U.S. Stocks Edge Lower as Tech Slumps Ahead of Key Nvidia Earnings; Moderna Rally Fuels Healthcare Surge

The S&P 500 and Nasdaq Composite both declined on Monday, August 24, as technology stocks came under pressure amid renewed geopolitical tensions, while investors braced for upcoming Nvidia earnings and an inflation report. Meanwhile, Moderna rallied sharply on encouraging vaccine-trial results, lifting healthcare stocks across the market.

Tech-Driven Market Pullback Ahead of Nvidia’s Report

On Monday, August 24, the S&P 500 slid 0.3%, closing at 7,652.86, while the Nasdaq Composite dropped 0.8% to finish at 25,980.19. The Dow Jones Industrial Average bucked the trend, rising 0.3% to end at 53,417.16 .

Markets were rattled by escalating tensions with Iran and uncertainty over U.S. sanctions, as well as cautious investor sentiment ahead of a highly anticipated Nvidia earnings release and a key inflation report. Reports noted the potential expansion of sanctions on countries dealing with Iran, though no new penalties had yet been actually imposed .

Investors viewed Nvidia’s upcoming quarterly results as a critical test for the AI-driven rally that has buoyed markets all year. Commentary highlighted the dual pressure: Nvidia must deliver strong results to stabilize one leg of the market, while Federal Reserve commentary later in the week—specifically from Fed Chairman Kevin Warsh—will influence rate outlooks, forming the other stabilizing pillar .

Moderna’s Clinical Success Sparks Healthcare Rally

Separately, shares of Moderna surged early this week following breakthrough data from its melanoma vaccine trial. The report triggered a dramatic rally in Moderna stock, which in turn lifted the entire healthcare sector.

On Wednesday, August 19, the S&P 500 healthcare sector rose more than 3%, marking a record-high performance among the S&P’s 11 major sectors. This surge added meaningful support to the broader index, even as tech lagged .

Looking Ahead: Drivers and Implications

The market now faces several near-term catalysts. Nvidia’s earnings report, due Wednesday, could reignite momentum in growth and AI-related stocks—either stabilizing or deepening the technology-driven sell-off. Later in the week, attention will shift to Fed Chairman Kevin Warsh’s remarks, which could shape investor expectations around monetary policy and rate moves.

Meanwhile, Moderna’s strong results highlight the potential for healthcare innovation to reshape sector leadership in the near term. Investors will likely monitor whether this sector momentum holds as more biotech and healthcare firms report updates.

With war tensions, tech earnings, and monetary policy all in focus this week, markets may continue to exhibit heightened sensitivity to both sector-specific and macroeconomic developments.

Bottom line: A tech-led dip in Monday trading ahead of key Nvidia earnings contrasts sharply with a healthcare rally driven by clinical news. Both developments could steer U.S. equity direction in the days ahead.