U.S. tech valuations stir bubble concerns in stock market

Traders Union
All News
Financial News
US tech valuations bubble concerns

Highlights

BofA Global Research's Bubble Risk Indicator signals elevated risk at 0.91 for PHLX Semiconductor Sector and 0.82 for Technology Select Sector, near the extreme threshold of 1.
The Buffett Indicator stands at 218% for Q1, just below last quarter’s 219% record, while the S&P 500 price-to-sales ratio is 3.22 versus the historical average of 1.84.
Despite a narrowing S&P 500 versus equal-weight index gap from 14 to 3 percentage points, strategists emphasize caution as market breadth broadens but high-margin growth is still priced in.

Valuation signals point to mounting risk

As reported by Reuters, several market indicators are reinforcing concerns that parts of the U.S. equity market are showing bubble-like characteristics, especially in technology and semiconductor stocks. Investors are weighing whether years of strong gains tied to artificial intelligence enthusiasm are pushing valuations beyond levels that earnings can sustainably justify.

BofA Global Research's Bubble Risk Indicator stands at 0.91 for the PHLX Semiconductor Sector and 0.82 for the Technology Select Sector, on a scale where 1 signals extreme bubble-like price action. The Buffett Indicator, which compares total U.S. stock market capitalization with gross domestic product, stands at 218% in the first quarter, just below the prior quarter's record 219%.

The S&P 500 price-to-sales ratio is currently 3.22, according to Tajinder Dhillon, head of earnings research at LSEG, well above its long-term average of 1.84. While the index's price-to-earnings ratio is 20.2 times expected 12-month earnings, below the 25.2 seen during the dotcom bubble, some investors argue even current earnings assumptions may prove too optimistic.

Sentiment remains supportive, but caution persists

Last week's sharp decline in technology stocks, driven by concerns over debt-funded AI spending and a hawkish Federal Reserve, deepened investor anxiety even as the broader market steadies. Some investors still see support from improving sentiment, broader participation in the rally and solid corporate earnings.

Sentiment indicators are mixed rather than euphoric. BofA's June global fund manager survey shows investors remain bullish, though less so than in May, while the latest AAII Sentiment Survey shows the bull-bear spread rising to 8.8%, above its historical average of 6.5% but still well below past extremes.

Investors are also watching whether market leadership continues to broaden. After reaching about 14 percentage points in early 2026, the gap between the S&P 500 and its equal-weight version has narrowed to roughly 3 points in recent sessions, suggesting the rally is no longer as concentrated. Even so, strategists say diversification remains prudent as markets continue to price in high margins and strong growth.

In our earlier report on the Magnificent Seven selloff, we covered how rising interest rates and a turn in investor sentiment wiped about $2.3 trillion from the group’s market value. We also noted that the pullback was fueling concerns about stretched growth expectations and how reliant the broader U.S. stock market has become on a narrow set of mega-cap technology leaders.

This material may contain third-party opinions, none of the data and information on this webpage constitutes investment advice according to our Disclaimer. While we adhere to strict Editorial Integrity, this post may contain references to products from our partners.