Speculation, momentum, and the challenge for active investors

Momentum and speculative trading have made the equity market a tougher environment for disciplined active investors, but the recent weakness of quality is more likely cyclical than permanent.

• As of June 2026, high-frequency trading and market-making represented roughly 40–50% of trading volume, quantitative funds 20%, and fundamental investors only 10–20%.
• Retail investors accounted for approximately 21% of U.S. trading volume, up from about 10% in 2010, while zero-commission platforms, mobile access, and options trading have increased speculative activity.
• Sentiment, positioning, and momentum are increasingly influencing short-term prices, allowing high-quality companies outside favored themes to underperform and creating tracking error for long-only investors.
• AI-linked leaders, high beta, and speculative stocks have recently weakened the quality factor, although the authors argue that quality has historically delivered long-term outperformance and downside resilience across full market cycles.
• Active management faced an unusually difficult 2025: it was the fourth-worst year in 25 years for relative performance, and Morningstar found that only 38% of active managers beat their average asset-weighted benchmark.

Takeaway: Investors should not abandon quality and risk discipline to chase concentrated momentum; greater flexibility may be needed while maintaining diversification, valuation discipline, and patience until market leadership broadens.