The Major Global Indices and What They Represent

The S&P 500 tells you something very specific about the US economy. The Nikkei 225 tells you something very specific about Japan. The FTSE 100 tells you something about the UK that is fundamentally different from what the DAX tells you about Germany.

Understanding the character of each major index, not just its name and country but its composition, its dominant sectors, and its sensitivity to different global forces, is what allows you to trade them intelligently rather than just watching numbers move on a screen.

What makes the S&P 500 particularly significant for global markets is that the US stock market represents roughly 45 to 50% of total global equity market capitalisation, as of 2026. Apple, Microsoft, Amazon, Alphabet, Nvidia, Meta, Tesla, all listed in the US, all in the S&P 500, all companies whose products and services affect billions of people globally.

The S&P 500 is heavily weighted toward technology. The information technology sector alone accounts for roughly 28 to 30% of the index, as of 2026. This means the index is particularly sensitive to changes in interest rates. Technology companies are valued heavily on future earnings, which get discounted more aggressively when rates rise. The 2022 sell-off in the S&P 500 was driven in large part by this sensitivity.

For traders, the S&P 500 is the most liquid, most widely analysed, and most technically clean index in the world. It moves every hour of the US trading day in response to economic data, Fed communications, corporate earnings, and global risk sentiment.

The NASDAQ 100 amplifies everything about the S&P 500''s technology sensitivity. It rises more than the S&P 500 when risk appetite is strong and technology stocks are in favour. It falls more when rates rise or risk appetite deteriorates. Its daily moves are consistently larger than the S&P 500.

For traders who want exposure to the technology sector and are comfortable with higher volatility, the NASDAQ 100 offers more movement per day than the S&P 500. But that movement cuts both ways. The NASDAQ 100 fell over 33% in 2022 compared to the S&P 500''s roughly 20% decline, as rising interest rates hit growth and technology stocks disproportionately hard.

The index is dominated by global giants, Shell, BP, HSBC, AstraZeneca, Rio Tinto, Unilever. These are companies that happen to be listed in London but operate across dozens of countries and earn revenues in US dollars, euros, Australian dollars, and every other major currency.

This global revenue composition has an important implication. When the British pound weakens, FTSE 100 companies that earn in foreign currencies see the sterling value of those earnings rise. A weaker pound is paradoxically often good for the FTSE 100. This inverse relationship between sterling and the FTSE 100 is one of the most distinctive characteristics of this index and one that trips up traders who assume a weaker currency must mean a weaker stock market.

Germany is the world''s third largest exporter. Its economy is built on manufacturing, cars, machinery, chemicals, and industrial equipment. Volkswagen, BMW, BASF, Siemens, and Mercedes-Benz are all DAX constituents. This industrial composition makes the DAX particularly sensitive to global economic growth.

The DAX is also heavily exposed to China. German manufacturers depend heavily on Chinese demand for their products. When Chinese economic data disappoints, the DAX frequently feels it before most other European indices. This makes the DAX one of the best indices to trade when you have a view on global industrial activity or Chinese economic momentum.

The logic becomes clear when you consider Japan''s economic structure. Japan''s largest companies, Toyota, Sony, Panasonic, Mitsubishi, are major exporters. A weaker yen makes Japanese goods cheaper for foreign buyers and increases the yen value of overseas revenues when repatriated. Both effects boost corporate earnings and therefore share prices.

A dovish Bank of Japan, keeping rates low and therefore keeping the yen weak, is generally bullish for Japanese equities. Any sign that the BOJ might raise rates and strengthen the yen tends to be bearish for the Nikkei, even though rising rates might seem like a sign of economic health.