Learning how to trade indices in the UK starts with four questions: what an index is, which product you use to trade it, when it moves in UK time and what you do at the chart. We answer each, then show the leverage risk in pounds.
Quick answer: how do you trade indices in the UK?
Most UK retail traders use a spread bet or CFD on an index such as the FTSE 100, US500, US100 or Germany 40. Pick one index, learn its session in UK time and its main drivers, mark key levels, wait for a clear price reaction and size each trade from your stop, remembering leverage magnifies losses.
What an index is and the four UK traders meet most
A stock index is a single number that tracks the prices of a basket of shares. The big ones are weighted by market capitalisation, so the largest companies move the index most. You cannot buy the index itself; you trade a product that follows it.
Providers often rename them: the UK 100 is the FTSE 100, the US Tech 100 is the Nasdaq 100 and the Germany 40 is the DAX.
| Index | Common provider name | What it tracks |
|---|---|---|
| FTSE 100 | UK 100 | 100 large London-listed companies |
| S&P 500 | US500 | 500 large US companies |
| Nasdaq 100 | US100 or US Tech 100 | 100 large non-financial Nasdaq firms |
| DAX | Germany 40 | 40 large German companies |
Each has its own character. The FTSE 100 holds many global miners, oil producers and banks, while the Nasdaq 100 leans heavily on technology, which is why it often moves further in a day. Our Nasdaq 100 price action guide looks at that index in detail.
How UK retail traders access indices: spread bets and CFDs
Most UK retail index trading is done through a spread bet or a contract for difference (CFD). A spread bet is staked in pounds per point; a CFD is traded in contracts. Both let you go long or short without owning any shares. Our guide to what spread betting is covers the basics.
Both products are leveraged, which means a small deposit, called margin, controls a much larger exposure. Under the rules ESMA adopted for retail CFDs in 2018, leverage on major indices is capped at 20:1, or 5% margin, and the FCA made equivalent limits permanent in the UK in 2019. Gains and losses are calculated on the full exposure, so a modest move against you can cost far more than you expected.
The same rules added margin close-out at 50% of required margin and negative balance protection, so a retail account should not go below zero. Our guide to margin and leverage explained for UK beginners covers the mechanics.
Spread bet or CFD?
For a UK beginner the difference is mostly stake format and tax. Spread betting profits are generally free of Capital Gains Tax, but treatment depends on your circumstances, so it is never a reason to trade.
Index trading hours in UK time
Each index has a cash session, when its shares trade, and a much longer quote from your provider, usually priced from futures.
| Index | Cash session (UK time) | Busiest window |
|---|---|---|
| FTSE 100 | 08:00 to 16:30 | 08:00 to 10:00 |
| Germany 40 | 08:00 to 16:30 | 08:00 to 10:00 |
| US500 | 14:30 to 21:00 | 14:30 to 16:00 |
| US100 | 14:30 to 21:00 | 14:30 to 16:00 |
The London times come from the London Stock Exchange’s trading hours for its Main Market. Frankfurt’s 09:00 to 17:30 session lines up with the same UK hours because Germany and the UK change clocks on the same dates.
The March 2027 clock gap
US clocks go forward on 14 March 2027 and UK clocks on 28 March. Between those dates the US cash open is at 13:30 UK, an hour earlier than usual. Our guide to trading the US500 with price action sets out the full US session.
What moves indices
Indices respond to anything that changes expected profits or the cost of money. We watch:
- Interest rate decisions: Bank of England, ECB and Federal Reserve announcements.
- Inflation and jobs data: US releases at 13:30 UK often move all four indices.
- Earnings from the largest companies: a few heavyweights can drag a whole index.
- Currency moves: a weaker pound tends to support the FTSE 100, because many of its firms earn abroad.
- Risk appetite: on fearful days indices often fall together.
We do not open a new trade in the minutes before a major release. Our guide on when not to trade and why staying flat counts covers the other conditions where we stand aside.
A price action approach to indices
We use the same routine on every index. Price action means reading the chart itself, highs, lows and reactions at levels, rather than relying on indicator signals.
- Pick one index whose session suits your day, and stick with it while you learn.
- Set a bias on the daily chart from its swing highs and lows.
- Mark the levels: previous day’s high and low, overnight high and low, round numbers. Our guide to ranking key levels by strength shows which to trust first.
- Wait for price to reach a level in line with your bias, after the open has settled.
- Enter only on a clear reaction, such as a rejection candle, with the stop beyond the level.
- Size the trade from the stop, then accept the loss if it is hit.
Some traders add market profile to find value; our US500 market profile worked example shows that lens on one index.
Worked example: a hypothetical FTSE 100 spread bet
Example, hypothetical levels only: on a £5,000 account you risk 1% per trade, so £50. The daily chart is rising, and yesterday’s low at 8,180 sits near the round number 8,200, so 8,180 to 8,200 is your zone.
After 08:00, price dips into the zone and a 15-minute candle rejects it. You buy at 8,200 with a stop at 8,175, 25 points away, so your stake is £50 divided by 25, or £2 per point. Our guide to calculating position size for spread bets and CFDs shows the arithmetic.
Now the leverage. At £2 a point your exposure is 8,200 × £2, or £16,400, and at 20:1 the margin is about £820. If the market gapped 400 points lower overnight, roughly 5%, you could lose about £800, or 16% of the account, rather than the £50 you planned.
Common mistakes
- Trading several indices at once. They often move together, so three trades can be one large bet.
- Treating margin as risk. Your risk is the stop distance times your stake, and a gap can exceed it.
- Entering at the cash open. The first minutes often swing both ways.
- Forgetting the clock gap. In March and late October to early November, US times shift by an hour.
Frequently asked questions
Which index is best for beginners in the UK?
There is no single best one, but the FTSE 100 suits many UK beginners because its cash session runs during the UK working day. The US500 suits people who are free in the afternoon and evening.
Can you trade indices 24 hours a day?
Many providers quote major indices almost around the clock, priced from futures outside cash hours. Outside cash hours spreads are often wider, so we focus on the cash session.
How much leverage can I use on indices in the UK?
For retail clients, leverage on major indices is capped at 20:1, which means a 5% margin requirement. Providers can ask for more margin than that, but not less.
How much money do I need to start trading indices?
That depends on your provider’s minimum stake and your risk per trade. We suggest working out what a normal stop would cost at the smallest stake before funding an account, and practising on a demo first.
Next steps
If you are new to markets, start with our guide to learning to trade in the UK and where to start. Then compare the two US indices in more depth, and try the free basics section of our price action trading course, which covers assessing price position before any trade.
This article is for education only and is not financial advice. Trading leveraged products such as CFDs and spread bets carries a high risk of losing money.
