S&P 500 vs FTSE 100: 20 Years of Returns Compared

Over the last 20 years, the S&P 500 vs FTSE 100 contest has not been close. A $1,000 stake in the S&P 500 in May 2005, with dividends reinvested, grew to roughly $7,672 by May 2025. The same idea in London — £1,000 into the FTSE 100 — turned into about £3,440 over a comparable two decades. One index roughly doubled the other.

This post breaks down exactly why that gap opened, where the FTSE 100 quietly fights back, and what a UK or US investor should take from it. It is written for people learning to invest properly, not chasing a hot take — so if you want to build the analytical habit behind comparisons like this, our structured courses built around the US, UK and European markets are a sensible next step.

Is the S&P 500 better than the FTSE 100?

On 20-year total return, the S&P 500 has clearly beaten the FTSE 100 — roughly 10.7% a year against 6.4%. But "better" depends on what you want: the S&P 500 won on growth, while the FTSE 100 pays far higher dividends, trades much cheaper, and behaves differently in a downturn. Returns alone do not settle it.

That distinction matters because the two indices are not slightly different versions of the same thing. They own different companies, in different industries, priced on different assumptions. The performance gap is the visible result of those hidden structural choices — and once you see the structure, the numbers stop being surprising.

20 years of returns, side by side

Start with the headline that drives most searches for us vs uk stock market returns: the annualised total return, dividends reinvested, over roughly the last two decades.

Put in money terms, $1,000 in the S&P 500 became about $7,672 with dividends reinvested. Strip the dividends out and it was around $4,932 — so even the US index leaned on payouts. The FTSE 100 delivered a 244% total return over 20 years to 2026, which is the 6.4% annual figure above.

What this means for you: a four-percentage-point annual gap sounds small and compounds into roughly double the money. That is the single most important lesson in this whole comparison — small, persistent differences in annual return dwarf almost everything a beginner worries about, including which week they bought. If you want the mechanics of the US market's NYSE and NASDAQ that produced those returns, start there.

Why does the FTSE 100 lag the S&P 500?

The honest answer is composition, not country. The S&P 500 has been carried by a handful of mega-cap technology companies; the FTSE 100 simply does not own them. Compare what sits inside each index and the return gap explains itself.

Sources: DQYDJ / Of Dollars And Data and IG (returns); S&P Dow Jones Indices / MacroMicro and Siblis Research (sector weights, 2026); GuruFocus / Multpl and IG (dividend yields, 2026); The Motley Fool UK (valuations, Feb 2026); US Federal Reserve and Exchange-Rates.org (GBP/USD, 2005 and 2025).

Read that table top to bottom and the story is consistent. The S&P 500 is a bet on technology and growth; the FTSE 100 is a bet on banks, oil, miners, drugmakers and consumer brands — mature, cash-generating businesses that grow slowly and pay you to wait. Over a decade where software ate the world, the tech-heavy index was always going to win on price. For a beginner-friendly tour of how the FTSE 100 actually works, that internal walkthrough pairs well with this data.

The catch: the same concentration that powered the S&P 500's returns is now its biggest risk. When a third of an index sits in one sector, you are no longer buying "the market" — you are buying a sector bet that happens to be wearing an index's clothes.

Dividends: where the FTSE 100 fights back

Look only at price charts and the FTSE 100 looks almost stationary — it spent years stuck near old highs. But price is the wrong lens. Dividends are where the UK index earns its keep, and they are the reason its total return is so much higher than its flat-looking chart suggests.

Sources: GuruFocus / Multpl and IG (yields, 2026); City AM / Schroders, "How the FTSE 100 returned 122% in 20 years but barely moved" (dividend-reinvestment analysis).

The FTSE 100 rose about 122% on price alone over 20 years but delivered roughly 244% once dividends were reinvested. Half the return was invisible on the chart. This is the trap behind ftse 100 long term performance headlines: judging a high-yield index on price is like judging a rental property by what its windows look like, ignoring the rent.

What this means for you: always compare indices on total return, never on the level of the index. A market that pays 3.4% and grows slowly can still build serious wealth — if you reinvest. A market that pays 1% has to grow far faster just to keep up.

The currency catch for UK investors

There is a hidden variable in every cross-border comparison: the exchange rate. For a UK investor, S&P 500 returns are earned in dollars and then converted back to pounds — and over these 20 years that conversion was a gift.

In 2005 one pound bought about $1.82. By 2025 it bought roughly $1.32 — the pound fell about 27.5% against the dollar. For a sterling investor, every dollar of US gains was worth more pounds at the end than at the start, layering a currency tailwind on top of the S&P 500's already-higher returns.

That sword cuts both ways. For a US investor, the same move was a headwind on the FTSE 100: UK gains earned in a weakening pound shrank when converted to dollars. So part of the raw return gap you see in any s&p 500 vs ftse 100 total return chart is not company performance at all — it is the currency the chart is drawn in.

The catch: currency moves are not guaranteed to keep going the same way. A sterling investor who enjoyed a falling pound for 20 years is exposed if the pound recovers — their US holdings would lose value in pound terms even if the S&P 500 itself rose.

Should UK investors buy US stocks or the FTSE 100?

For most long-term investors the honest answer is not either, but both — through low-cost diversified funds. The 20-year data favours US exposure, but buying the recent winner at a rich valuation is exactly how investors get hurt. The question is really about balance, not picking a side.

Here is the case on each side, stripped of cheerleading:

And the market just reminded everyone why valuation matters. In 2025 the FTSE 100 rose around 21% and beat the S&P 500 for the first time in over a decade — its best year since 2009 — as investors rotated out of expensive US technology into cheaper, dividend-paying value and commodity sectors. One year does not rewrite a 20-year trend, but it does prove the trend is not a law of physics.

What this means for how you actually invest

The data is interesting; the behaviour it should change is the point. A few specific, non-generic conclusions a learner should take from the s&p 500 vs ftse 100 record:

• Never compare indices on price level. A flat FTSE 100 chart hid a 244% total return. Always pull the total-return number with dividends reinvested.
• Know what you actually own. Buying an S&P 500 tracker today is a ~35% bet on one sector. That is a legitimate choice — but make it knowingly, not by accident.
• Treat currency as a real position. A UK investor holding US funds is also holding a dollar position. Decide whether you want that exposure or want to hedge it.
• Do not extrapolate the last 20 years. The S&P 500's win came partly from valuations rising to ~28 P/E. Repeating that requires them to rise again — not a safe assumption.
• Diversify across both. Owning the US for growth and the UK for income and value is not a compromise; it is risk management.

If income and lower-cost markets appeal to you, it is worth understanding why ETFs have taken off with US and European investors as the simplest way to own either index in one trade — without trying to out-pick a 500-stock benchmark by hand.

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Trading and investing involve substantial risk of loss and are not suitable for every investor. Past performance does not predict future results, and nothing in this article is investment advice.