The accompanying chart overlays the Invesco S&P 500 Equal Weight ETF (Purple) against the State Street SPDR S&P 500 ETF Trust (Blue). As of Q1 2026, a definitive performance gap persists year-to-date. Notably, this divergence reached a peak earlier in the period, with the largest YTD performance gap widening to over 600 basis points in February. Throughout the period, the Equal Weight index has consistently outperformed its Market Cap-weighted counterpart, signaling a structural shift in market leadership. In recent years, AWAIM's ACGM Total Portfolio Suite™ has preferred to express its exposure to the S&P 500 Index through an equal-weight index.
Emerging Regime Shift Toward Equal Weight
Historical patterns reveal that periods of extreme mega-cap concentration have consistently preceded a gradual shift favoring broader market exposure. The rolling 3-year cumulative excess return of the S&P 500 Equal Weighted versus the cap-weighted S&P 500 remained deeply negative for several years before beginning to reverse direction and showing initial signs of recovery in early 2026. In addition, the shorter-term rolling 6-month excess returns have recently turned sharply positive, indicating the early stages of a clear regime shift from cap-weighted dominance to equal-weighted leadership that delivers more balanced exposure across the S&P 500.
Two Paths to Equal-Weight Outperformance
The mechanics determining relative performance between cap-weighted and equal-weighted strategies hinge on the prevailing market regime. Two clear paths typically emerge:
Mega-Cap Concentration: This typically occurs when a small number of mega-cap stocks dominate index returns, creating significant concentration risk. In the current environment, the cap-weighted S&P 500 becomes highly sensitive to economic slowdown, earnings misses, or valuation compression among its largest constituents. As the "Magnificent 7" accounts for more than one-third of the index weighting, the entire cap-weighted S&P 500 remains fragile to any revaluation of these specific names.
Broad Market Rotation: This typically occurs when capital rotates away from a small number of mega-caps toward the broader S&P 500 universe, creating momentum favoring the equal-weight index. Under current circumstances, the equal-weighted S&P 500 becomes more resilient amid macroeconomic uncertainty as investors move away from the elevated valuation multiples of mega-caps and shift toward the remaining index constituents, where these stocks offer more reasonable valuations and greater earnings resilience.
The Current Regime: The 2026 Equal-Weight Resurgence
We may be currently witnessing the early stages of a market-led rotation away from narrow mega-cap concentration toward broader market participation. As of Q1 2026, the valuation gap between the cap-weighted and equal-weighted S&P 500 has widened dramatically. The cap-weighted index trades at stretched levels with a forward P/E around 25x and a record price-to-sales ratio above 3x, while the equal-weighted S&P 500 offers more reasonable valuations at approximately 20x forward P/E and below 2x price-to-sales.
Historically, there is a strong negative correlation between starting forward P/E levels and subsequent 10-year annualized returns. Elevated P/S ratios, in particular, have often reflected excessive optimism on revenue growth and preceded periods of valuation compression. While high valuations do not guarantee immediate correction, they have consistently been associated with below-average forward returns and an increased likelihood of a regime shift toward broader market participation in favor of equal-weighted strategies.
Strategic Positioning: Resilience Through Broader and More Balanced Exposure
In this environment of stretched valuations and an emerging leadership rotation, our strategy favors a more balanced exposure that demonstrates greater resilience amid market volatility. This approach delivers enhanced diversification, lower concentration risk, and access to the remaining index constituents at reasonably more attractive valuations.
References: AWAIM Research; Harbor Capital, The Current (April 2026); Alpine Macro, Alpine Macro Research (2026)