Nasdaq Explained: What Every Investor Needs to Know

TL;DR： Nasdaq is a U.S. stock exchange that operates electronically and is renowned for its concentration of technology companies. What investors often refer to as the “Nasdaq” actually points to two different indices: the Nasdaq Composite Index, which covers more than 3,000 stocks, and the Nasdaq-100 Index, which represents the 100 largest non-financial companies. Understanding the difference between the two helps investors more clearly grasp global technology stock trends.

When global investors talk about technology stocks, Nasdaq is almost impossible to avoid. For many Hong Kong investors, “the Nasdaq” is one of the most frequently encountered terms when investing in U.S. equities—yet its true meaning is not always fully understood. Is Nasdaq an exchange, or is it an index? Why is it regarded as a benchmark for technology stocks? Starting from the basics, this article provides a comprehensive explanation of Nasdaq’s structure, operating mechanisms, and its significance for investors, helping you build a solid foundation of understanding.

What Is Nasdaq? Starting With the Name

The full English name of Nasdaq is the National Association of Securities Dealers Automated Quotations, which in Chinese means “全國證券交易商協會自動報價系統.” The name itself highlights its core characteristic: replacing traditional manual price quotations with an automated electronic system. From the outset, Nasdaq positioned itself as a technology-driven, modern trading platform.

Nasdaq was officially established on February 8, 1971, becoming the world’s first fully electronic stock exchange. Before then, over-the-counter stock trading relied on telephone matching, which was inefficient and lacked price transparency. Nasdaq’s emergence fundamentally transformed market operations by centralizing quotation information within computer systems, significantly improving trading speed and fairness.

Differences Between Nasdaq and the New York Stock Exchange

Many people tend to confuse Nasdaq with the New York Stock Exchange (NYSE). While both are major U.S. stock exchanges, there are several clear differences.

The NYSE has a history spanning more than a century and has traditionally maintained a physical trading floor, with some trades still involving manual processes. In contrast, Nasdaq has operated entirely on an electronic platform since its founding and does not have a physical trading floor. In addition, listing requirements differ between the two exchanges—historically, Nasdaq has been more flexible toward emerging companies, attracting a large number of technology startups and high-growth firms to list there.

The Two Core Nasdaq Indices

When investors say, “the Nasdaq rose today,” they are usually referring not to the exchange itself, but to the performance of its related indices. Nasdaq has two of the most frequently cited indices, each built with a different design in mind.

Nasdaq Composite Index

The Nasdaq Composite Index is the broadest gauge, covering all stocks listed on the Nasdaq exchange—currently more than 3,000. The index is calculated using market-cap weighting, meaning larger companies have a greater impact on index performance. Because all Nasdaq-listed stocks are automatically included, the Composite has extremely broad coverage, encompassing both technology giants and smaller companies.

Nasdaq-100 Index

The Nasdaq-100 Index (NDX), established in 1985, is the “refined” version of the Composite. It includes only the 100 largest non-financial companies listed on Nasdaq. Financial companies are excluded, making it more focused on reflecting the performance of leading firms in technology, consumer, biotechnology, and related sectors.

Tip: The Composite is “broad and comprehensive,” reflecting the overall performance of the Nasdaq market, while the Nasdaq-100 is “focused and concentrated,” highlighting the largest non-financial companies and more directly representing leading technology stocks. When referencing data, investors should note which index is being cited.

In addition, the index applies caps on constituent weights to ensure that no single stock exerts an excessive influence. This allows the index to better reflect overall industry trends rather than being dominated by one or two individual stocks.

Why Is Nasdaq Considered a Benchmark for Technology Stocks?

Nasdaq’s reputation as a technology stock benchmark is closely tied to its historical background and listing policies. Compared with traditional exchanges, Nasdaq has more flexible listing requirements, enabling many fast-growing technology companies—often not yet meeting conventional profitability thresholds—to raise capital through public listings.

During the internet boom of the 1990s, many large technology companies chose to list on Nasdaq, further cementing its status as the exchange for technology stocks. Today, representative companies in fields such as artificial intelligence (AI), cloud computing, and biotechnology continue to favor Nasdaq for their listings.

Technology-related companies have long accounted for a relatively high proportion of the Nasdaq Composite Index, far exceeding sectors such as industrials, energy, or traditional finance. This structural characteristic makes Nasdaq indices particularly sensitive to the overall conditions of the technology sector, turning them into key reference points for tracking global technology stock trends.

Nasdaq’s Market Maker System

Nasdaq’s electronic advantage is partly attributable to its unique market maker system. Market makers are independent securities dealers that continuously provide bid and ask quotations for specific stocks, ensuring market liquidity.

Each stock listed on Nasdaq must have at least two market makers providing continuous quotations. For actively traded large-cap stocks, the number of market makers can reach dozens. This mechanism ensures that investors can always find a counterparty without waiting for another buyer or seller to appear, significantly enhancing market efficiency.

This differs from the traditional “auction-style” model used by some exchanges, where trades are primarily matched directly between actual buyers and sellers in the market.

