What Is the S&P 500?
If you want to understand the health of the US economy briefly, there is one number most financial professionals look to first — and that number belongs to the S&P 500.
The S&P 500 — formally known as the Standard and Poor’s 500 — is a market capitalisation-weighted index that tracks the performance of the top 500 publicly listed companies in the United States. Covering sectors from technology and healthcare to energy and consumer goods, it represents approximately 80% of all US stock market capitalisation — the single most comprehensive barometer of American corporate performance available.
When investors, analysts, and financial media refer to “the market,” they are almost always referring to the S&P 500.
How Does the S&P 500 Work?
The S&P 500 is market capitalisation-weighted, meaning larger companies have proportionally greater influence on the index’s overall level. A significant price move in Apple, Microsoft, or Amazon impacts the index far more than an equivalent move in a smaller constituent.
The index is maintained by S&P Dow Jones Indices and reviewed quarterly, adding companies that meet eligibility criteria and removing those that no longer qualify. To be included, a company must be US-listed, carry a market capitalisation above a set threshold, demonstrate positive earnings, and meet minimum liquidity standards.
Why Does the S&P 500 Matter to Traders?
A Gauge of Global Market Sentiment
Because the US economy is the world’s largest, S&P 500 movements have ripple effects across every major market globally. A sharp selloff typically signals risk-off conditions that affect forex, commodities, and international equities simultaneously.
Diversified Market Exposure in One Instrument
Trading the S&P 500 gives you broad exposure to US corporate performance across every major sector — in a single, highly liquid position, without analysing hundreds of individual stocks.
The Universal Performance Benchmark
Institutional and retail investors worldwide use the S&P 500 as the standard benchmark against which all investment performance is measured. Consistently outperforming it is considered the defining test of active fund management.
How to Invest in the S&P 500 in the UK
For UK-based traders and investors, there are several accessible routes:
- Index CFDs — Trading the S&P 500 as a CFD on platforms like VT Markets allows you to go long or short with leverage, without owning the underlying shares — the most flexible method for active traders
- ETFs — S&P 500-tracking exchange-traded funds such as the iShares Core S&P 500 UCITS ETF are listed on the London Stock Exchange and accessible through most UK investment platforms
- Index funds — Low-cost passive funds replicating S&P 500 performance are available through ISAs and SIPPs — a popular choice for long-term UK investors seeking US exposure with minimal fees
The More You Know, The Sharper You Trade
The S&P 500 is more than a number — it is the world’s most important financial benchmark and one of the most versatile instruments available to UK traders and investors at every level.
Explore the full VT Markets Trading Glossary and build the market knowledge that keeps every trading and investment decision sharper and better informed.
Risk Warning: Trading CFDs involves significant risk and may not be suitable for all investors. Losses can exceed your initial deposit. Please ensure you fully understand the risks involved before trading.
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