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Start with your entire portfolio
Before adding investments, take stock of what you already own across accounts, including workplace retirement plans, IRAs, and taxable accounts. Look through funds to their underlying holdings: exposure to one company may be spread across several funds, even if no single fund appears large in isolation.
- Identify how much of your stock exposure is tied to any one company.
- Look for concentration in a single industry or in related industries.
- Compare funds’ strategies and top holdings to spot overlap.
- Note exposure by company size and geographic market, not just the number of investments.
The SEC’s asset allocation and diversification guide advises checking fund top holdings because narrowly focused funds can leave investors concentrated. FINRA also cautions that two funds in the same stock subclass may not diversify each other.
Diversify the stock portion across several dimensions
Within the stock allocation, consider whether your holdings represent different issuers, sectors, company sizes, and geographic markets. These dimensions address different kinds of concentration: owning many companies in one industry, for example, still leaves the portfolio exposed to conditions affecting that industry.
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- Companies: Avoid relying heavily on a single issuer.
- Sectors: Spread exposure beyond one industry rather than treating several companies in the same sector as broad diversification.
- Company sizes: Consider whether exposure is limited to one size category.
- Geography: Check whether holdings are concentrated in one country or market.
There is no universally correct number of stocks or fixed percentage of risk removed by diversification. The appropriate breadth depends on the portfolio and the investor’s circumstances.
Use funds carefully, and check what they own
Mutual funds and exchange-traded funds (ETFs) can pool investments across companies or sectors, but a fund’s label does not establish how diversified it is. Some funds focus narrowly, and some ETFs track a single stock. A sector fund may add exposure to one industry rather than broaden it.
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For each fund, review its strategy, top holdings, concentration, expenses, and how it fits with the rest of your portfolio. When comparing funds, consider the number and variety of issuers, sector and geographic concentration, overlap with existing holdings, fees, and whether the fund adds a distinct exposure. Owning more funds by itself does not necessarily create more diversification. The SEC’s April 29, 2025 investor bulletin on mutual funds and ETFs explains both the potential diversification benefit and these limitations.
Set asset allocation separately from stock diversification
Diversifying within stocks is different from deciding how much of the portfolio belongs in stocks, bonds, and cash. That overall asset allocation should reflect the goal, the time horizon for needing the money, and both your willingness and ability to tolerate losses. A longer horizon does not remove risk, and a conservative mix does not eliminate it.
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Consider whether a target-date fund fits
A target-date fund offers a one-fund structure that holds a mix of investments and changes its allocation over time, typically in relation to a target year such as a planned retirement year. Compare its investment mix and risk level with your objectives, tolerance for losses, and other investments. The target year alone does not guarantee that the fund’s allocation or outcome will suit you. See the SEC’s March 25, 2025 target-date fund bulletin.
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Choose a review and rebalancing method
Market movements can shift a portfolio away from its intended asset allocation. Rebalancing means restoring that chosen mix, for example by adjusting holdings. The SEC describes calendar-based reviews, such as every six or 12 months, and threshold-based approaches that trigger a review after an allocation moves beyond a set level. These are examples, not a universal schedule; the SEC says rebalancing tends to work best relatively infrequently. Choose a method you can follow and review the allocation against your goal rather than reacting to every market move.
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