How Can You Invest in Nasdaq?

For Hong Kong investors, trading individual Nasdaq-listed stocks directly is feasible. However, the following approaches are more common for participating in overall index performance.

Participating Through Exchange-Traded Funds

Exchange-traded funds (ETFs) are among the most common tools for tracking the Nasdaq-100 Index. Take the Invesco QQQ Trust ETF (ticker: QQQ) as an example: it is one of the largest and most actively traded ETFs globally, allowing investors to gain exposure to a portfolio of the top 100 technology companies through a single product.

Another product, QQQM, also tracks the Nasdaq-100 Index but differs from QQQ in expense ratio, share price, and other characteristics. Investors can compare these features based on their own needs.

Note: ETF prices fluctuate daily with market movements, and investors must bear the corresponding market risks. Past performance does not guarantee future results. Before investing, investors should carefully review the prospectus and understand the associated risks.

Trading Individual Constituents

Investors may also trade individual stocks listed on Nasdaq, such as representative companies in the technology sector. This approach requires stronger stock-specific analysis skills and may involve higher volatility than index-tracking ETFs. Investors interested in exploring more U.S. stock investment opportunities may refer to Longbridge Securities’ investment product page to learn about the range of markets available on the platform.

Risks to Understand Before Investing in Nasdaq

Historically, Nasdaq indices have experienced multiple cycles of ups and downs and are characterized by pronounced volatility. Investors should fully understand the following risks before participating.

Concentration Risk

A defining feature—and a major source of risk—of the Nasdaq-100 Index is its high concentration in a small number of mega-cap technology stocks. The combined weighting of the top ten constituents has long exceeded half of the total index weight. This means that if several leading stocks perform poorly, the entire index can be significantly dragged down, limiting diversification benefits.

Interest Rate Sensitivity

Valuations of growth-oriented technology stocks are often based on high expectations of future earnings. When market interest rates rise, the discounted value of future cash flows declines, placing greater pressure on high-valuation technology stocks. As a result, the index is particularly sensitive to interest rate policies.

Sector Volatility Risk

The technology sector inherently carries higher business risks, including rapid technological change, regulatory shifts, and uncertainty in earnings forecasts. Especially during periods of sharp changes in market sentiment, technology stocks often experience greater volatility than more traditional industries.

Before considering Nasdaq-related investments, investors are advised to deepen their market knowledge through Longbridge Academy and use market data tools to track index performance, thereby formulating an investment plan aligned with their personal risk tolerance.

Frequently Asked Questions

Is Nasdaq an exchange or an index?

Both. Nasdaq itself is a stock exchange where companies list their shares and investors trade stocks. “Nasdaq indices,” on the other hand, are market benchmarks calculated based on stocks listed on the exchange to reflect overall market performance. When the media reports that “the Nasdaq rose or fell today,” it usually refers to movements in the Nasdaq Composite Index or the Nasdaq-100 Index.

What is the difference between Nasdaq and the S&P 500?

The S&P 500 Index covers 500 large companies listed across major U.S. exchanges and features a more balanced sector distribution, including technology, financials, healthcare, and energy. In contrast, the Nasdaq Composite Index includes a larger number of constituents but has a much higher weighting in technology stocks, resulting in generally higher volatility. Each index has a different focus, and together they serve as important reference tools for observing the U.S. equity market.

How can Hong Kong investors trade Nasdaq-related products?

Hong Kong investors can trade U.S. stocks or ETFs listed on Nasdaq through licensed brokerage platforms. Longbridge Securities holds the relevant licenses issued by the Hong Kong Securities and Futures Commission and provides U.S. stock trading services. For information on opening a U.S. stock account, completing the W-8BEN tax form, and understanding basic trading rules, please refer to the Guide to U.S. Stock Account Opening and Trading Strategies for Hong Kong Investors.

What are Nasdaq’s trading hours?

Nasdaq’s regular trading hours are from 9:30 a.m. to 4:00 p.m. Eastern Time (corresponding to 9:30 p.m. to 4:00 a.m. Hong Kong time during daylight saving time, and 10:30 p.m. to 5:00 a.m. during standard time). Some brokers also offer pre-market and after-hours trading sessions, though liquidity and trading volume are typically lower than during regular hours. In addition, U.S. markets observe public holidays and may close early on certain days. Investors can refer to the U.S. Stock Market Holiday Schedule and Trading Strategies to plan ahead.

Conclusion

Nasdaq is not only a stock exchange but also a barometer of global technological innovation. Understanding its structure, index classifications, and operating mechanisms is a fundamental step toward gaining insight into the U.S. equity market. Whether investing directly in technology stocks or participating in index performance through ETFs, investors should fully understand the associated risks and develop prudent strategies based on their investment objectives and risk tolerance.

The choice of investment tool depends on your goals, risk tolerance, market outlook, and level of experience. Regardless of which tool you choose, it is essential to fully understand its operating mechanics, risk characteristics, and trading rules, and to establish a robust risk management plan. You can learn more about investing through Longbridge Academy or by downloading the Longbridge App.