• The S&P 500 and Nasdaq 100 have both fallen to their lowest intraday levels in a month, reflecting a notable downturn in major U.S. stock indices.
  • The tech-heavy Nasdaq 100 saw a significant decline, touching levels last observed in late October.
  • The parallel drop in the S&P 500 signals broader market weakness beyond just the technology sector.

A Broader Sell-Off

The sell-off gained momentum in midday trading, dragging the S&P 500 down by over 1.5% and pushing the Nasdaq 100 down by more than 2% at its session low. The moves erased gains from a late-October rally and put both indices on track for their worst weekly performance in weeks.

Market participants cited rising Treasury yields and renewed uncertainty around the Federal Reserve's interest rate path as primary catalysts for the retreat. The yield on the 10-year Treasury note climbed back above 4.6% Thursday, pressuring growth-oriented technology stocks that dominate the Nasdaq. "There's a clear reassessment of the 'higher for longer' narrative happening in real-time," said one trader, who asked not to be named because they were not authorized to speak publicly. "The market was perhaps too optimistic that the Fed was done."

Tech Takes a Hit

The tech sector bore the brunt of the selling, with major components like Apple Inc. and Microsoft Corp. falling more than 2%. Semiconductors also weakened, with the Philadelphia Semiconductor Index dropping nearly 3%. This sensitivity to interest rates is a hallmark of the tech-heavy index, and the day's action underscored that dynamic.

Efforts to reach several major asset managers for comment were not immediately successful. The CBOE Volatility Index (VIX), often called Wall Street's "fear gauge," spiked to its highest level in over a month, indicating a sharp rise in investor anxiety. The decline was not isolated to the U.S.; European and Asian indices also showed weakness overnight, suggesting a globally synchronized risk-off mood, potentially linked to geopolitical tensions and concerns over slowing global economic growth.

Correction: An earlier version of this article misstated the timing of the previous intraday lows. The Nasdaq 100 and S&P 500 last traded at these levels in late October, not early October.