NASDAQ
Definition
Nasdaq is a U.S. stock exchange, launched in 1971 as the world's first electronic marketplace, and also the name of the stock indexes tracking the companies listed on it.
Detailed Explanation
The word does triple duty, and separating the three meanings resolves most confusion. The exchange is the marketplace where shares trade. The Nasdaq Composite is an index of essentially every common stock listed there (more than 3,000 companies) and it's what a headline means by "the Nasdaq closed up." The Nasdaq-100 is a narrower index of 100 of the largest non-financial companies on the exchange, and it's what the popular QQQ fund tracks. Nasdaq, Inc. is separately a publicly traded company that owns the exchange.
The exchange launched on February 8, 1971, created by the National Association of Securities Dealers — the acronym originally stood for National Association of Securities Dealers Automated Quotations. Its innovation was structural: rather than a physical floor with a specialist managing each stock, Nasdaq ran a computerized network of competing market makers posting bid and ask quotes electronically. That was genuinely new, and it's why Nasdaq is described as the first electronic stock market.
The New York Stock Exchange kept a trading floor for decades afterward, though today both operate overwhelmingly electronically, and the practical difference for a retail investor placing a trade is essentially nil.
Nasdaq became the default venue for technology and high-growth companies, a reputation established early (Intel listed there in 1971) and reinforced by Apple, Microsoft, Amazon, and later arrivals. The exchange organizes listings into three tiers with different requirements: the Global Select Market at the top, then the Global Market, then the Capital Market for smaller companies.
Which tier a company sits in tells you something about its size and reporting obligations. Companies choose a listing venue partly on those requirements and partly on fees, which is why an initial public offering involves picking an exchange as one of its decisions.
The tech concentration is what actually matters for investing decisions. Because the Nasdaq Composite and Nasdaq-100 are both market cap weighted and heavily weighted toward technology, they behave differently from broader benchmarks (sharper gains in tech-led rallies, sharper drawdowns when the sector turns). A Nasdaq-100 fund is a concentrated sector-tilted bet, not a diversified core holding, even though it holds 100 companies. Investors who want broad U.S. exposure typically use a total market or S&P 500 index fund instead, or hold Nasdaq exposure alongside one rather than in place of it.
Example
Suppose you buy shares of a company listed on Nasdaq through your brokerage account. Your order routes to the exchange, where market makers and other participants match it electronically (there's no floor and no specialist).
If that company is among the 100 largest non-financial firms listed there, it's also a Nasdaq-100 constituent, so every fund tracking that index holds it. And whatever happens to its share price contributes to the Nasdaq Composite. Same company, three different roles.
Key Articles Related To NASDAQ
Related Terms
Nasdaq Composite: A market cap weighted index of essentially all common stocks listed on the Nasdaq exchange, over 3,000 in total.
Nasdaq-100: An index of 100 of the largest non-financial companies listed on Nasdaq, reconstituted each December and tracked by widely held ETFs.
Dow Jones Industrial Average: A price-weighted index of 30 large U.S. companies, frequently cited alongside the Nasdaq in market coverage.
Stock Exchange: A regulated marketplace where shares are listed and traded, of which Nasdaq and the NYSE are the two largest in the U.S.
Market Maker: A firm that continuously quotes both buy and sell prices in a security, providing the liquidity that made Nasdaq's original dealer model work.
FAQs
What does NASDAQ stand for?
National Association of Securities Dealers Automated Quotations. The full name reflects its origin as a computerized quotation system launched by the NASD in 1971. It's now written as "Nasdaq" and functions as a name rather than an acronym.
Is the Nasdaq an exchange or an index?
Both, which is the main source of confusion. Nasdaq is a stock exchange where shares trade, and it lends its name to the Nasdaq Composite and Nasdaq-100 indexes that measure the companies listed on it.
What's the difference between the Nasdaq Composite and the Nasdaq-100?
The Composite includes essentially every stock listed on the exchange, over 3,000 companies. The Nasdaq-100 holds 100 of the largest non-financial ones. The Nasdaq-100 is more concentrated and more heavily weighted toward large technology companies.
How is Nasdaq different from the NYSE?
Historically, Nasdaq used a network of competing electronic market makers while the NYSE used floor specialists. That gap has largely closed as both moved to electronic trading. The remaining differences are listing requirements, fees, and the mix of companies each attracts (Nasdaq skews toward technology and growth).
Can I invest in the Nasdaq?
Not the exchange itself as an index, but you can buy funds tracking its indexes (Nasdaq-100 ETFs are among the most heavily traded funds available). Separately, Nasdaq, Inc. is itself a publicly traded company whose shares you can buy.
Is a Nasdaq index fund a good core holding?
It's a sector-tilted bet more than a diversified base. The heavy technology weighting means it outperforms in tech-led rallies and falls harder when the sector corrects. Most investors seeking broad U.S. exposure use a total market or S&P 500 fund as the core and treat Nasdaq exposure as an addition.