Start by measuring what you actually own—including the underlying holdings of every fund—then decide which concentration you want to reduce. A portfolio can hold many tickers and still depend heavily on the same large technology companies. Diversification can spread risk across companies, sectors, company sizes, regions and asset classes, but the right mix depends on your goals, time horizon and ability and willingness to take risk.
Audit your exposure before changing anything
Make an inventory of direct stock holdings and each fund in your account. Record each position’s portfolio weight, then look through every ETF and mutual fund to its disclosed holdings. A fund’s name, number of holdings or sector label does not tell you how much its largest positions overlap with your other investments.
The SEC’s Investor.gov guidance cautions that a mutual fund or ETF “won’t necessarily provide diversification, especially if it is narrowly focused.” Check the funds’ top holdings across your portfolio and note repeated companies. Also record each holding’s sector, company size, geography and asset class. This helps distinguish a single-company bet from a broader tilt toward technology, U.S. mega-cap growth or stocks generally. Investor.gov: Asset Allocation and Diversification
Choose the concentration you want to reduce
Diversification operates at two levels: between asset categories and within them. Owning several stocks may reduce dependence on one company, but it will not necessarily reduce exposure to one industry or a shared market risk. Likewise, adding bonds can change the portfolio’s stock-versus-bond balance, but it does not by itself fix a concentration among the stocks you continue to hold.
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Reduce dependence on a few companies or sectors
Within equities, examine exposure across industries rather than relying on technology alone. Consumer-goods and health-care companies, among other sectors, may have different business drivers. Still, sectors can move together or lose value, and a broader set of stocks does not guarantee a gain or prevent loss.
Reduce a large-cap or growth tilt
If you want broad equity exposure but less dependence on a small group of mega-cap growth companies, compare how a fund invests by company size and investment style. Smaller-company and value-oriented equities are possible dimensions to assess, not automatic recommendations. Their returns may differ substantially from those of large growth stocks, including for long periods.
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A broad index fund is not necessarily an equal-weighted spread across companies. In a market-cap-weighted index, the largest companies receive the largest weights. That means an S&P 500 or total-market fund can still carry substantial exposure to its largest constituents. Review the index methodology and actual fund holdings rather than assuming the word “broad” means low concentration. The SEC explains index-fund construction, fees and risks in its Investor Bulletin on Index Funds.
Reduce a U.S.-only tilt
Equities outside the United States, including developed markets, are another dimension to evaluate if your portfolio is concentrated geographically. International holdings bring their own market and currency risks and can lag U.S. stocks; they are not a guaranteed hedge against a decline in U.S. AI-related shares.
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Reduce stock-market risk overall
Stocks, bonds and cash equivalents have different risk and return characteristics. Stocks generally offer greater growth potential alongside greater volatility; bonds are generally less volatile and offer more modest returns; cash equivalents tend to have low investment-loss risk but can lose purchasing power to inflation. High-quality fixed income may be considered when the aim is to reduce equity risk, but the appropriate amount depends on personal circumstances. The SEC’s Beginners’ Guide to Asset Allocation, Diversification, and Rebalancing describes these trade-offs.
Put market concentration figures in context
T. Rowe Price reported that the ten largest S&P index stocks represented just under 18% of index market capitalization at year-end 2015, 38% by mid-2025 and almost 40% at year-end 2025. These are the firm’s calculations using FactSet Research Systems data, published in its 2026 Q1 report. They describe the ten largest constituents’ share of index market capitalization—not the share of the index attributable to AI, and not any individual investor’s exposure. The report is marked for investment professionals only and not for further distribution. T. Rowe Price, “Revisiting asset allocation in an AI world”
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Compare funds by holdings, construction and cost
Before adding a fund, compare it with what you already own. Two funds with different names may hold many of the same companies; a fund that appears diversified by ticker count may still be dominated by a few positions. Review the prospectus, latest shareholder report and available holding disclosures, and consider:
- Overlap: Which companies recur, and how large are the combined exposures?
- Index design: Is the fund market-cap weighted or constructed another way? What sectors, sizes and regions does it cover?
- Fees and expenses: What does the fund charge, and how do costs affect returns?
- Risks and fit: Could its risks, volatility or divergence from a familiar benchmark conflict with your goal or time horizon?
- Complexity: Will adding it make the portfolio harder to monitor without meaningfully broadening exposure?
Index funds can have tracking error and other risks, and fees reduce returns. A fund’s past or intended breadth does not ensure future performance. The SEC’s index-fund bulletin advises investors to review fund documents, risks, fees and index construction.
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Set an allocation that fits your circumstances
Choose a target mix only after considering what the money is for, when you expect to need it, and how much market loss you can financially and emotionally tolerate. A longer horizon may allow more time to ride out volatility, but it does not make losses impossible; a shorter horizon can make a sharp decline more consequential if you need to sell. There is no universal percentage of technology stocks, equities, bonds or cash that is right for every investor.
Vanguard’s 2026 report discusses high-quality U.S. fixed income, U.S. value and developed markets outside the U.S. as possible opportunities in an AI-era allocation. Its illustrative portfolio may have significant tracking error from a typical 60/40 portfolio; Vanguard says investors should consider their own risk tolerance, investment plans and horizons. Treat those ideas as dimensions for evaluation, not a personal allocation prescription. Vanguard, “AI exuberance: Economic upside, stock market downside”
Be cautious with free allocation or risk questionnaires: the SEC warns that some may be biased toward products sold by their sponsors. A questionnaire can prompt useful questions, but it is not a substitute for a portfolio review grounded in your financial situation.
Rebalance using a rule you can follow
After setting a target allocation, decide how you will respond if market movements push the portfolio away from it. Rebalancing restores the chosen mix by adjusting holdings. Investor.gov describes two broad approaches:
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- Threshold review: Check when an allocation moves beyond a preset percentage or range from its target.
The SEC notes rebalancing tends to work best relatively infrequently. Its guidance does not establish one schedule or threshold as optimal for everyone. Choose a process suited to your circumstances and account for any costs or tax consequences of transactions. Rebalancing manages allocation drift; it cannot ensure a profit or prevent loss.
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