The Dow Jones Industrial Average is a stock market index

The Dow now tracks 30 major US companies across various industries

Since 1928, the DJIA has included 30 firms. Today's group spans technology, healthcare, and finance—with Apple, Microsoft, JPMorgan Chase, Pfizer, and Coca-Cola among its most recognized components.

The Dow Jones Industrial Average was created in 1896

Charles Dow introduced the DJIA on May 26, 1896, as a simple average of 12 industrial stocks. Although it became the nation’s most enduring market index, none of its original companies remain in the Dow today.

The Dow remains a shorthand for America’s economic health

For over a century, the Dow Jones Industrial Average has been one of the most closely watched market barometers. Its rises and falls dominate headlines and politics, shaping how Americans perceive the strength of their economy.

A stock index is a group of companies clustered together, often providing a condensed snapshot of a market segment.

The Dow Jones Industrial Average vs. the S&P 500: Which one is a better representation of the economy?

The Dow and S&P 500 are both indexes meant to provide a broad representation of the economy. The Dow has 30 companies and is weighted by share price, while the S&P 500 has 500 different companies weighted by market capitalization. Since the indexes are so different, investors don't always agree on which index is a better representation of the economy—though the two move in the same direction more than 90% of the time.

The S&P 500, managed by the same company, is another major stock index

Also run by S&P Dow Jones Indices, the S&P 500 tracks 500 large US firms using market-value weighting. Many analysts view it as a more accurate gauge of the American economy.

The Dow’s price-weighted formula makes stock price matter more than size

Unlike most indices, which weigh companies by market value, the DJIA is price-weighted—meaning higher-priced stocks have more influence on its movements. As a result, a company’s share price matters more than its overall size.

See every company in and out of the Dow since 1928

The index has had 30 companies since 1928. See each company’s tenure on the index and what firms were added or replaced by year and industry.

Critics argue the Dow no longer reflects the modern economy

With only 30 companies and a price-weighted formula, skeptics say the DJIA underrepresents vast sectors of the market. They claim it is outdated, though its close correlation with the broader S&P 500 keeps it relevant.

The Dow Divisor keeps the index consistent through time

To adjust for stock splits, mergers, and replacements, the DJIA uses a figure called the Dow Divisor. Originally valued around 12 in 1896, and now less than one, it ensures today’s index levels remain comparable with the past.

Dow components are chosen by a committee, not a formula

Unlike many indices, the Dow has no strict rules for inclusion. A small committee at S&P Dow Jones Indices uses judgment—favoring companies with strong reputations, steady growth, and broad investor interest.

Even iconic companies can get dropped from the Dow

The Dow’s lineup evolves as the economy changes. General Electric, part of the original 1896 index, was removed in 2018, after 122 years. ExxonMobil, once the world’s largest company, was replaced by Salesforce in 2020.

The Nasdaq 100 index tracks the exchange's 100 largest non-financial companies

This index was created in 1985, over a decade after the Nasdaq first launched. The companies on the index must meet certain criteria, including having a minimum average daily trading value of $5M.

Investors rely on the S&P 500 as a benchmark for the state of the economy

Since the index represents a broad range of diverse industries, it's become a proxy for the market itself and a common benchmark for investors to compare returns and performance patterns against. Generally speaking, when someone says a stock is under- or out-performing the market, that actually means under- or out-performing the S&P 500. The S&P 500 is exchange-agnostic, and includes companies listed on both the NYSE and Nasdaq.

The Nasdaq Composite index includes all of the companies traded on the exchange

This 3,000+ company index stands in contrast to the Nasdaq 100, which only includes 100 of the most influential non-financial companies traded on the exchange. These are the two most commonly used indices for Nasdaq investments.

The Dow Jones & Company began as a small news service in 1882

Founded in 1882 by Charles Dow, Edward Jones and Charles Bergstresser, Dow Jones & Company started with hand-delivered market bulletins. Today it’s a global financial news giant, best known for publishing The Wall Street Journal.

Index funds are typically structured as either mutual funds or exchange-traded funds, but investors can manually recreate an index through 'direct indexing.'

In 1999, Microsoft and Intel’s addition signaled the information tech era for the Dow

Microsoft and Intel became the first information technology firms added to the DJIA. Their inclusion marked a turning point—the digital revolution and tech began to drive the American economy.

GE’s removal marked the end of an era for the Dow

General Electric, the last surviving original Dow component, was dropped in 2018, after years of decline. Its exit symbolized the fading dominance of industrial giants and the index’s shift toward technology and healthcare.

Relive the biggest swings in the Dow’s history

From the 1929 crash to the Coronavirus Pandemic in 2020, this piece spotlights five of the most dramatic single-day moves in the Dow’s 125-year history.

Dow Theory laid the groundwork for modern market analysis

Developed by Charles Dow in the late 19th century, Dow Theory argued that markets move in trends. Its principles—confirmation, trends and volume—still influence technical analysis today.

A 'large-cap' company has a market capitalization of more than $10B

The S&P 500 is primarily composed of large-cap companies. The idea is that the index provides a big-picture view of the economy by assessing the performance of many of the largest public companies across different industries. The median market capitalization of companies listed on the S&P 500 is around $40B.

Before the S&P 500 launched in 1957, Standard and Poor's had a daily index with just 90 companies

Unlike previous indexes from S&P, the S&P 500 could be computed in real time using computer technology that tracked stock tickers across stock exchanges. This innovation is partly what led to 500 companies being listed on the index, a huge increase from the 90 companies in S&P's flagship index when the company had to do all the analysis by hand.

A stock market timeline

The stock market has come a long way since the 1600s, when the first version of a stock exchange was created in Amsterdam. Mile markers along the way include everything from the Dow Jones Industrial Average's creation in 1896 to the stock market woes during the COVID-19 pandemic in 2020.

