the Dow Jones
- US 500 follows 500 large American companies and is also known as the S&P 500
- US Tech 100 follows 100 of the largest technology-focused companies
- Germany 40 and UK 100 follow the biggest companies in Germany and the United Kingdom
- Japan 225 follows large Japanese companies
You can see the full range on the index markets page. Each index has its own trading hours, because it follows the opening times of the country it covers.
How does index trading work with CFDs?
A cash index CFD is a contract that follows the live price of an index. You do not own the companies inside it. You agree with your broker to exchange the difference between the price when you open the position and the price when you close it.
Because it is a "cash" contract, there is no expiry date to track and nothing to roll over. You keep the position open for as long as you want, and you pay the spread plus a small daily financing adjustment if it stays open past the rollover time.
You can go long if you expect the index to rise, or short if you expect it to fall. Either way, the result depends on the direction the price actually takes, and that can go against you just as easily as with you.
A worked example with round numbers
The figures below are made up for illustration and are not a forecast. Suppose the US 500 is at 5,000 points, and one contract is worth 1 dollar per point.
You open a long position of 1 contract at 5,000.
- If the index rises 40 points to 5,040, you gain 40 dollars
- If the index falls 40 points to 4,960, you lose 40 dollars
If you open 5 contracts instead, each point is worth 5 dollars, so the same 40-point move is worth 200 dollars either way. Position size is the lever you control, so choose it before you click, not after.
You can test the sums yourself with the profit calculator before risking anything.
What does index trading cost?
There are two costs to understand. The first is the spread, the small gap between the price you can buy at and the price you can sell at. You pay it when you open the position, so a trade starts slightly in the red.
The second is the financing adjustment on positions held past the daily rollover. It is usually small, but it adds up if you hold a position for weeks. Check both before you trade, because they affect how far the index must move before you break even.
How do leverage and margin affect an index position?
CFDs are traded on margin. You put up a fraction of the full position value and the broker covers the rest. DMA Capitals offers leverage of up to 1:500, so a small deposit can control a much larger position.
That sounds helpful, but leverage magnifies losses exactly as much as gains. Using round numbers, if you hold a position worth 10,000 dollars and the index moves 1% against you, you lose 100 dollars, even if you only put up a small part of the 10,000 as margin. Use the margin calculator to see how much margin a position needs, and keep spare funds in the account so a normal swing does not close the position for you.
Higher leverage does not make an index easier to trade. It only makes a mistake bigger.
When can you trade an index?
Indices follow their home market, so the busiest periods are when that country's exchange is open. The US indices are most active during the American session, and the Germany 40 and UK 100 during European hours.
Activity often jumps when two sessions overlap or when a major report is released. The market hours tool shows when each market is open, and the market holidays page shows days when trading is limited.
What are the risks of index trading?
An index is diversified, but that does not remove risk. A whole market can fall together, and it can do so quickly after unexpected news. A price can also jump past the level where you planned to exit, which is called a gap.
CFDs carry a high risk of losing money, mostly because of leverage. You should only use money you can afford to lose, and you should read the risk warning before you start.
What should you do next?
Open a demo account and practise with virtual money first. Pick one index, such as the US 500, and watch how it behaves through a full session. Place a few small trades, set a stop loss each time, and write down what happened.
When you can explain why you entered, where you would exit, and how much you were prepared to lose, you are better prepared to decide what to do next. You can set up a practice account by following the demo account guide.
This article is general education, not investment advice. CFDs are leveraged products and you can lose more than you expect; read our risk warning.