S&P 500 and NASDAQ Fall on Tech Sell-Off

The S&P 500 dropped 1.21% and the NASDAQ slid 2.60% as investors rotated away from mega-cap growth stocks.

Updated on Oct. 23, 2026 in Stock Markets

S&P 500 and NASDAQ Fall on Tech Sell-Off

Live Poll

Does recent volatility in tech stocks make you less confident about the market's direction?

The S&P 500 and NASDAQ recorded their largest daily declines in several months on October 22, 2026. Semiconductor and AI-exposed stocks faced significant selling pressure, prompting a rotation into defensive sectors.

Why it matters

Rising oil prices and growing concerns regarding the sustainability of AI-driven growth pressured market sentiment during the session. Falling US yields further influenced the rotation away from the mega-cap growth stocks that have recently led the broader market.

The Philadelphia semiconductor index fell 6.72%, while CoreWeave shares dropped 10.06% to their lowest point since May 2025. Conversely, consumer staples and utilities sectors outperformed, gaining 3.11% and 1.98% respectively.

The players

S&P 500

This is a stock market index tracking the stock performance of 500 of the largest companies listed on stock exchanges in the United States.

NASDAQ

This is a global electronic marketplace for buying and selling securities that is heavily weighted toward technology and growth companies.

CoreWeave

This is a specialized cloud provider that builds infrastructure specifically for large-scale artificial intelligence and machine learning workloads.

Philadelphia semiconductor index

This is a modified market-capitalization-weighted index composed of companies primarily involved in the design, distribution, manufacture, and sale of semiconductors.

The details

Two thirds of S&P 500 constituents managed to move higher during the session despite the headline index decline. The performance disparity highlights a distinct shift in investor preference away from high-growth technology names toward defensive holdings.

May 2025 was the last time CoreWeave shares were priced this low.
July 2024 served as the previous equal-weighted index outperformance benchmark.
June 2026 was the date of the most recent comparable Philadelphia semiconductor index decline.
July 2026 was the time of the most recent comparable S&P 500 performance.
October 22, 2026, was the date of the market session.

Market Dynamics

The current market session mirrors the performance trends observed during the July 2026 S&P 500 performance. This rotation indicates a shift in investor sentiment regarding long-term growth versus defensive stability.

Retail investors may see their portfolio valuations fluctuate as capital moves from high-growth tech toward utilities and staples. This shift highlights the importance of rebalancing portfolios to align with changing interest rate and sector performance expectations.

The takeaway

Market volatility remains high as investors reassess growth prospects in an environment of rising energy costs. Diversifying holdings across defensive sectors can help mitigate the risks associated with sector-specific sell-offs in technology.