Fundstrat global head of technical strategy Mark Newton has urged investors to buy technology stock pullbacks while maintaining asset diversification, following sector shifts that saw the equal-weight S&P 500 drop approximately 6%. Despite recent pullbacks, the headline S&P 500 reached a new record high just seven trading days prior to the strategy discussion.
Sector Rotation and Growing Market Volatility
Newton noted on CNBC that 2026 market dynamics have been defined by heavy sector rotation. The shift initially began with an almost 40% energy rally before moving into technology, while healthcare stocks have recently climbed to record highs. Although tech stocks fell sharply last week, Newton emphasized that the sector has surrendered very little of its September gains despite heightened cross-asset volatility over the past month.
AI Debt Exposure and Heavy Index Weighting
Concerns over AI infrastructure buildouts were highlighted by CoreWeave (CRWV), which saw its stock decline 15% at one point before turning positive on Thursday as higher bond yields pressure its debt obligations. Weakness also spread to memory and chipmakers, including Seagate, Western Digital, Intel, and South Korea-based SK Hynix. This tech weakness comes amid broader supply chain headwinds, similar to recent memory inflation concerns affecting hardware manufacturers and semiconductor challenges such as rising competition for South Korea's chip industry.
Steve Sosnick, chief strategist at brokerage Interactive Brokers, estimated that S&P 500 index funds currently hold 45% or more in technology. Sosnick noted that while market optimism previously justified financing costs at 9% or 20%, heavy selling in tech could trigger downside momentum selling across broader index ETFs. Sosnick warned, "we are all heavily invested in AI whether we want to be or not."
Key Takeaways
- Fundstrat's Mark Newton recommends buying tech pullbacks while diversifying across non-tech sectors.
- The equal-weight S&P 500 slid about 6%, contrasting with the headline index hitting a record seven trading days earlier.
- CoreWeave (CRWV) dropped 15% before recovering Thursday, highlighting debt-funding concerns.
- Technology accounts for 45% or more of S&P 500 index fund weightings according to Interactive Brokers.
Why It Matters
The heavy concentration of technology assets in standard index funds means broad market exposure is closely tied to AI infrastructure debt and profitability returns. If high borrowing costs compress margins for infrastructure providers, index-driven ETF sell-offs could spread tech-specific weakness into the broader economy. Investors must closely watch corporate debt yields and AI return-on-investment metrics to evaluate whether current price dips represent sound entry points or systemic valuation risks.
