Nasdaq 100 What Is It? A Beginner’s Guide to the Index

Nasdaq 100 what is it? The Nasdaq-100 is a stock market index designed to track 100 of the largest non-financial companies listed on the Nasdaq Stock Market. It includes businesses from different industries, although many people associate it mainly with large technology companies.

The index is a benchmark: it measures how a selected group of securities performs over time. It is not a company, an exchange, or a stock that you can buy directly. This guide explains how the Nasdaq-100 works, how it differs from other indexes, and what risks its composition can create.

Important: An index’s past performance does not predict future results. Funds and other products that track an index can lose value, and their fees and returns may differ from the index itself. This article is for educational purposes only and is not investment advice.

What Is the Nasdaq-100 Index?

The Nasdaq-100, often identified by the ticker symbol NDX, measures the performance of large domestic and international non-financial companies listed on Nasdaq. Nasdaq’s methodology selects eligible companies primarily by market capitalization and applies additional listing, liquidity, and other eligibility rules.

The “100” refers to the number of companies the index is designed to represent. The number of individual securities can be slightly higher if a company has more than one eligible share class. Financial companies, including investment companies, are excluded. The index includes businesses in technology, consumer services, health care, industrials, and other sectors, so it is not a technology-only index.

Nasdaq reviews its methodology and index composition over time. For that reason, the companies included and their weights can change. Nasdaq’s current Nasdaq-100 methodology explains the eligibility and weighting rules.

How Does the Nasdaq-100 Work?

The Nasdaq-100 is weighted using a modified market-capitalization approach. Market capitalization is the total market value of a company’s outstanding shares. In a basic market-cap-weighted index, larger companies have more influence on the index’s movement than smaller ones.

The Nasdaq-100 modifies that approach through rules that adjust company weights and limit concentration. This means the biggest companies can still have a substantial effect, but their influence is subject to the index methodology. If a large constituent rises or falls, its movement may affect the index more than a smaller constituent’s movement.

Nasdaq reconstitutes the index annually and rebalances it quarterly, subject to its methodology and any special adjustments. Reconstitution determines which eligible companies belong in the index; rebalancing adjusts the weights of companies that remain. These processes do not prevent losses or ensure that the index will hold companies that perform well in the future.

Nasdaq-100 vs. Nasdaq Composite vs. S&P 500

These indexes are often discussed together, but they track different groups of companies. The Nasdaq-100 focuses on large non-financial companies listed on Nasdaq. The Nasdaq Composite covers a much broader range of Nasdaq-listed stocks, including financial companies. The S&P 500 tracks 500 leading U.S. companies across industries and exchanges.

The S&P 500 is also market-cap weighted, while the Nasdaq-100 uses modified market-cap weighting. Both can be influenced heavily by their largest companies, though their selection rules and sector exposure differ. Nasdaq’s Nasdaq Composite methodology and S&P Dow Jones Indices’ S&P 500 overview describe their respective approaches.

What Can Affect the Nasdaq-100?

Because the index contains large companies whose share prices can move sharply, its value may respond to company earnings, economic data, interest-rate expectations, changes in consumer demand, and shifts in investor sentiment. A handful of the largest constituents can have an outsized effect on daily performance.

Sector concentration is another consideration. The index includes businesses from several industries, but its weighting can leave it more exposed to some sectors than a broader index. A decline in a heavily weighted sector or company may therefore have a noticeable effect. Diversification across multiple constituents does not eliminate market risk.

Warren Buffett made a broader point about owning a range of businesses in his 2013 Berkshire Hathaway shareholder letter: “own a cross-section of businesses that in aggregate are bound to do well.” His discussion recommends an S&P 500 index fund for a trust; it is not a specific endorsement of the Nasdaq-100, which has different constituents and risks.

For context, the full letter discusses broad-market investing and specifically refers to the S&P 500. Read the original shareholder letter.

Can You Invest Directly in the Nasdaq-100?

No. An index is a calculation used to measure a group of securities; it is not itself an investment product. Investors may get exposure through funds or other products designed to track the index, but each product has its own structure, fees, risks, and tracking differences. As Investor.gov explains, an index fund may track an index, but an investor cannot buy the index directly.

Before assessing any product, understand what it tracks, how it is weighted, what it costs, and how it may behave in a declining market. A product linked to the Nasdaq-100 is not identical to owning every company in the index directly.

Key Takeaways

• The Nasdaq-100 tracks 100 of the largest eligible non-financial companies listed on the Nasdaq Stock Market.
• It is not the same as the Nasdaq exchange, the Nasdaq Composite, or the S&P 500.
• Its modified market-cap weighting means larger companies can have more influence on performance.
• The index cannot be purchased directly; products that track it carry their own fees and risks.
• Sector and constituent concentration can increase volatility, and losses are possible.

Educational notice: This article is for educational purposes only. It is not investment, tax, or legal advice, and it is not a recommendation to buy or sell any security. Investing involves risk, including the possible loss of principal.