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

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 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.

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.

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.

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.

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.

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.

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 '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.

The Wall Street Journal: a timeline

The Wall Street Journal got its start as a financial news bulletin for people trading stocks. Since then, it has evolved beyond just financial news. It now ranks among the preeminent global business news sources.

Scroll through a Sears historical timeline, starting in the year 1886

The Sears story starts with railroad worker Richard Sears purchasing a declined shipment of watches for a discounted price. An interactive historical timeline chronicles the history of Sears from then onwards.

See a timeline of American Express' history

Since its founding in 1850, American Express has evolved from a mail delivery service to a multinational financial services company. Small additions to the company over time, such as taking money orders and inventing traveler's cheques, were key drivers of the company's transformation.

Dozens of S&P 500 stocks, including Coca-Cola and Walmart—known as the dividend aristocrats—have increased dividends every year for 25 years

The Fair, Isaac and Company (FICO) was founded in 1956

When they created FICO, William Fair, an engineer, and his cofounder, Earl Isaac, reasoned that financial data could help a wide variety of companies improve business decisions. FICO created the first credit scoring system to help lenders be more objective.

Airbnb’s S-1 in 2020 revealed how it weathered the pandemic and its financials

An S-1 or prospectus is a registration form filed with the US Securities and Exchange Commission when a company wants to go public. They can be pretty juicy documents, as S-1s can reveal previously private details about companies to the public, often for the first time.

Why the SEC was started

The Securities and Exchange Commission was created during the Great Depression to restore public trust in financial markets after the 1929 crash. Established in 1934, it enforces transparency, investigates fraud, and protects investors by requiring companies to disclose accurate information and holding violators accountable.

Henry Varnum Poor published a guide to the railroad industry in 1860

Poor's guide to the railroad industry helped investors evaluate changes and business decisions that might impact their investments. It was the first step in building the thorough datasets tracking companies and industries that Standard & Poor's is known for today.

The history of Reddit, the front page of the internet

The hyperactive online forum and social media platform has transformed since 2006 from a simple link-sharing site to a behemoth in digital media. Topping off its ascendancy, Reddit went public on the New York Stock Exchange in 2024, solidifying its future amid a shifting technological climate. Dive into Reddit's nearly two decades of growth with this detailed timeline.

Read about when Nasdaq partnered with the London Stock Exchange in 1992, and other key moments in Nasdaq history

The partnership became the first intercontinental linkage between capital markets, setting the stage for worldwide trading amid increasing globalization. Nasdaq separated from its parent company in 2006, becoming a fully independent licensed national securities exchange. A year later, it added the Scandinavian-based Exchange, OMX.

While the first exchange-traded fund (a 'basket' of different assets that can be bought and sold on a stock exchange) in the US only launched in 1993, the global ETF market has grown to more than $10T in the short time since.

How Standard Oil created Chevron and ExxonMobil

Standard Oil was eventually ordered to separate into 34 different entities, and over the following years, those 34 companies merged into what is now called the “Big Four” in the oil industry.

Watch a comprehensive history of the Super Bowl

This video traces the Super Bowl's history from its origins through major games, ads, and cultural moments, offering a comprehensive overview of how the event evolved. Note that the video covers through the 2020 season.

SpaceX's S-1 or 'prospectus' revealed many previously unknown details about the company, including its unprofitability despite doing $18.7B in revenue in 2025, exactly how many voting shares Elon Musk will have in the company (roughly 85%), and more.

The Planetary Society provides an active role in advancing space exploration

Founded in 1980 by Carl Sagan, Louis Friedman, and Bruce Murray in response to public interest in space not adequately reflected in government investment, it is now the world’s largest nonprofit space organization, with more than 2 million members.

The story behind the formation of the original PGA

The early 1900s saw a surge in golf courses across America, and there was a need for a national organization of golf professionals to help promote and grow the sport. This history explores how department store heir Rodman Wanamaker organized a luncheon that led to the formation of the PGA of America.

SNL's history in 60 seconds

Saturday Night Live has been a fixture of American comedy since 1975. Created by Lorne Michaels and Dick Ebersol, the show was designed as an alternative to late-night reruns, blending live sketch comedy, political satire, and celebrity impressions.

An initial public offering or 'IPO' is the process of a private company becoming public by putting shares of the company on the stock market for purchase.

A century of Billboard issues documenting the evolution of popular music.

The Nasdaq's 'Magnificent 7' companies are responsible for roughly 40% of the Nasdaq 100 index's gains, while the remaining 93 companies account for the other 60%.

Hear about the 250-year history of the United States Postal Service, complete with some of its strangest deliveries, important innovations, and the figures that made it an American institution.

The name 'Silicon Valley' arose from the founding of Shockley Semiconductor Laboratory in Fairchild Semiconductor in 1956-57, founded near Stanford University in Palo Alto

Sears sold DIY house kits starting at $600 in its famous catalog from 1908 through the 1940s, resulting in roughly 10,000 'Sears and Roebuck houses' being built.

Warren Buffett's former professor Benjamin Graham is known as the 'father of value investing,' a strategy in which investors seek to buy stocks trading below their intrinsic worth.

Explore an interactive map built from more than 100,000 survey responses on where people find joy in their lives

The power and influence of the American presidency have expanded significantly over time—far beyond what the founders envisioned.

The first steps to rebuilding your credit score include getting to know exactly what's on your credit report and figuring out how far you are from the '700 club,' or 'good score' range.

'Shogun,' a 1980s TV series, helped popularize sushi in the US by stimulating an American interest in Japanese culture.

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

Learn more about the history of fireworks, which dates back to an accidental invention during an alchemist's quest for information about immortality.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

Sony set the standard for cylinder-shaped batteries when it repurposed manufacturing equipment used to make rolls of magnetic recording tape.

How Amazon operates a 'flywheel' business model, a self-reinforcing cycle that drives continuous growth

Meet the 56 signers of the Declaration of Independence—most of whom didn't put pen to paper until August 2, 1776—and see their original signatures.

The most expensive ad of all time was for Chanel No. 5 perfume and cost roughly $33M to produce in 2004—about $57M in today's dollars.

Stars appear to twinkle because turbulence in the motion of molecules in Earth's atmosphere causes light to bend and wiggle rapidly on its way to the surface—a phenomenon called scintillation.

The Brothers Grimm were lawyers before they were storytellers, and became interested in fairy tales as they began investigating how rules and customs had been passed down through cultures.

See how Ebola tore through Guinea, Sierra Leone, and Liberia in 2014-2016.

Telehealth demand for GLP-1s for weight loss is booming as consumers seek easier access.