Verified: November 5, 2026, at 9:07 p.m. UTC (UTC+00:00).
The Nasdaq Composite and the S&P 500 both track stock prices, but they answer different questions. The Nasdaq Composite measures eligible stocks listed on the Nasdaq Stock Market, including companies based outside the United States. The S&P 500 measures the performance of 500 selected large U.S. companies listed on eligible U.S. exchanges.
That difference matters when market headlines report that one index rose while the other fell. Their company selection and weighting methods are different, so the same trading day can produce different results. Also check which Nasdaq index a report means: the Nasdaq-100 is a separate, narrower benchmark.
Destaques
An index is a calculated measure of a defined group of securities. Its provider sets rules for which securities can be included, how much weight each receives, and how the list changes over time. When an index rises, its calculation reflects an overall increase in the value of its components according to those rules. It does not mean every stock in the index rose.
Market capitalization, or market cap, is a common starting point for weighting. It is generally a company's share price multiplied by its shares outstanding. In a market-cap-weighted index, a larger company normally has more influence than a smaller one. Different indexes may adjust that calculation, however, so knowing the weighting method matters as much as knowing the number of companies.
The Nasdaq Composite measures eligible common-type securities listed on the Nasdaq Stock Market. Its scope includes domestic and international companies, and it spans a range of company sizes and industries. Nasdaq's Composite methodology sets the eligibility rules; exchange-traded funds, preferred stocks, and several other security types are generally excluded.
The Composite is often associated with technology because many large technology businesses are listed on Nasdaq. It is not a technology-only index: it also includes businesses from other sectors, including financials. Its market-cap weighting means that a large company can have a much greater effect on the index than a small one. Nasdaq says the Composite uses listed market capitalization without a float adjustment or concentration caps. See its comparison of the Composite and Nasdaq-100.
The S&P 500 is designed to measure the large-cap segment of the U.S. equity market. It contains 500 selected companies and is widely used as a benchmark for U.S. stocks, although it does not include every publicly traded U.S. business or represent the entire global market.
Inclusion is not simply a matter of taking the 500 biggest companies. Eligibility includes requirements relating to U.S. domicile, size, liquidity, public float, and financial viability. An index committee selects among eligible companies and considers sector representation. Meeting the criteria alone does not guarantee inclusion, as S&P Dow Jones Indices explains.
The S&P 500 uses float-adjusted market-cap weighting. In practical terms, the calculation emphasizes shares available for public trading rather than treating all outstanding shares as equally available. Larger constituents by this measure have more influence over index movements. The provider describes the construction in its U.S. indices methodology.
No. The Nasdaq-100 tracks 100 of the largest eligible nonfinancial companies listed on Nasdaq, including U.S. and international businesses. It excludes financial companies and uses a modified market-cap weighting method. A company with multiple eligible share classes can cause the number of securities to exceed the number of companies.
The Composite has a much wider listing-based scope and includes financial companies. Both indexes can be influenced heavily by large technology-related businesses, but their membership and weighting rules differ. Check the full index name before comparing a chart, headline, or investment product. Nasdaq provides further details in its Nasdaq-100 methodology.
The indexes have overlapping companies, but overlap does not make them identical. A stock may have a different weight in each index, appear in only one, or be affected by a different weighting adjustment. Sector exposure matters too: if a group of heavily weighted technology stocks rises while other industries fall, an index with greater exposure to those stocks may perform differently.
For example, imagine a large technology company rises sharply on a day when banks and energy companies decline. The effect on each index depends on whether those businesses are included and how much weight they carry. This is an illustration, not a forecast. Index composition and weights change, so yesterday's relationship will not necessarily hold tomorrow.
Compare percentage changes over the same period rather than raw point moves. Index levels have different starting values and calculation histories, so a 100-point move in one index is not directly comparable with a 100-point move in another. Also check whether a chart shows a price return, which excludes reinvested dividends, or a total return, which accounts for them.
Choose the benchmark that matches the exposure you want to understand. The S&P 500 is a useful reference for selected large U.S. companies; the Nasdaq Composite provides a view of eligible Nasdaq-listed securities; and the Nasdaq-100 focuses on large Nasdaq-listed nonfinancial companies. None is a complete measure of the world's stock markets.
An index itself is a calculation, not a security that can be bought directly. Funds can seek to track an index, but check their benchmark, fees, tracking difference, distribution policy, and currency exposure. For a UK investor measuring results in pounds, movements between sterling and the U.S. dollar can raise or lower the sterling value of unhedged U.S. investments, even if the underlying index is unchanged in dollars. A fund's trading currency alone does not establish whether its currency exposure is hedged.
Risk depends on the specific Nasdaq index, its current holdings, and the period measured. Concentration in particular large companies or sectors can make its performance differ substantially from the S&P 500; neither index has a guaranteed future risk level.
Some are. An eligible large U.S. company listed on Nasdaq can be included in both the Nasdaq Composite and the S&P 500, but the indexes also contain different companies and assign different weights.
It depends on the version quoted. The price index excludes dividend reinvestment; total-return versions incorporate dividends under their respective calculation rules.
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