GMO explores whether the rise of passive investing has meaningfully altered market behavior, focusing on efficiency, valuation distortions, and opportunities for active managers. While passive flows may have amplified mega-cap dominance and pressured value stocks, the authors argue the overall impact is smaller than feared and unlikely to override long-term market fundamentals.
The Passive Aggressive Agg, Revisited
GMO
Peter Chiappinelli
Research
8 Pages
Key Takeaways
Passive Impact Limited: Despite trillions in flows, passive investing effects are described as “quite small,” with no evidence it fundamentally changes long-term return math or market efficiency.
Mega Cap Distortion Risk: Passive flows may have contributed to mega-cap outperformance, while value and small caps lagged, potentially creating future return spreads of several percentage points.
Active Opportunity Set: With passive ownership rising above 50% in some markets, price-insensitive flows may create measurable mispricings that active managers can exploit over multi-year periods.
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