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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsDo not let a seasonal pattern decide your portfolio’s core allocation. Set an allocation around your goals, time horizon and tolerance for risk first; then check your holdings for sector concentration and overlap, and rebalance if they have drifted from that plan. Historical seasonality can inform questions, but it is not a reliable forecast or a personalized buy signal.
Start with your goal, time horizon and risk tolerance
Choose an asset mix to fit what you are investing for, when you expect to need the money and how much risk you can accept. Those considerations should lead the decision—not which sectors recently appear strong in particular months. There is no universal stock-and-bond split that fits every investor.
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The SEC’s asset-allocation guidance explains how time horizon and risk tolerance shape the mix of investments. Use your chosen allocation as the reference point for evaluating any sector position.
Check diversification across asset classes and within stocks
Diversification has two dimensions: spreading investments across asset categories and spreading the investments within each category. Within equities, that includes exposure to different companies and industry sectors. A portfolio can hold several investments yet remain concentrated if much of its value depends on the same sector or a small group of companies.
A fund’s label alone does not establish that it is broadly diversified. A sector ETF or mutual fund may focus on a narrow slice of the market, and multiple funds can own many of the same securities. Look through fund holdings and consider each position alongside the rest of the portfolio. The SEC’s guide to asset allocation, diversification and rebalancing discusses both the convenience of pooled funds and the concentration risk of sector-focused funds.
- Review the portfolio by asset class and by sector, rather than counting funds or securities.
- Inspect fund holdings for repeated companies and overlapping sector exposure.
- Compare actual exposures with the allocation you chose for your goals and risk tolerance.
Use seasonality as context, not a trading instruction
A 2024 study by Abbas Valadkhani and Barry O’Mahony, published in the International Review of Financial Analysis, examined U.S. sector ETFs and the S&P 500 using monthly data from January 1999 through December 2023. It reported that eight of nine sector ETFs consistently had positive returns in April and/or November and/or December across the study’s two sample periods. For March, May, June, August, September and October, the study found no statistically significant positive or negative calendar-month anomaly for the ten ETFs it examined: nine sector ETFs plus SPY.
Those findings describe historical differences in the sample; they do not show that a sector will rise in a particular month now. The study does not establish that buying or overweighting a sector on that basis would produce dependable returns after fees, taxes or trading costs. Its results concern U.S. ETFs and the periods analyzed, so they should not be extended to other markets, periods or individual circumstances. Read the study abstract and publication details for its scope.
Rebalance when sector winners shift your mix
If a sector position has grown beyond the share you intended to hold, rebalancing can bring the portfolio back toward its chosen allocation. The SEC describes several ways to do that; which method makes sense depends on the investor and the circumstances.
- Trim and redirect: Sell some of an overweight holding and use the proceeds to add to underweight investments.
- Direct new contributions: Put new money toward underweight areas instead of adding to the positions that have grown larger.
- Set a review rule: Check at chosen intervals or rebalance when an allocation moves beyond a preset band. A single schedule or threshold is not right for everyone.
The SEC and FINRA investor bulletin on year-end investment considerations describes rebalancing approaches. Consider the tax consequences of selling investments in taxable accounts before making changes; the sources cited here do not determine what is suitable for an individual’s tax situation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Know what diversification can—and cannot—do
Diversification can reduce risk compared with holding an undiversified portfolio, but it cannot ensure that investments will avoid losses when markets fall. Investor.gov, the SEC’s investor-education site, puts it plainly: “Diversification can’t guarantee that your investments won’t suffer if the market drops.” See its page on diversifying investments.
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