A stock index reaching a record high is not, by itself, a reason to buy more stocks or sell them. Build your portfolio around your goal, time horizon and ability to tolerate losses; diversify across and within asset categories; then rebalance when market movements push your investments away from your chosen mix. The title’s market premise is conditional: the sources cited here do not establish whether indexes are at record highs today.
Should you change your investments when the stock market is at a record high?
Not solely because of the record. A recent rise does not tell you whether stocks will rise or fall next, and it does not determine how much risk your plan can afford. The SEC’s beginner’s guide to asset allocation says savvy investors typically do not change their allocation based on the relative performance of asset categories—for example, increasing stocks because the market is hot. Instead, they may rebalance if market gains have moved the portfolio away from its target.
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First set or revisit the allocation that fits your circumstances. Then check whether your actual holdings still match it. That separates a deliberate plan from a reaction to a headline.
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Asset allocation is the distribution of investments among categories such as stocks, bonds and cash. There is no universally best stock, bond and cash percentage in the sources cited here. The SEC’s asset allocation guide identifies your investment goal, time horizon and risk tolerance as relevant factors.
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- Goal: Identify what the money is for and when you expect to need it.
- Time horizon: A nearer-term goal may call for less volatility than a distant one, all else equal, because there is less time to ride out declines before using the money.
- Risk tolerance: Consider whether you could stay with the plan through a substantial loss, rather than choosing a stock-heavy mix only because markets have recently risen.
These factors work together; a portfolio suitable for one person or goal may be unsuitable for another. The SEC guide’s example of a stock allocation rising from 60% to 80% illustrates how market movement can cause drift—it is not a recommended allocation or a forecast.
Diversify across investments, not just account labels
A diversified portfolio spreads exposure across asset categories and across investments within each category. A mutual fund or ETF can make it easier to own portions of many investments, but the fund label alone does not prove that your overall portfolio is diversified.
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Check what each fund actually holds
A narrow sector fund may concentrate holdings in one part of the market. Multiple funds can also own many of the same largest companies, leaving you with more exposure to those companies than the fund count suggests. Review fund holdings and overlap, and consider what each position adds to the portfolio. The SEC’s beginner’s guide explains why fund ownership does not automatically eliminate concentration.
Look across categories and within them
Stocks, bonds and cash have different roles and risks; diversification also means avoiding dependence on only one issuer, sector or narrow slice of a category. Choose the mix to serve your goal rather than trying to predict which category will lead next.
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Rebalance when your portfolio drifts
As markets move, an asset category that performs well can take up a larger share of your portfolio than intended. The SEC’s glossary defines rebalancing simply: “Rebalancing brings a portfolio back to its original asset allocation mix.” Rebalancing is a way to restore the risk mix you chose, not a guarantee of better returns.
Ways to bring holdings back toward target
- Direct cash flows: Put new contributions or available cash toward categories that are below target, if appropriate.
- Buy underweights: Add to categories below target rather than selling investments that have grown.
- Sell overweights: Sell some of the categories that have grown beyond target, after considering potential taxes and transaction costs.
Using contributions or cash flows may avoid some sales, but whether it is practical depends on your circumstances. FINRA’s asset allocation and diversification guide and the SEC guide describe rebalancing methods and considerations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How often should you rebalance?
There is no official timeline that fits every investor. FINRA identifies an annual review as one possible consideration; the SEC describes checking at six- or twelve-month intervals or using preset thresholds for allocation drift. The SEC also says rebalancing tends to work best relatively infrequently. These are possible approaches, not a requirement to trade on a fixed schedule.
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You can choose a calendar review, a threshold that prompts action when an allocation moves beyond a range, or a combination. Whichever method you use, compare the current mix with your target and consider transaction fees and tax consequences before selling. Review the approach in light of your goal and circumstances rather than changing it because an index made a new high.
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What diversification can—and cannot—do
Diversification can reduce concentration risk, but it cannot guarantee a positive return or protect a portfolio from losses during a market decline. Different asset categories and investments may fall at the same time. The SEC explains this limitation in “Diversify Your Investments.”
This is educational information, not individualized investment or tax advice. Market levels, tax rules and investment products can change; the cited sources do not provide a present-day index reading or a market-performance forecast.
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