Small Caps and Value Stocks Lead Gains as S&P 500 Advances

• S&P 500 rises amid rare sector rotation seen in only 5% of up weeks since 2000.

• Healthcare boosted defensives Friday; value, small caps rose with Treasury yields post-CPI report.

Last week, the S&P 500 continued its upward momentum despite notable shifts in market leadership. Small-cap stocks outperformed their large-cap counterparts, value stocks surpassed growth sectors, and cyclical industries outshone defensive ones.

According to Capital Economics, such a rotation pattern appears in roughly 13% of weeks since 2000 but is considerably rarer—occurring in only about 5% of weeks—when the overall market is rising. This marks just the second instance this year when all three rotation trends have aligned alongside a broader market advance.

Some investors have drawn comparisons to the late dotcom bubble period, when similar movements from large to small caps occurred even as markets climbed. Historical evidence suggests that this pattern has often preceded market declines in recent years.

Capital Economics highlights that the recent outperformance of defensive stocks was primarily driven by a unique surge in healthcare shares on Friday.

Before this boost, the MSCI USA Defensive Sectors Index had lagged behind cyclical sectors, with Consumer Staples and Utilities ending the week as the weakest performers within the S&P 500. The surge in value and small-cap stocks was concentrated around August 12 and 13, coinciding with a rise in short-term Treasury yields following the July U.S. CPI report.

Typically, lower yields tend to benefit small caps compared to large caps, as smaller companies are generally more sensitive to domestic credit conditions. Despite parallels drawn to 1999’s market environment, Capital Economics does not find the recent shifts alarming and states it has "yet to see a compelling reason to think a market rotation—or worse, major downturn—lies in store."