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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Start by mapping what you own, including the underlying holdings of every fund. A broad market fund may still hold substantial megacap exposure, and several funds can own the same companies. Diversification means spreading investments across assets to reduce overall portfolio risk; the right mix depends on your goals, time horizon, and comfort with risk.
Find out where the concentration comes from
Concentration can come from owning one or a few individual stocks, from a heavy allocation to technology, or from funds whose largest holdings overlap. These are related but different problems: adding a fund does not necessarily reduce exposure if it holds many of the same companies.
Make a look-through inventory
- List each account’s individual stocks, funds, and other investments, along with their current values and weights in the portfolio.
- For each fund, review its objective, strategy, and latest holdings on the issuer’s website. Note the largest positions and how much of the fund they represent.
- Compare those holdings with your direct stock positions and with the holdings of your other funds. Combine repeated exposures to see how much of the portfolio depends on the same companies.
- Separate company concentration from sector concentration and from concentration in equities overall. This helps identify what kind of exposure, if any, you want to change.
Holdings and weights change, so use current issuer information rather than assuming a fund’s portfolio is static.
Understand why a broad market fund may not solve it
Many broad index funds weight companies by market capitalization, meaning larger companies receive larger weights. As a result, a fund that owns a wide range of stocks can still have significant exposure to the largest companies. The SEC’s Investor Bulletin on mutual funds and ETFs explains that funds differ in their objectives, strategies, risks, and holdings; the fund name alone is not enough to determine whether it diversifies your particular portfolio.
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Check the fund’s benchmark or investment strategy and inspect its holdings. A narrowly focused sector or industry fund may add a different set of positions, but it can also increase exposure to a limited slice of the market rather than broaden the portfolio meaningfully. The SEC’s ETF bulletin also notes that ETF shares trade on exchanges and their market prices can differ from net asset value (NAV).
Compare possible sources of diversification
There is no universally suitable allocation. The useful question is whether a potential investment adds exposure that fits your plan, rather than merely adding another ticker.
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| Option to evaluate | What to check | Key limitation |
|---|---|---|
| Broad-market equity fund | Index or strategy, underlying holdings, company weights, fees, and overlap with existing positions. | If market-cap weighted, it can retain substantial exposure to the largest companies. |
| Fund focused on other industries or regions | Its objective, holdings, geographic or industry scope, costs, and risks. | A focused fund may add exposure without providing broad diversification. |
| Bond allocation | Bond types, interest-rate and credit risks, costs, and fit with your goals and time horizon. | It changes the portfolio’s asset mix; whether that is suitable depends on your circumstances. |
| Another asset category | What drives its returns and risks, how it fits your plan, and whether its costs are acceptable. | A different label does not by itself establish that it will reduce your portfolio’s risk. |
For any fund, review its prospectus for fees, expenses, objective, and risks. Fees reduce returns, and an index fund can perform differently from its index because of costs and tracking error. The SEC discusses these mechanics in its guide to mutual funds and index-fund bulletin. Account for trading costs where relevant as well.
Use rebalancing to restore an intended mix
Rebalancing brings a portfolio back toward an allocation you have already chosen. The SEC describes three general approaches in its asset-allocation and diversification bulletin:
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- Sell some assets that have grown beyond their intended share and buy assets that are below theirs.
- Use new money to buy underweighted investments.
- Direct ongoing contributions toward underweighted categories.
Whether to sell a specific holding can depend on account and tax circumstances. These general methods do not determine the tax result or establish that selling is appropriate for any particular investor.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose an allocation that fits your situation
Diversification can occur within equities, across industries and regions, and across asset classes. The SEC defines it as “investing in a variety of assets to lower the overall risk of your investment portfolio” in Asset Allocation and Diversification. It does not eliminate investment risk or guarantee a gain.
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Before changing your portfolio, consider your goals, timeframe, and risk tolerance, along with the role of each holding in your overall plan. This information can help frame the decision, but it cannot determine a suitable allocation or a personal tax outcome.
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