How to Trade Index CFDs: NAS100, US30 & S&P 500 Explained

Last updated: August 2026

Quick answer: An index CFD tracks the price of a stock index — the Nasdaq 100 (NAS100), the Dow Jones Industrial Average (US30) or the S&P 500 — without you owning the underlying shares. You buy if you expect it to rise, sell if you expect it to fall, post margin rather than the full contract value, and settle the price difference. The three behave differently because each weights a different set of companies by a different rule.

Index trading gives you exposure to a whole segment of the US stock market in one ticket — a view on direction rather than on which company outperforms.

What’s Included in This Article

This guide covers what an index CFD is, what NAS100, US30 and the S&P 500 track, what drives their prices, how to place a trade, the specifications and costs at FXPrimus, and how to size positions.

What Is an Index CFD?

An index CFD mirrors the value of a stock index. No shares change hands: you exchange the price difference between opening and closing the contract, and margin covers a fraction of its value.

• Two-way trading. Sell positions open as easily as buy positions, so falling markets are tradable.
• Margin and a leverage ratio. A 1% margin requirement equals a leverage ratio of 1:100, and profit or loss is calculated on the full contract value.
• Cash-settled. No shares, no dividends received directly, no voting rights.

All three are available as index CFDs at FXPrimus on MT4, MT5 and WebTrader.

NAS100, US30 and S&P 500: What Each Index Tracks

These benchmarks are not interchangeable: they differ in how many companies they hold, which sectors dominate, and how weights are calculated.

NAS100 tracks the 100 largest non-financial Nasdaq-listed companies under modified market-cap weighting, rebalanced quarterly with an annual reconstitution, per the Nasdaq-100 documentation. Technology dominates, so it reacts sharply to rate expectations.

US30 is price-weighted with no scheduled reconstitution — constituents change as needed, per the Dow Jones Averages methodology. A $400 stock outweighs a $40 stock regardless of company size, which is why the Dow diverges from the other two.

The S&P 500 covers 500 leading companies and roughly 80% of available US market capitalisation, float-adjusted, according to S&P Dow Jones Indices.

What Moves Index Prices

Index prices respond to conditions affecting many companies at once rather than single-stock news.

• Central bank policy. Rate decisions reprice future earnings, and growth-heavy benchmarks react more than the Dow.
• Economic releases. US CPI, non-farm payrolls, PMIs and GDP revisions move all three within seconds. Track them on the economic calendar.
• Earnings season. A few megacaps carry outsized weight in NAS100 and the S&P 500, so one report can shift the whole index.
• Sector rotation and sentiment. A semiconductor rally lifts NAS100 far more than the Dow; a move into banks does the reverse. Risk-off episodes usually hit technology-heavy benchmarks hardest.

How to Trade Indices Step by Step

• Pick the index that matches your view. US technology? NAS100. Broad large-cap exposure? S&P 500. Cyclical tilt? US30.
• Choose a timeframe. Intraday traders use 5-minute to 1-hour charts around the US cash session; swing traders use 4-hour and daily charts.
• Define entry, stop and target before clicking. Support and resistance zones, moving averages and prior session extremes are the standard references.
• Size the position from the stop distance, not from the margin requirement, and check the contract specification — contract size, margin rate and hours differ by symbol.

Running the sequence on a demo account first is the cheapest way to confirm your sizing.

Index CFD Specifications and Costs at FXPrimus

Costs come from the spread plus, on commission-based accounts, a per-lot fee. As of August 2026, per the live platform, the FXPrimus indices table lists these indicative average spreads:

Spreads are quoted in platform points. These symbols are priced to two decimals, so a listed spread of 180 equals 1.80 index points, and contract size 10 makes a one-point move worth 10 units of the quote currency per lot.

With the S&P 500 at 5,000, one lot is 5,000 × 10 = $50,000 of notional exposure and 1% margin is $500. Maximum leverage ratios differ by account type — see the fees and leverage page. Spreads are indicative, floating, and widen around news.

Risk Management for Index Traders

Position size is the control that matters most, because these contracts pair large notional values with fast movement. Decide the cash amount you are willing to lose, then divide it by the stop distance to get the lot size.

• Set stops from volatility, not convenience. A 20-point stop on NAS100 is noise; the same distance on the S&P 500 is meaningful. Average true range gives a defensible reference.
• Respect the calendar. Holding a position at a 1:100 leverage ratio through a CPI print without a stop is a decision, not an accident.
• Treat correlation as one position. Long NAS100 and long S&P 500 is largely the same trade twice — the largest technology names sit in both.

The FXPrimus Beginner’s Academy covers margin, point value and stop placement.

Frequently Asked Questions

What does NAS100 stand for?

NAS100 is a broker ticker for a CFD tracking the Nasdaq 100, which measures the 100 largest non-financial Nasdaq-listed companies. Other brokers label it US100 or NDX100; at FXPrimus it is .ND.

Is NAS100 the same as US30?

No. NAS100 tracks 100 non-financial Nasdaq companies by modified market cap; US30 tracks the 30 price-weighted Dow constituents. They often move in the same direction at very different speeds.

Can I short index CFDs?

Yes. A sell position profits if the index falls and loses if it rises. No share borrowing is involved, which is one reason traders use CFDs for downside exposure.

How much money do I need to trade indices?

It depends on the index level, contract size and margin rate, not a fixed minimum. At 1% margin, one S&P 500 lot at 5,000 needs roughly $500 — hold more to absorb adverse moves.

Which index suits beginners?

Judged on volatility, the S&P 500 is usually the gentler start: it is broadest and typically ranges less per session than NAS100. Test any of them on demo first.

When can I trade index CFDs?

They trade most of the day on weekdays with a scheduled break, and liquidity concentrates in the US cash session. Hours vary by symbol — confirm them in the contract specification.

Do index CFDs pay dividends?

You receive no dividends directly, since you hold no shares. Prices may be adjusted for constituent dividends, and swap charges may apply overnight.

Conclusion

Index CFDs turn a macro view into one tradable position, and the three US benchmarks give three versions of it: concentrated technology in NAS100, a narrow price-weighted sample in US30, broad large-cap exposure in the S&P 500. The mechanics are identical — the work is picking the benchmark that fits your thesis and sizing the trade so a normal adverse move is survivable.

Key Takeaways

• Index CFDs track a stock index without share ownership, trade both ways, and open on margin.
• NAS100 is technology-concentrated and most volatile; US30 is price-weighted and narrow; the S&P 500 is the broadest US benchmark.
• Weighting method explains most of the divergence between the three on any given day.
• Rate expectations, US data, megacap earnings and risk sentiment are the main drivers.
• A 1% margin rate equals a 1:100 leverage ratio; size trades from stop distance, not margin.

Ready to trade the US indices? Compare contract specifications, spreads and account types on the FXPrimus indices page, or test your strategy on demo first.

Risk warning: Trading forex and CFDs involves a significant risk of loss and is not suitable for all investors. CFDs are complex products traded on margin, and high leverage ratios such as 1:100 or above can amplify both gains and losses. Spreads, commissions and margin rates referenced are indicative, self-reported by FXPrimus, checked as of August 2026 per the live platform, and subject to change. Past performance does not guarantee future results. This article is provided for informational and educational purposes only and does not constitute financial advice, legal advice or tax advice. Review the full terms and conditions on the FXPrimus website before opening an account.