What it means
Nasdaq began in 1971 as an electronic securities market, and its exchange provides a place for eligible securities to trade under listing and market rules. An exchange is not the same as a share index, though a company may be listed there and included in an index.
The Nasdaq Composite tracks a broad set of eligible securities listed on the Nasdaq Stock Market under its methodology. It is market-capitalisation weighted, so larger issuers can have a larger effect on its movements, and it is not a measure of every US business.
The Nasdaq-100 is a more selective index of large non-financial Nasdaq-listed companies under its own rules. It is not the top 100 companies in the world, nor exactly the same as a technology-sector index, and membership and weights can change over time.
Technology and growth companies have often been prominent in these indexes, but their exact sector weights and volatility depend on current membership and market prices, so a historic pattern is not a forecast. An index movement is a weighted summary, not the return every constituent earned, because a few large companies can lift the headline while many others decline.
Investors should check the particular index methodology, sector exposure and their actual fund holdings. A fund that tracks an index can differ from it because of fees, sampling, cash holdings or tracking error, and buying shares in a Nasdaq-listed company is different from buying a fund that tracks the Composite or Nasdaq-100.
Nasdaq the company also provides market technology and other services, and names shared by related market entities do not make them the same exchange or index. Nasdaq Dubai, for example, is a separate venue, so specify the market and governing rules in a business discussion.
Read the product documents before making any investment choice. For a business owner, index changes may offer one clue about investor sentiment in some sectors.
They do not determine the firm's borrowing terms, sales or valuation by themselves, so use the relevant companies and market conditions rather than relying on a headline alone.
In practice
Real-world examples.
Example
A technology company chooses to list on Nasdaq for its initial public offering, raising $300 million from investors.
Example
The Nasdaq Composite falls 4% in a day after higher-than-expected inflation data, while broader indexes fall about 2%.
Example
An investor buys a fund that tracks the Nasdaq-100 to gain exposure to large technology and growth companies in one investment.
Formula
Calculation
Simple percentage change in an index level = (later level - earlier level) / earlier level x 100. This is a price-level movement over the stated interval, not automatically a fund investor's after-fee return.
Worked fictional example. An illustrative index level moves from 18,000 to 18,450. The change is 450 / 18,000 x 100 = 2.5%. The levels are fictional, not live Nasdaq prices. A fund holder's result may differ because of timing, distributions, currency and fees.
Percentage moves do not simply add. If the same fictional index then falls from 18,450 to 17,900, the change is -550 / 18,450 x 100 = about -3.0%. Despite a 2.5% rise followed by a 3.0% fall, the index ends at 17,900, which is 100 / 18,000 x 100 = about 0.6% below where it began.Case study
Seen in the real world.
This illustrative and entirely fictional example follows Fatima, an owner who hears that "Nasdaq" gained sharply. She checks whether the report refers to the Composite or the Nasdaq-100 and then reads her own fund's prospectus. Its holdings are concentrated in a smaller group of large companies than she expected. Fatima needs some savings in a few years, so she reviews risk, currency and time horizon rather than assuming the recent rise will continue. In this fictional scenario she chooses a broader allocation after professional advice.
The specific percentage is her own choice, not a general rule. Later, an index falls while her company continues to sell well. She learns to treat an index as a market measure rather than a direct verdict on her business or a guaranteed guide to a particular investment. Her concentration check is simple arithmetic. If five of the fund's holdings make up 40% of its value and those five fall 10%, the fund falls about 0.40 x 10% = 4% from those names alone, or $2,000 on a $50,000 holding.
Watch out
Common mistakes.
- Using "Nasdaq" without distinguishing exchange, Composite, Nasdaq-100 or a particular fund.
- Assuming an index return represents every listed company or a fund's after-fee result.
- Treating historic technology concentration or volatility as a fixed current weighting and future prediction.
Questions
People also ask.
What is the difference between Nasdaq and the NYSE?
Both operate US stock markets. Their listing and trading models differ, but either can list companies in many sectors.
What is the Nasdaq-100?
It is an index of large non-financial Nasdaq-listed companies selected under published rules. It is separate from the broader Composite.
Can investors in the UAE buy Nasdaq shares?
Access depends on the broker, account and applicable rules. Check fees, currency and the difference between a listed share and an index fund.
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