The S&P 500’s record-setting rally is masking deep internal cracks, with market breadth falling to lows last seen during the dot-com bubble, according to a new report from Goldman Sachs.
"The hot jobs number takes March off the table for cuts,” said Ben Snider, chief U.S. equity strategist at Goldman Sachs, in a note to clients. He warned that the gains are dangerously concentrated in a handful of mega-cap technology stocks, creating a crowded trade that is vulnerable to a sharp reversal.
The firm’s prime brokerage data shows that hedge fund net exposure to momentum as a factor is approaching multi-year highs. Four of the last five record highs for the S&P 500 have occurred on “negative breadth” days, where the number of declining stocks outnumbered advancers. This divergence shows a stark disconnect between the index’s performance and the health of its underlying constituents.
The risk is that a reversal in the handful of leading stocks could trigger a rapid and severe market-wide correction. With so much capital concentrated in the same names, a rush for the exits would not be absorbed by other sectors, potentially leading to a cascade of forced selling from deleveraging hedge funds. The current market structure points to either a broadening of the rally to include lagging stocks or a pullback in the leaders, with both paths suggesting a significant increase in volatility.
The core of the issue is the market’s singular focus on artificial intelligence. The rally has been almost exclusively centered on companies building AI infrastructure, while the broader economic benefits of AI have not yet been priced in. As AI adoption diffuses through the economy, a wider range of companies may emerge as beneficiaries, which could help restore market breadth.
However, Goldman Sachs cautions that this process will be gradual. Before a healthier, broader market rally can occur, the current period of narrow concentration may need to unwind. The report suggests that the longer this dynamic persists, the greater the risk of a disorderly and painful correction for investors who are crowded into the same few momentum stocks.
This article is for informational purposes only and does not constitute investment advice.
