The S&P 500 is a stock market index that includes 500 large-cap companies, representing a broad cross-section of the U.S. economy. It actually comprises 503 common stocks issued by these 500 companies due to some companies having multiple share classes

. Some of the largest and most influential companies in the S&P 500 by market weight include:

• Apple Inc. (AAPL)
• Microsoft Corp (MSFT)
• Nvidia Corp (NVDA)
• Amazon.com Inc (AMZN)
• Alphabet Inc. (Google's parent company)
• Berkshire Hathaway
• Meta Platforms (Facebook)
• Tesla, Inc.
• Johnson & Johnson
• JPMorgan Chase & Co.

These companies are among the top holdings and heavily influence the index's performance

. The full list of all 500 companies is extensive and includes firms from various sectors such as technology, healthcare, financials, consumer goods, energy, and industrials. Examples of other companies in the index are:

• Comcast Corporation
• Lowe's Companies, Inc.
• Bristol-Myers Squibb Company
• Starbucks Corporation
• Nike, Inc.
• McKesson Corporation
• General Motors Company
• Target Corporation
• FedEx Corporation
• Delta Air Lines, Inc.

This diverse mix reflects the broad market coverage of the S&P 500

. For a detailed and up-to-date list, sources like Wikipedia, Slickcharts, and financial data websites provide comprehensive tables of all S&P 500 companies and their market data