S&P 500 Companies by Weigh

The S&P 500 component weights are listed from largest to smallest. Data for each company in the list is updated after each trading day. The S&P 500 index consists of most but not all of the largest companies in the United States. The S&P market cap is 70 to 80% of the total US stock market capitalization. It is a commonly used benchmark for stock portfolio performance in America and abroad. Beating the performance of the S&P with less risk is the goal of nearly every portfolio manager, hedge fund and private investor.

Nasdaq 100 Companies

The Nasdaq 100 company weights are listed from largest to smallest. The index is heavily concentrated with technology companies but also includes companies from other sectors. It is often used as a barometer of the health of the technology sector. The largest twenty companies comprise most of the weight in the index.