The fourth quarter can shape how investors remember a market year: a late rally may lift annual returns, while a sharp decline can erase months of gains. Historical patterns offer context, but they do not tell investors what markets will do next.
According to Mark Hulbert’s analysis for MarketWatch, large-cap stocks have tended to gain relative strength against small caps as year-end approaches. Understanding the forces behind that pattern can help investors weigh market performance without treating seasonality as a forecast.
Key factors:
- Historical fourth-quarter strength, not a guarantee of future gains
- Year-end incentives that can influence professional portfolio choices
- Interest rates and uncertainty as continuing market-performance pressures
- Risk-aware decisions grounded in goals, diversification, and time horizon
Why the fourth quarter can influence annual market performance
That historical pattern gives the calendar quarter a larger role in investor expectations, although results still depend on conditions in each year. A strong year-end rally can materially lift annual returns after weaker earlier months.
Seasonality offers context, not a promise
According to Hulbert, the S&P 500 has historically posted positive fourth-quarter returns close to 80 percent of the time, with an average gain around 4 percent. Those figures describe a long-run historical tendency, not a reliable outcome for any particular year.
Different studies can report different averages because they may use distinct periods, indexes, or calculation methods. For investors, the practical point is not to expect a fixed gain, but to recognize that market performance often improves late in the calendar year.
Historical performance at a glance:
| Measure | Historical pattern described |
|---|---|
| Quarter | Fourth quarter has been a relatively strong period for U.S. stocks |
| Frequency | S&P 500 positive in close to 80 percent of fourth quarters |
| Average gain | Approximately 4 percent in the cited long-run analysis |
| Limitation | Historical averages cannot predict an individual year’s result |
Late-year trading has its own conditions
The calendar effect overlaps with earnings season, when companies report results and investors reassess expectations. Holiday trading can also bring thinner activity at certain times, so individual market moves may not reflect a broad change in economic outlook.
Investor sentiment can shift quickly when inflation, interest rates, or company guidance surprise markets. The fourth quarter matters partly because these influences arrive together, not because the calendar itself guarantees a rally.
Seasonal signals are most useful when placed beside the economic and corporate news shaping the market’s current direction.
Why large caps may gain relative strength near year-end
Once seasonal returns are separated from market-wide drivers, another pattern comes into view: large companies have tended to outperform smaller ones late in the year. That relative shift can matter even when the overall market is flat.
Benchmark incentives can shape portfolio rebalancing
Hulbert points to research by finance professors Lucy Ackert and George Athanassakos, whose study examined institutional incentives and the January anomaly. Their work found that managers may favor riskier small-cap stocks early in the year, then reduce exposure as year-end approaches.
A manager already ahead of the S&P 500 may have an incentive to protect that lead by moving toward large companies that dominate the benchmark. This behavior, often described as window dressing, can contribute to portfolio rebalancing and stronger relative demand for large caps.
Potential year-end influences:
- Benchmark-relative compensation and performance targets
- Portfolio shifts toward familiar large-cap index constituents
- Interest-rate changes affecting smaller firms more sharply
- Economic uncertainty weighing on risk-sensitive stocks
Interest rates and uncertainty still matter
Seasonality is not the only explanation for large-cap strength. Hulbert notes that rising Treasury yields and greater economic-policy uncertainty have historically been associated with weaker relative results for small-cap stocks.
That relationship is not a rule for every company or quarter. Smaller businesses differ widely in debt levels, customer demand, and access to financing, so investors should avoid treating market-cap size as a substitute for examining fundamentals.
| Factor | Possible market implication |
|---|---|
| Higher long-term yields | Can pressure smaller companies’ relative performance |
| Economic-policy uncertainty | May reduce appetite for risk-sensitive shares |
| Benchmark incentives | Can encourage managers to protect relative gains |
| Company fundamentals | Remain essential to assessing individual stocks |
The relative case for large caps therefore rests on both seasonal behavior and broader financial conditions, which makes risk management the next consideration.
How investors can use fourth-quarter market history
Because historical patterns are only one input, investors can use them to frame questions rather than dictate trades. A disciplined approach starts with the purpose of the portfolio and the risks its owner can tolerate.
Keep the time horizon ahead of the calendar
An investor saving for a goal years away may have little reason to reshape a diversified portfolio solely because the fourth quarter has often been strong. Someone facing a near-term withdrawal, however, may need to review cash reserves and exposure to market volatility.
According to the research summarized by Hulbert, the large-cap tendency persisted after accounting for interest rates and economic uncertainty. That finding strengthens the historical observation, but it does not remove the possibility of losses or guarantee that the pattern will recur.
Practical checks before changing allocations:
- Compare current holdings with the portfolio’s intended risk level
- Review concentration in individual companies and market sectors
- Consider taxes, trading costs, and near-term cash needs
- Use seasonality as context rather than a standalone signal
Choose exposure without chasing a year-end rally
Investors seeking broad large-cap exposure can research funds tracking indexes such as the S&P 500 or Russell Top 200. These vehicles differ in holdings, fees, and construction, so comparing their official fund documents matters more than choosing by a seasonal headline.
Stock selection requires still more care: market capitalization alone says little about valuation, balance-sheet strength, or future earnings. A year-end rally may reward patience, but a sound plan should also remain workable if prices fall instead.
Seasonality can sharpen an investor’s questions; a diversified plan and clear time horizon should determine the answers.
For context on portfolio construction, broad diversification can help separate an investment plan from short-term market swings. Investors should evaluate their own circumstances before acting on historical patterns.
Source: Mark Hulbert, “Large caps tend to outperform small caps as year’s end approaches,” MarketWatch, September 10, 2026.