Visualizing decades of stock market performance

Stock markets and the indexes that track their biggest companies tend to ebb and flow, with long growth periods punctuated by shorter recessions. Track the 60-year history of one of the most common stock market indexes, the S&P 500, with this data visualization. The chart highlights the long-term durability of markets despite appearance of short-term volatility.

Watch how the S&P 500 is actually calculated

After accounting for each company's float-adjusted market capitalization (a metric that combines the price of a company's stock, the total number of shares, and the stock's float, which means how many shares are actually available), the S&P 500 formula uses a divisor to create the index number. However, what the divisor is and what it represents are secrets.

Why some say the S&P 500 has effectively become an AI fund

The S&P 500 is a market-cap-weighted index, which means companies with larger market capitalizations have a larger impact on the index's overall performance. Many of the top companies in the index are currently tech companies—including Nvidia, Microsoft, Alphabet, and Apple—that all have large investments in artificial intelligence. As a result, some analysts are concerned that the index is overly exposed to risky AI investments.

In late 2025, the top 10 companies in the S&P 500 made up more than 40% of the index's total value

This raised concerns for investors about the index's risk exposure. As many large tech companies continued posting record highs, analysts argued that the top-heavy index was becoming less representative of the economy as a whole.

Some argue that the S&P 500 is actually an actively managed index

Some critics of the S&P 500's selection process argue that human involvement makes it an actively managed index. S&P Global maintains that while a human selects the stocks in the index, those decisions are not made with the intent of maximizing performance, but rather, to provide a snapshot of the largest companies across different industries.

'The stock market' can be loosely defined as a set of exchanges and other places where shares of public companies are bought and sold.

The Nasdaq's 'Magnificent 7' have an outsized impact on the Nasdaq 100's performance

These seven companies are Alphabet, Amazon, Apple, Meta, Microsoft, Nvidia, and Tesla. They're often responsible for over 40% of the Nasdaq 100 index's gains, but the exact percentage varies from year to year.

See how the S&P 500 performed throughout the first 100 days of each modern presidency.

The 'Big Three' asset managers—Vanguard, State Street, and BlackRock—collectively manage more than $30T in assets and are the largest shareholders in roughly 88% of all the companies listed on the S&P 500.

The S&P 500 yields a roughly 10.5% average annual return

Tthe factors that go into that calculation are multifaceted—from how inflation impacts it to the stocks themselves. During periods of high inflation, stock performance can be stunted by investor concerns, for instance. The average return also varies based on whether dividends are included.

Retail investing by the numbers

When average Americans began pouring into the stock market, Wall Street wasn’t sure if its new guests were there to stay. But at the end of 2023, Public confidently declared that retail investors “weren’t going anywhere” after 30 million new individuals began buying and selling stock. Download the report to learn more here.

Explore a list of the world's largest mutual funds.

Why does the stock market matter?

Open any newspaper, turn on your local TV news station, or listen to a daily business radio segment, and you’re bound to hear about how the stock market is performing. Netflix created a 17-minute (free) explainer that dives deep into the nitty-gritty of how we got here.

The stock market has crashed many times throughout history

Have you ever wondered how long it takes the market to recover after a crash? This chart outlines major stock market dips throughout history and tracks how many days it took for the market to recover.

Read about the evolution of the S&P 500 and its recession recovery

Since the S&P 500 is considered a bellwether index (meaning it represents the health of the US economy), its value is important for investors in both bull and bear markets. The S&P 500 has been impacted by recessions and downturns, from the 1970s oil crisis to the dot-com crash of the early 2000s.

S&P Global, the company that makes the S&P 500, is listed on the S&P 500

When the S&P 500 index was released in 1957, it was helpful for investors, but not necessarily profitable. S&P Global now makes more than $1B a year just from selling its index data. Alongside its other services, like credit ratings, S&P Global makes more than $14B a year.

Explore 'The Big Mac Index,' an economic indicator created by The Economist as a cheeky reference for the purchasing power of consumers across different countries.

The stock market, explained in 3 minutes

The stock market consists of a set of exchanges and other venues where shares of public companies are bought and sold. The Nasdaq and the New York Stock Exchange are two of the most well-known exchanges in the US, while major exchanges also operate around the world, including in Tokyo, Shanghai, London, and São Paulo.

Check the current Consumer Price Index

The Consumer Price Index is a metric that attempts to capture price changes felt by consumers by averaging a basket of about 80,000 items, each weighted to reflect the impact of changes on households.

Explore a breakdown of the US gross domestic product, including GDP's growth over time, the GDP of individual states, and which industries contribute the most to US GDP.

The S&P 500 is composed of 500 companies, but has more than 500 total listings

Since some large companies have dual-class stock structures (like Alphabet and Fox Corporation), there are multiple listings on the S&P 500 for the same company. S&P Global has banned and then reversed bans on companies with dual-class structures multiple times since first allowing dual-class stocks in 2014.

See the top 100 ETFs by trading volume

This list grabs the top 100 by trading volume, or the average number of shares that have traded hands over a 3-month period. Top of the list is a semiconductor-focused fund from Direxion, followed by other tech-centric offerings.

The Nasdaq is typically the world's second-largest stock exchange when measured by the total market value of the companies listed on the exchange.

Track how American tariffs have impacted different countries and industries.

The number of publicly traded companies has decreased in recent years.

In 1996, more than 7,300 companies traded publicly on US stock markets, but that number has recently dropped to 4,300. Economists point to two reasons: First, going public requires full disclosure of operations, exposing it to scrutiny from investors, competitors, and analysts. Second, the IPO process is expensive and time-consuming.

Vanguard Group founder Jack Bogle created the first index fund, the Vanguard 500, in 1976—but the fund didn't take off until the 1990s.