130 Years of Stock Market Indices: The Journey from 12 Stocks to Global Benchmarks
On this day 130 years ago, in May 1896, Charles Dow introduced a simple yet transformative idea: he calculated the average share price of 12 industrial companies to provide a snapshot of the stock market’s direction. At the time, markets were fragmented, information was limited, and investors lacked a clear way to answer a fundamental question—is the market going up or down?
That modest calculation became the Dow Jones Industrial Average (DJIA), the world’s first stock market index. More than a century later, indices have evolved into the backbone of global investing, shaping not only how we measure markets, but how trillions of dollars are allocated across them.
To appreciate just how far stock market indices have come, it is helpful to step back and look at the full journey.
The chart shows the evolution of the Dow Jones Industrial Average from 1896 to 2023, highlighting major market events that shaped global investing. While the chart ends in 2023, the long-term upward trajectory has continued, with the index reaching new highs in recent years.
Several themes immediately stand out. Markets have experienced severe drawdowns, from the Great Depression to the Global Financial Crisis, yet the long-term trajectory remains upward. For investors, this is perhaps the most powerful lesson embedded in more than a century of index history – volatility is inevitable, but over time, markets have rewarded patience.
The Original 12: A Window into Industrial America
The first Dow Jones index consisted of the following companies:
- American Cotton Oil
- American Sugar
- American Tobacco
- Chicago Gas
- Distilling & Cattle Feeding
- General Electric
- Laclede Gas
- National Lead
- North American
- Tennessee Coal, Iron and Railroad
- U.S. Leather (preferred)
- U.S. Rubber
These were firms at the heart of the American industrial economy – energy, commodities, manufacturing, and infrastructure. General Electric is notably the only one of the original constituents to have endured into the modern era, though even it was removed from the index in 2018 after more than a century of inclusion.
Dow’s methodology was straightforward – add up the share prices and divide by the number of companies. This price-weighted approach meant that companies with higher share prices carried greater influence, regardless of their actual economic size, a limitation that persists in the DJIA today.
From Snapshot to System: Expanding the Idea
As markets grew, so too did the need for better representation. The DJIA expanded from 12 to 20 companies in 1916, and then to 30 in 1928, where it remains today. Complementary indices like the Dow Jones Transportation Average emerged, reflecting other key sectors of the economy.
But early indices were still relatively narrow and, by modern standards, crude. They were designed to provide a sense of the market rather than a precise measurement. As investing became more sophisticated, the limitations of these early indices became increasingly apparent.
The Rise of Modern Benchmarking
A major leap forward came in 1957 with the launch of the S&P 500. Unlike the Dow, the S&P 500 used a market capitalisation-weighted methodology, meaning companies were weighted according to their total market value rather than their share price.
This innovation mattered. It aligned the index more closely with the real economy and made it a far more accurate benchmark for overall market performance. The S&P 500 quickly became the standard against which fund managers measured success.
Globally, similar indices followed:
- FTSE 100 in the UK
- Nikkei 225 in Japan
- MSCI indices, which opened the door to tracking global and emerging markets
For offshore investors, this marked a turning point. It became possible to assess performance not just within a domestic market, but across regions, sectors, and currencies.
From Measurement Tool to Investment Strategy
Indices remained primarily measurement tools until the 1970s, when a quiet revolution began. In 1976, John Bogle launched the first index fund, based on a simple but powerful idea – instead of trying to beat the market, investors could simply own it.
This was initially controversial. Active management dominated the industry, and the idea of settling for “average” returns seemed unappealing. Yet over time, the logic proved compelling:
- Lower costs
- Broad diversification
- Consistent performance relative to benchmarks
The rise of exchange-traded funds (ETFs) in the 1990s accelerated this trend, making indices not just passive benchmarks, but directly investable products.
Today, passive investing accounts for a substantial share of global equity ownership, and indices play a central role in capital allocation. Companies are bought and sold not only based on fundamentals but based on their inclusion, or exclusion, from major benchmarks.
A More Complex Landscape
Modern indices have evolved far beyond simple market tracking. Today’s investors can access:
- Factor-based indices (value, growth, momentum)
- Thematic indices (technology, clean energy, artificial intelligence)
- ESG-focused indices, reflecting environmental and social criteria
- Highly targeted regional and sector exposures
For offshore investors, this provides both opportunity and complexity. Indices now shape not just what you invest in, but how you think about diversification, risk, and currency exposure.
What began as a neutral measure of market performance has increasingly become a reflection of investment philosophy.
Why Indices Still Matter
Despite their evolution, the core purpose of indices remains unchanged – they help us make sense of markets.
They provide:
- A benchmark for performance
- A framework for portfolio construction
- Insight into market structure and sentiment
But perhaps most importantly, indices influence behaviour. They guide capital flows, affect valuations, and shape the way investors allocate assets across the globe.
Closing Thoughts
From a handwritten list of 12 companies in 1896 to the complex network of global benchmarks we have today, stock market indices have come a long way.
They have evolved from simple indicators into powerful tools that underpin modern investing.
For today’s offshore investor, understanding indices is not just about tracking performance, it is about understanding the forces that drive markets themselves.
Because in the end, indices don’t just measure the market.
They help define it.