If a few large technology stocks dominate your investments, start by measuring your exposure across every account—not by buying another fund at random. Inventory direct shares, employer stock, retirement and taxable accounts, and the holdings inside your funds. Then choose a target mix that fits your goals, time horizon, and ability and willingness to withstand losses. Diversification can reduce dependence on a small number of holdings, but it cannot prevent losses.
What is asset allocation?
Asset allocation is how you divide investments among broad asset classes, such as stocks, bonds, and cash. The appropriate mix depends on your goals, time horizon, and risk tolerance; there is no universally suitable stock, bond, and cash split. The SEC explains the basic framework in its Asset Allocation and Diversification guide.
For someone whose wealth is tied to a few tech companies, allocation is more than a choice between “stocks” and “bonds.” Your stock exposure may be concentrated in particular issuers or sectors even if you own several funds. Your first task is to see the whole portfolio in one view.
How do I diversify my investments?
1. Inventory every account and investment
List holdings across brokerage and taxable accounts, workplace retirement plans, individual retirement accounts, and any other investment accounts. Include cash and bonds as well as stocks. Record employer equity separately, including shares already held and any awards or options that could add exposure as they vest or are exercised.
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Then look through each mutual fund and ETF to identify its underlying holdings. Note repeated companies, sectors, and—where the fund reports them—countries. A fund’s name or the number of positions it owns does not by itself tell you how much exposure it adds: two funds may own many of the same large companies.
2. Read your exposure in layers
- Single-company exposure: Estimate how much of your overall portfolio depends on each large holding, including employer stock.
- Sector and related-company exposure: Identify how much remains tied to technology or to companies whose fortunes may be connected. Owning several companies is not necessarily broad diversification if they share similar risks.
- Domestic and international stocks: Check whether your stock holdings are spread across markets and countries, rather than concentrated in one market.
- Stocks, bonds, and cash: See how much is in each asset class. These categories have different characteristics, but none is guaranteed to offset losses in another.
This layered view distinguishes owning more tickers from actually spreading risk. Diversification can occur both across asset classes and within an asset class, including across companies and sectors.
3. Set a destination before trading
Decide what allocation you are aiming for before selling or buying. The choice should reflect when you expect to need the money, what the investments are for, and how much loss you could financially and emotionally tolerate. A long time horizon does not make a concentrated position safe, and a lower-risk allocation is not automatically right for every investor.
This is a personal decision, not a universal formula. If employer equity, account restrictions, or the consequences of selling make your target difficult to choose or implement, consider individualized guidance from a qualified financial professional.
4. Compare funds by what they own and how they are built
Funds and ETFs can provide access to many investments in one holding, but neither label guarantees diversification. A narrow sector fund may add more of the concentration you are trying to reduce. Before choosing a fund, compare:
- Underlying holdings and overlap: Check the largest positions and how they duplicate stocks you already own.
- Sector and country exposure: Determine whether the fund broadens your exposure or reinforces an existing concentration.
- Index rules and weighting: Find out what the fund tracks and how positions are weighted. In a market-cap-weighted index, companies with larger market capitalizations receive larger weights. A broad index fund can therefore still hold substantial exposure to the largest companies.
- Role in your allocation: Confirm whether the fund is intended to provide domestic or international stocks, bonds, or another defined part of your plan.
- Costs and risks: Review expenses and the fund’s stated risks. Index funds can have expenses and tracking error; ETFs also have market-price risks.
The SEC’s ETF bulletin describes how ETFs pool investments and discusses risks associated with their structure and market prices. Its Index Funds bulletin, published August 6, 2018, explains index construction, market-cap weighting, expenses, tracking error, and index-fund risks. Check current holdings, fees, and fund documents when making a decision; they can change.
5. Choose how to move toward the target
You can direct new contributions toward underweighted parts of your portfolio, or sell some holdings and buy others. Using contributions may help change the mix without selling appreciated assets, but whether it is enough depends on the size of the imbalance and the amount you contribute. Sales can have tax consequences that depend on your account and jurisdiction; get advice specific to your circumstances rather than assuming a general rule applies.
Rebalancing means restoring your portfolio to a chosen allocation when market movements or contributions shift it. Two common approaches are:
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- Threshold-based: Rebalance when an allocation moves beyond a preset range or percentage-point limit you selected in advance.
The SEC says rebalancing generally works best relatively infrequently. A plan with clear rules can help avoid reacting to every market move; choose an approach you can follow and account for trading costs and applicable taxes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How often should I review a concentrated portfolio?
Review your full holdings at a cadence you can sustain, and revisit the target when your goals, time horizon, finances, or ability to tolerate losses change. Between reviews, check major changes such as new employer-stock awards or fund changes that could alter your exposure. Avoid turning routine monitoring into constant trading.
Diversification is a way to spread exposure, not a promise of safety. Investor.gov puts the limit plainly: “Diversification can’t guarantee that your investments won’t suffer if the market drops.” See its Diversify Your Investments page.
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