Over the past 12 months, the S&P 500 has risen by approximately 16%, a solid performance that, while modest next to some sector-specific surges, reflects steady growth across large-cap U.S. equities. Aggregate revenues for S&P 500 companies expanded by roughly 11% year-over-year, driven by strength in tech, health care and consumer discretionary names. Operating margins averaged near 27%, supported by continued cost discipline, while combined earnings per share climbed by about 14%. That steady improvement underpins the index’s resilience even as high-growth pockets elsewhere have far outpaced it.

The S&P 500 is positioned to record a fourth straight year of gains, a streak achieved only four times in the last century. Strategists highlight that forward price-to-earnings ratios are trading near historical averages of 18–20x, while equity risk premia sit close to long-term norms. However, market breadth has narrowed: just a handful of megacaps account for much of this year’s advance. Historical patterns suggest a mid-single-digit upside if economic growth remains stable and interest rates hold, but a broader rally likely requires participation beyond the top 10 contributors.