If you want to avoid relying too heavily on a handful of technology companies, compare what an investment actually owns—not just whether it is called an index fund. A broad index fund can spread company-specific exposure across many businesses, yet still give its largest companies a substantial share of the portfolio. Individual stocks offer direct exposure to chosen companies but can leave a small portfolio dependent on a few business outcomes.
What you are choosing: a basket or selected companies
Individual stocks
When you buy an individual stock, you own shares in that company. Your result depends on the companies you select, the prices you pay, and how those businesses perform. A portfolio of only a few stocks is particularly exposed to company-specific setbacks: one company’s poor results can have a large effect on the whole portfolio. That does not mean a few stock picks must perform worse in every case; it means their outcomes depend more on those particular choices.
Index funds
An index is a measure of a market or segment, not an investment you can buy directly. An index mutual fund or exchange-traded fund (ETF) seeks to track an index, typically by holding all its securities or a representative sample. The fund’s holdings and the index’s rules determine the exposure you receive. Investor.gov’s index fund guide explains these mechanics.
Many indexes weight companies by market capitalization, so larger companies get larger portfolio weights. A fund can therefore hold hundreds of companies without distributing its assets evenly among them. Its largest constituents may still drive a meaningful share of its returns.
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What does “not betting on a few tech giants” mean?
That concern can refer to two different kinds of concentration:
- Company-specific concentration: how much the portfolio depends on the fortunes of a small number of companies.
- Sector or large-company concentration: how much of the portfolio is tied to a particular industry or to its largest businesses, even if the portfolio owns many other companies too.
A broad market-cap-weighted index fund may address the first concern by spreading exposure across many companies, while leaving considerable weight in its largest constituents. If you also want to understand sector exposure, look at the fund’s current sector weights and largest holdings rather than assuming a large holdings count means a balanced mix.
For a dated illustration, S&P Dow Jones Indices reported that Information Technology represented 32.9% of the S&P 500 (MYR) sector breakdown as of March 31, 2026; the factsheet rounds sector weights to the nearest tenth. This is a figure for that index variant and date, not the S&P 500’s allocation in October 2026 or a timeless measure of technology exposure. See the S&P 500 (MYR) factsheet.
Are index funds automatically diversified?
No. Diversification can reduce the effect of one investment’s loss, but it does not prevent losses or eliminate market risk. A mutual fund or ETF is not automatically diversified: a narrow fund may focus on a single industry, and multiple funds may hold many of the same companies. Investor.gov describes diversification as spreading money among different investments to reduce risk.
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How to compare a stock portfolio or index fund
- List the actual holdings. For a fund, check its latest holdings and the weights of its largest positions. For multiple funds, compare their holdings across the portfolio rather than reviewing each in isolation.
- Inspect the index rules. Find out what the benchmark includes, how it weights securities, and whether the fund holds all constituents or samples them. A targeted or complex index can produce a narrower exposure than its name suggests. The SEC also discusses risks in non-traditional index funds.
- Check company and sector concentration. Look beyond the number of holdings. The weights of the largest companies and the fund’s sector breakdown show where the portfolio is most exposed.
- Measure overlap. Compare the largest positions and sector exposures across every fund you own or are considering. Overlapping funds may give you less additional diversification than their separate labels imply.
- Read the costs and tracking information. Review the prospectus fee table and account for other charges. Fees and expenses reduce returns; trading costs and tracking error can also cause an index fund to underperform its benchmark. The SEC recommends comparing fund costs, including through FINRA’s Fund Analyzer. Read the SEC’s July 2025 bulletin on fund fees and expenses.
- Consider the risks and your goals. An index fund retains the risks of the securities and market it tracks. Consider whether the strategy and its specific risks fit your investment goals; no single approach is right for every investor.
Do not assume every index fund is cheaper than every actively managed fund. Costs vary, so compare the actual expenses of the funds you are evaluating. A higher-cost fund must perform better than a lower-cost fund to produce the same return after costs.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Mutual fund or ETF: how trading differs
Index funds come in different structures, and trading mechanics vary by structure. In the United States, mutual fund shares are redeemed at the next calculated net asset value (NAV) on a business day. ETF shares trade on an exchange at market prices while the market is open. Both types can have fees and charges; check the fund’s documents for its specific costs and mechanics. The SEC explains the differences in its guide to mutual funds and ETFs.
These are general U.S.-oriented investing concepts. Tax treatment, account rules, and available investments depend on your jurisdiction and circumstances.
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