The US stock market is the world’s largest financial market, where investors buy and sell shares in publicly listed American companies. When you purchase a share, you own a small portion of that company and may benefit from its growth through capital appreciation (rising share prices) and dividends.
Publicly listed US companies are primarily traded on two major exchanges: the New York Stock Exchange (NYSE) and the Nasdaq Stock Market (NASDAQ). The NYSE, located in New York City, is the world’s largest stock exchange and is often associated with established, blue-chip companies. Nasdaq is an electronic exchange known for its strong representation of technology and growth-oriented companies.
Because the US market includes many of the world’s largest and most influential corporations, it is widely used by investors seeking long-term growth, liquidity, and diversification.
Below you can learn about the Major US Stock Market Indices. Stock market indices measure the performance of a group of companies and act as benchmarks for the overall market. When you hear “the market was up today,” it usually refers to one of the major US indices. Below are the most important US Stock Market Indices for beginner investors.
The S&P 500 is an index tracking 500 of the largest US companies. It is market-capitalisation weighted and widely considered the best overall measure of the US share market. Here are the top 10 companies in the S&P 500 by market capitalisation (approximate ranking based on current market values as of 17 Feb 2026 in the US market): Apple, Microsoft, Amazon, NVIDIA, Alphabet, Meta Platforms, Berkshire Hathaway, Tesla, UnitedHealth Group, Johnson & Johnson.
The DJIA is a US stock market index that tracks 30 large, well-established American companies. Created in 1896, it is one of the oldest and most widely followed indicators of the US share market’s performance. Unlike most modern indices, the Dow is price-weighted, meaning companies with higher share prices have more influence on its movements. Although it represents only 30 companies and is not fully diversified, it is commonly used in the media as a snapshot of how the US stock market is performing overall.
Approximate Top US Companies Weightings in the Dow (as of early 2026): Goldman Sachs 11.2 %, Caterpillar 9.4 %, Microsoft 5.0 %, Home Depot 4.9 %, Sherwin‑Williams 4.6 %, Amgen 4.5 %, American Express 4.3 %, McDonald’s 4.1 %, Visa 4.0 %, JPMorgan Chase 3.8 %.
The NASDAQ is an index of 100 large non-financial companies listed on NASDAQ, with strong exposure to technology and growth stocks. It tends to be more volatile than the S&P 500.
The NASDAQ Composite is a market-cap weighted index that tracks nearly all companies listed on the NASDAQ exchange, with a strong focus on technology and growth stocks. The NASDAQ Composite typically tracks more than 3,000 stocks. Here’s a current snapshot of the top 10 companies listed on the Nasdaq by market capitalisation — i.e., the largest firms in the US stock market that trade on the NASDAQ exchange (figures and rankings approximate as of early 2026 and change frequently with stock prices): NVIDIA, Apple, Alphabet, Microsoft, Amazon, Meta Platforms, Tesla, Broadcom, ASML Holding, PepsiCo.
Real time data on the E-mini Dow Jones Industrial Average Index Futures (US 30 Futures). The Dow Jones futures index is a price-weighted average of blue-chip stocks that are generally the leaders in their industry. Dow Jones Futures are tradable in pre-market.
SPX: S&P 500 Index: 500 large caps - Market-cap - Core US benchmark
IXIC: Nasdaq Composite Index: Market-cap - Weighted - 3,000 equities
NYSE Composite Index: All NYSE stocks - Market-cap - NYSE-wide view
DJI: Dow Jones Industrial Average Index: 30 stocks - Price-weighted - Media reference
RUI: Russell 1000 Index: Large caps - Market-cap - Institutional benchmark
RUT: Russell 2000 Index: Small caps - Market-cap - Small-cap performance
Wilshire 5000 Index: Total US market - Market-cap - Total market exposure
S&P 500 Equal Weight Index: Large caps - Equal weight - Breadth analysis
S&P 500 E-mini Futures (ES1!) - Core US market direction
Nasdaq 100 E-mini Futures (NQ) - Growth and technology sensitivity
Russell 2000 E-mini Futures (RTY) - Small-cap and domestic growth signal
VIX Futures Index: Market fear expectations
US M2 Money Stock (M2) USD: The total supply of cash (liquid and near-liquid) money in the US economy.
US Gross Domestic Product % (GDP) Rate: Measures the total value of all goods and services.
US Gross Domestic Product $ (GDP) USD: Gross domestic product (GDP), the featured measure of U.S. output.
For 2026, real GDP growth is projected between 1.8% and 2.6% by major institutions like Vanguard and Goldman Sachs.
US Government Debt (USGD): The United States government debt. $38.5 trillion as of January 2026.
US Government Budget Ratio (USGBP): Payments received and payments made by the government.
US Consumer Price Index 2026 (CPI): Jan 2026 - Inflation across a basket of goods and services.
US Core Inflation Rate YoY % (CIR): Excludes volatile food and energy prices.
US Core Consumer Prices 2025 (CCP): Dec 2025 - Inflation across a basket of goods and services.
The PCE is the most important inflation metric for policy.
US Core PCE Price Index (PCE): Core Personal Consumption Expenditures.
US Core PCE Price Rate % (PCE): By product type, PCE can be classified into goods (35%) and services (65%).
Core PCE Index, is expected to stabilize near 2.60% by late 2026.
US Unemployment Rate %: Unemployment rate measures job seekers.
Analysts forecast this rate will hover between 4.2% and 4.4% through the end of 2026.
US 10-year yield: A proxy for mortgage rates and investor sentiment about the economy.
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