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Start by checking what you own underneath the fund names. A broad index fund, a technology fund and individual stocks can all hold the same companies, leaving a portfolio more concentrated than it looks. Then decide which risks you want to reduce, choose an allocation that fits your goals and risk tolerance, and rebalance it using a deliberate process. Diversification can reduce the impact of a concentrated holding; it cannot eliminate investment risk.
Why a portfolio with many holdings can still be concentrated
Market-cap-weighted indexes give larger companies a larger share of the index. A fund that tracks one can hold many companies while still assigning substantial weight to a small number of its biggest positions. Owning several funds does not necessarily solve that problem if their holdings overlap.
In remarks dated November 20, 2025, SEC Commissioner Mark T. Uyeda said the top 10 companies in the S&P 500 accounted for nearly 40% of the index’s total market capitalization. That is a dated figure from those remarks, not a current 2026 reading of the index. It illustrates why the weighting method matters; check current index and fund holdings before drawing conclusions about today’s concentration.
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How to audit your total exposure
- List all your accounts and holdings. Include workplace retirement plans, IRAs, taxable accounts, individual stocks and employer shares. Include cash and bonds too, so the picture covers more than equities.
- Look through each fund. Check its current holdings and, where available, its sector, company-size and geographic breakdown. Compare underlying positions across funds instead of counting fund names.
- Estimate repeated exposure. Note companies held directly and through multiple funds. Where holdings and values are available, consider each company’s share of your overall portfolio rather than treating each appearance as a separate holding.
- Check more than sector labels. Map exposure by asset class, company size and geography. For bonds, consider issuer, maturity and credit quality as well. A portfolio can be spread across sectors but still concentrated in large companies, one country or one type of asset.
- Record what you cannot see. If a plan or fund does not provide enough detail to assess its underlying exposure, mark that uncertainty rather than assuming it adds diversification.
FINRA cautions that “Simply holding only funds doesn’t shield you from concentration risk.” The relevant question is what the funds own and how those holdings combine with the rest of your accounts.
Decide which risk you want to reduce
Before changing investments, identify the problem you are trying to solve. You might want less reliance on a few large companies, more exposure outside one country, or a different balance between stocks and bonds. Those are different goals and may call for different changes.
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Allocation is personal: the SEC’s investor guidance ties it to financial goals and risk tolerance. Your time horizon, ability to bear losses, account type, tax situation and liquidity needs also affect what may fit. Moving away from large U.S. companies does not automatically lower overall risk; alternative holdings have risks, costs and liquidity characteristics of their own.
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Compare diversification choices by what they actually add
Use these questions to evaluate an existing holding or a possible change. A label such as “international,” “equal weight” or “bond” describes a category, not a guarantee that the investment will offset the risks already in your portfolio.
| Dimension | What to check | Why it matters |
|---|---|---|
| Breadth and overlap | Range of companies, sectors and countries; largest positions; repeated holdings across your investments | A long security list can still leave a few positions with a large combined role. |
| Asset-class role | Whether the holding adds stocks, bonds, cash or another type of investment | Different asset classes have different risks; adding another stock fund may not change an equity-heavy allocation. |
| Company size and geography | Exposure to large, medium or small companies and to domestic or international markets | This shows whether your exposure is concentrated in a particular market segment or region. |
| Bond characteristics | Issuers, maturities and credit quality | A bond holding is not a single uniform risk category. |
| Costs, liquidity and taxes | Fund and trading costs, how readily an investment can be sold, and the tax impact of selling | A change in exposure can bring costs or make money less accessible; selling in a taxable account may also have tax consequences. |
| Fit | Consistency with your goals, time horizon and willingness and ability to bear losses | A diversified holding still may not suit your plan. |
Broad index funds can offer exposure to many securities while retaining the index’s weighting method and risks. Equal-weight, smaller-company or international funds are possible comparison categories, not automatic fixes or recommendations. Look at their actual holdings, costs, liquidity and risks, including how they relate to what you already own. Bonds can add an asset class, but their issuer, maturity and credit quality matter.
The SEC also warns that a narrow fund is not automatically diversified and that adding investments can add fees. More holdings are useful only if they change the exposure in a way that fits your objective.
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Set a target and choose a rebalancing process
Once you have selected an allocation that fits your circumstances, use rebalancing to bring the portfolio back toward it when market movements or contributions cause holdings to drift. Rebalancing is a way to maintain an allocation, not a way to ensure a return.
Choose a review trigger
You can review on a calendar schedule or act when an allocation moves beyond thresholds you set in advance. FINRA says there is no official universal timeline and suggests investors may consider an annual review. Investor.gov describes six- or twelve-month intervals as examples some experts recommend, not a mandatory rule. Choose a process you can follow and review whether it still suits your circumstances.
Use contributions before selling, when appropriate
One option is to direct new contributions toward underweight areas or redirect future contributions. Another is to sell some overweight holdings and buy underweight ones. Selling can involve transaction charges or taxable gains, so consider the account and tax consequences before acting.
Why private investments are not a simple diversification fix
Private investments may broaden the range of assets available, but they are not necessary for every investor and should not be treated as a straightforward answer to concentrated public-market holdings. SEC Commissioner Uyeda’s November 20, 2025 remarks also noted illiquidity and valuation concerns. Before considering them, understand access, fees, oversight, how valuations are determined and when you could get your money back.
When individualized advice may help
If you are unsure how your accounts fit together or how to account for taxes, employer shares or liquidity needs, consider speaking with a qualified financial professional. The SEC advises investors to check a professional’s credentials and disciplinary history. General diversification guidance cannot determine a suitable allocation for an individual investor.
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