S&P 500 Top 50 Companies by Market Cap: 2025
Top 50 S&P 500 Companies by Market Capitalization
Current Data Overview
| Rank | Ticker | Company Name | Share Price ($) | Market Cap ($) | GICS Sector | Index Weight (%) |
|---|
Sector Distribution
Company Count by GICS Sector
Market Capitalization Leaders
Top 15 Companies by Market Cap
How Index Weight Differs from Market Cap
It's important to comprehend the S&P 500 weight vs market cap. Index weight shows how each stock affects the performance of the S&P 500, whereas market capitalization ranks businesses according to their entire worth. We determine weight as a percentage by dividing the market capitalization of each individual firm by the total market capitalization of the 500 constituents. Both categories are dominated by tech corporations in 2025; Microsoft alone makes up more than 6% of the index.
Spotlight on Small Market-Cap Leaders
Even though the top five companies are worth more than $1 trillion, our list also includes minor S&P 500 market cap leaders like Palantir (PLTR) and ServiceNow (NOW), which are under $300 billion innovators with exceptional growth potential. Before they rise in the rankings, keeping an eye on these midsize players can reveal special investment opportunities.
S&P 500 2025's Largest Market Capitalization
The few mega-cap firms that control U.S. stocks and, consequently, international markets are the focus of our discussion on the greatest market cap S&P 500 2025. Just five companies— Microsoft, Apple, NVIDIA, Amazon, and Alphabet—will account for almost 25% of the index's total value in 2025.
2025’s Top Five by Market Cap
Key Insight: The top 5 mega-cap firms (Microsoft, Apple, NVIDIA, Amazon, Alphabet) collectively represent nearly 25% of the S&P 500's total value in 2025, underscoring their significant market influence.
Visualizing Market Cap Dominance
The chart below illustrates the approximate market capitalization of these leading companies in 2025.