American economist Peter Schiff has warned that deteriorating market breadth in the S&P 500 could point to rising downside risk for U.S. stocks, even as the benchmark index trades near record highs.

In an X post published on September 26, 2026, Schiff highlighted a widening divergence beneath the market's surface. While the S&P 500 sits just below its all-time high, hundreds of its constituent stocks remain far below their own peaks. According to Schiff, 430 companies in the index are trading an average of more than 21% below their highs, leaving roughly 86% of the index's stocks in bear-market territory.

That divergence matters well beyond trading desks. The S&P 500 is the most widely followed barometer of U.S. large-cap equities and the basis for many index funds and portfolios, and its market-cap weighting means a narrow rally can leave headline index strength coexisting with broad weakness among most of its members.

He laid out the figures in the post:

The S&P 500 is 0.7% below a record high, yet 430 of those stocks are 21.7% below their highs. That means on average 86% of the stocks are in a bear market. Breadth has only been this bad twice, in January 1973 and in 1999/2000. On both occasions, the S&P then crashed nearly 50% — Peter Schiff (@PeterSchiff) September 26, 2026

Schiff, a longtime gold advocate, argued that market narrowness of this magnitude has appeared only twice in recent history: in January 1973 and during the dot-com era between 1999 and 2000. Both episodes were followed by severe downturns in which the S&P 500 lost close to half its value. The 1973 signal preceded a prolonged bear market tied to economic stagnation and the oil crisis, while the 1999–2000 reading came just before the collapse of the technology bubble.

Big tech's grip on the S&P 500

Schiff's warning centers on S&P 500 breadth, a measure of how many stocks participate in a market rally. Strong breadth typically indicates that gains are distributed across a wide range of companies, while weak breadth suggests only a small number of names are powering index performance.

In the current market, mega-cap technology companies such as Nvidia (NASDAQ: NVDA) and Apple (NASDAQ: AAPL) account for a growing share of the S&P 500's market capitalization and have driven much of the index's recent advance. Because the index weights its members by market value, that concentration ties the benchmark's performance increasingly to the fortunes of a small group of companies.

The equal-weighted version of the S&P 500, which gives every constituent identical influence regardless of size, has underperformed the traditional capitalization-weighted index in recent weeks, a further sign of concentrated leadership.

Additional warning signs

Other indicators also point to weakening participation. The percentage of S&P 500 stocks trading above their 50-day and 200-day moving averages has declined, and many constituents remain more than 10% or even 20% below recent highs.

Some analysts have also cited rising Treasury yields and widening credit spreads as factors that could increase the risk of an S&P 500 correction if investor sentiment toward the market's leaders weakens. Taken together, these readings — moving-average participation, the gap between equal- and cap-weighted performance, Treasury yields, and credit spreads — give observers a concrete set of gauges to track as the debate over the rally's durability continues.

Schiff's latest comments are consistent with his long-standing concerns about elevated asset valuations, persistent inflation pressures, rising government debt, and the broader economic outlook. He has repeatedly argued that U.S. financial markets are vulnerable to a sharper downturn and continues to favor precious metals such as gold and silver as defensive assets.

Not all market observers, however, view the current breadth readings as evidence of an imminent crash. Some analysts contend that today's market differs from previous cycles owing to the growing influence of passive investing and the dominance of a small group of highly profitable technology companies.