S&P 500 Momentum Index Plummets as Investors Pivot

The S&P 500 Momentum Index has fallen more than 9% since July 1, trailing the broader S&P 500's 2.8% gain. This decline follows a record 44% surge in the second quarter, placing the index on track for its worst quarterly underperformance in 25 years.

Investors shifted away from high-momentum AI-driven stocks, such as Nvidia and Micron Technology, toward previously shorted biotech shares. Moderna saw its share price rise approximately 150% this month following positive news regarding cancer vaccines, accelerating losses for momentum traders.

This volatility caused significant losses for systematic long-short managers, with Goldman Sachs Private Wealth Management reporting the worst day for these managers in over two years on August 19. The market shift contributed to the collapse of the hedge fund Situational Awareness, which had invested heavily in popular momentum chip stocks.

Data from the United States Commodity Futures Trading Commission indicates that speculators have increased net short positions in Nasdaq-100 futures to levels not seen in two decades, signaling a broad pivot away from technology-heavy momentum strategies.