S&P 500 and Nasdaq Snap Win Streak as AI Jitters Shake Tech Sector

June 30, 2026 — Nina Petrov 4 min read

Wall Street's brief recovery ended abruptly on Tuesday when the S&P 500 and Nasdaq Composite both snapped their two-week winning streaks, dragged lower by intensifying anxiety surrounding artificial intelligence stocks. The pullback arrives as investors reassess lofty valuations in the technology sector after a months-long rally that had restored confidence across equity markets. Trading volume surged on the New York Stock Exchange, with market makers reporting sharp swings in semiconductor and cloud computing names.

Technology Shares Lead the Decline

Heavyweight tech companies bore the brunt of Tuesday's selloff, with several leading AI-related stocks falling more than 3 percent in afternoon trading. The Nasdaq Composite dropped sharply as investors rotated out of names most exposed to the artificial intelligence boom, signaling a potential reassessment of the sector's valuations after its meteoric rise over the past year. Semiconductor stocks were particularly hard hit, with industry leaders Nvidia and Advanced Micro Devices both retreating from recent highs set in the previous quarter. Analysts on trading floors noted that profit-taking accelerated after key technical support levels broke, triggering automated selling programmes.

Semiconductor Supply Chain Under Pressure

Suppliers across the chipmaking supply chain also declined, reflecting broader concerns about whether the AI infrastructure buildout can maintain its current pace. Taiwan Semiconductor Manufacturing, the world's largest contract chipmaker, saw its New York-listed shares fall in line with the broader weakness. The company supplies components to virtually every major AI accelerator developer, making its share price a barometer for sector sentiment. Trading data from the CBOE Volatility Index showed a spike in options activity as funds rushed to hedge exposure to further declines.

Moderna Highlights Biotech Vulnerability

The market rout extended beyond pure technology names, with Moderna and other biotech firms caught in the broader risk-off move. Moderna shares fell amid thin trading volumes, reflecting how the AI-driven selloff has created contagion effects across growth-oriented sectors. The Cambridge, Massachusetts-based company had previously been among the pandemic-era winners but has struggled to find new catalysts as its COVID-19 franchise matures. Portfolio managers at several major asset management firms noted that positions in high-growth healthcare names were being trimmed to meet margin calls elsewhere.

Bond Market Offers Mixed Signals

Treasury yields offered a conflicting picture for equity investors trying to gauge the sustainability of the pullback. The yield on the 10-year US Treasury note dipped slightly as investors sought safe-haven assets, while the 2-year yield remained elevated relative to longer-dated maturities. This yield curve dynamics has historically signaled caution among bond traders about the economic outlook. Fixed-income strategists at major banks pointed to the differential as evidence that credit markets are pricing in a more complex scenario than equities have recently acknowledged.

What Institutional Investors Are Doing

Large institutional investors displayed divergent responses to the market turbulence, with some using the dip to accumulate selective positions while others moved to reduce overall equity exposure. Hedge funds with long-short strategies increased their net short positions in technology names, according to prime brokerage data shared with Reuters. Meanwhile, passive index funds continued their steady inflows, a pattern that has characterised markets throughout the year as retail participants buy through volatility. Mutual fund managers at several large cap-focused shops told reporters that they are holding cash levels above historical averages, suggesting room to deploy capital if valuations become more attractive.

Small-Cap Stocks Also Slip

The Russell 2000 index of smaller companies fell alongside the large-cap benchmarks, erasing its year-to-date gains in the process. Small-capitalisation stocks have struggled to attract sustained inflows as higher interest rates squeeze their financing costs more acutely than larger competitors with easier access to capital markets. Economists tracking the small-cap sector noted that the group tends to be more sensitive to domestic economic conditions, making Tuesday's decline potentially significant for gauges of underlying business confidence. Commercial real estate investment trusts, which often move in tandem with small-caps, also declined.

Earnings Season Could Determine Next Move

Market participants are now turning their attention to the upcoming corporate earnings season, where technology companies will face intense scrutiny over their AI spending plans and revenue projections. Major cloud computing providers are scheduled to report results over the next several weeks, and analysts expect artificial intelligence-related revenue to feature prominently in conference call discussions. Third-quarter gross domestic product data from the Commerce Department is due later this week, offering a fresh read on whether the broader economy remains resilient enough to support equity valuations at current multiples.

Volatility Is Likely to Persist

Options markets are pricing in elevated uncertainty through December, with implied volatility indices remaining well above their levels from the start of the quarter. This suggests that traders expect further swings as new information arrives, whether from corporate results, economic releases, or Federal Reserve communications. The central bank's next policy meeting is scheduled for early December, and investors will scrutinise any signals about the pace of interest rate adjustments. Money market funds continue to attract record inflows, indicating that many participants are positioning defensively rather than betting on an immediate recovery in risk assets.