Stocks Have Had a Big 2025. Should You Buy Into the 'Most Wonderful Time' of the Year?

U.S. equities are anticipated to experience a strong fourth quarter, historically the best-performing period, following a robust year-to-date performance with the S&P 500 up nearly 14%. Analysts from Bank of America and Goldman Sachs project continued gains, citing a strong historical seasonal bias—Q4 has seen gains in 89-90% of instances after strong first nine months—and a 'Goldilocks backdrop' driven by earnings momentum, AI growth, and potential rate cuts, though energy and real estate sectors may diverge from this trend.

Analysis

Following a robust year-to-date gain of nearly 14% for the S&P 500, including an uncharacteristically strong 3.5% rise in September, historical data and analyst sentiment signal a potentially strong fourth quarter. Historical precedent is compelling: over the past 76 years, a positive performance in the first nine months has led to Q4 gains approximately 89% of the time, a figure that LPL Financial notes exceeds 90% when September also sets record highs. Bank of America corroborates this seasonal strength, identifying Q4 as historically the best quarter for stocks with an average return of 2.9% since 1928, though it cautions that gains are often back-loaded into November and December, and that energy and real estate may not participate in the broad rally. This bullish outlook is further supported by fundamental drivers, with Goldman Sachs advising clients to "buy dips" based on a "Goldilocks backdrop" of stable growth and anchored inflation. Similarly, LPL's chief strategist points to earnings momentum, a potential rate-cutting cycle, and the secular growth trend in Artificial Intelligence as key catalysts that have already propelled stocks through seasonal headwinds.

Key Decisions for Investors

• Given the strong historical precedent and bullish analyst consensus, consider maintaining or increasing exposure to U.S. equities, potentially using any near-term volatility in October to accumulate positions ahead of an anticipated year-end rally.
• Investors should review sector allocations, as Bank of America highlights a bullish seasonal bias across most sectors except for energy and real estate, suggesting a potential rotation or underweighting of these two specific areas.
• Monitor key macroeconomic indicators for any deviation from the 'Goldilocks' scenario of moderate growth and anchored inflation, as this backdrop is a critical assumption underpinning the positive outlook from Goldman Sachs and LPL Financial.
• While the catalysts of AI-driven growth and earnings momentum are strong, be mindful that Q4 gains are historically dependent on outperformance in November and December, implying patience may be required through a potentially slower October.