The S&P 500 has an average intra-year drawdown of -16%

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.

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.

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.

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 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.

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.

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

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.

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.

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.

The SPDR S&P 500 ETF is one of the most highly traded funds on the market

State Street, a popular ETF issuer, is responsible for the SPDR S&P 500 ETF. This fund trades under the SPY ticker, and State Street maintains a web page with key facts and figures on SPY. For instance, its expense ratio is 0.0945%, or $9.45 on an initial $10K investment.

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.

Listen to the methods and strategy of the secretive S&P 500 selection committee

Stocks are added to the S&P 500 by a secret selection committee that meets regularly to assess which companies can remain in the index, which companies need to be added, and which companies no longer meet the criteria. The members of the committee used to be public, but S&P Global decided to keep its members confidential after companies sent packages, letters, and gifts to try to make it into the index.

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.

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.

The S&P 500 selection committee has strict rules around adding a company to the index

While the decision to add a company to the index is ultimately up to the selection committee, any prospective company has to meet some criteria to be considered. To join, the company must have been profitable for the last four quarters, must have a market capitalization exceeding $22.7B, and meet certain requirements around tradeable stock availability (or float).

Visualize stock market's volatility between 2017 and 2025.

See a timeline of S&P Global's history—the company behind the S&P 500

From the 1941 merger of Standard Statistics and Poor's Publishing to the creation of the S&P 500 in 1957, the company that created the famous index has long been a leader in financial intelligence.

Some institutional investors are growing wary of private equity, as certain investments underperform traditional market indices

Private equity often attracts investors who can afford to tie up capital for long periods of time in exchange for higher returns than traditional investments. For many years, private equity at least tracked with the S&P 500 in terms of returns to investors, but in 2024 and 2025, it underperformed and posted declining returns.

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.

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

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.

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.

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.

S&P 500 stocks that have increased their dividends for 25 consecutive years are called 'dividend aristocrats'

Dividend aristocrats are considered the best of the best on the S&P 500—all with market capitalizations above $3B, more than $5M in daily trading volume, and consecutive dividend growth for a minimum of 25 years. Some examples of dividend aristocrats are Coca-Cola, Procter & Gamble, and Walmart.

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 how Vanguard's founder used the S&P 500 to revolutionize retail investing

John Bogle, the founder of The Vanguard Group, created a fund that tracked the S&P 500 in 1976. That fund created an unprecedented opportunity for individual retail investors, brought down fees across the board, and popularized the belief that passive, low-cost index fund investments would outperform actively managed portfolios long-term.

What a $1K investment in P&G stock 20 years ago would be worth today

If someone put $1K into P&G stock 20 years ago, it would be worth about $5.2K in 2025, making its annualized return about 8.6%. For context, the S&P 500 has had an annualized return of 10.7% over the same time period.

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.

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.

Mutual funds in seven broad categories averaged a 13.1% annual return in 2023.

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.

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.

Read about the 'gatekeeper' of the stock market, former index chair at S&P Global

David Blitzer, the former index chair at S&P Global, earned the nickname "gatekeeper" of the stock market after helping decide which companies made it into the S&P 500 for 24 years. Blitzer became a legend in the world of indexing and has a reputation for being even-tempered and always wearing a bow tie.

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

90 percent of active managers of large public funds underperform

High fees tend to eat away at whatever edge professional managers accrue, resulting in most such funds performing worse than their underlying benchmark indexes like the S&P 500.

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.

Many retail investors exited the stock market after 2008, leading to a drop in individual market participation

That changed thanks to GameStop, federal stimulus checks, and strong corporate results in the first quarter of 2021. This chart plots how much retail investors poured into the market each day, reaching records in early 2023.

In 2024, US private equity posted an 8.1% return

Tracked by Cambridge Associates, 2024 performance saw limited partner distributions overtake contributions for the first time in years. Cambridge Associates, a leader in the space, typically uses a 2.0x+ MOIC (Multiple on Invested Capital) as a benchmark for top-quartile PE fund success.

Explore a step-by-step guide for getting started as a retail investor

Instead of purchasing individual stocks and bonds, new investors may want to start in funds that track an index—like the S&P 500—or that hold a group of themed stocks.

The financial crisis in 2008 had a major impact on many 401(k) plans

Amid the 2008 financial crisis, stocks and bonds cratered as the broader market floundered due to the subprime mortgage crisis. Investors with so-called "target-date" funds—which shift allocations based on the maturation of a fund—shared in the slump, with some funds declining by 20% or more just a year or two away from maturation.

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.

An expense ratio represents the cost to own an ETF over the course of the year

For instance, an expense ratio of 0.5% would add a cost of $50 on an investment of $10K. And while expense ratios have on average decreased in recent years, a particularly hefty fee can still eat into total profits.

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.

Retail investors are average joes, while institutional investors often move billions of dollars a day

Retail investors often trade 100 shares at a time, while institutional investors trade 10,000 or more. The biggest difference is that, unlike retail investors, institutional investors are professionals who are trading someone else’s money.

An inverted yield curve has preceded every recession that’s occurred in the last 50 years

Prolonged yield curve inversions can predict recessions, but even brief inversions can cause investors to react with knee-jerk reactions.

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.

Shorting is a high-risk and expensive investment strategy that hedge funds specialize in

Most investors buy stocks with the expectation that those stocks will be worth more tomorrow than they are today. Short selling, known as “shorting,” a stock is the opposite: The investor is betting the stock will drop in value.

Private equity companies are selling off more acquisitions—but at much lower prices

In 2025, private equity exits were up by 5.4%, but the total value of those deals was down by 21.2% year-over-year. An exit occurs when a private equity firm either sells an acquired company or takes that company public.

The Dow Jones Industrial Average is a stock market index

The Dow Jones Industrial Average tracks 30 large U.S. companies from all major U.S. sectors except for utilities and transportation. It's considered a bellwether of the U.S. economy.