S&P500 and Nasdaq 100: Powell Says US Stocks Are Overvalued, Tech Sector Slides

U.S. equities retreated, with the S&P 500 down 0.6% and Nasdaq falling 1%, as fading AI enthusiasm and Fed Chair Powell's comments on "fairly highly valued" equities and an uncertain rate path weighed on sentiment. Profit-taking hit AI heavyweights like Nvidia (-3%), while the Energy sector gained 1.82% and the Russell 2000 showed relative strength. Market focus now shifts to Friday's PCE inflation report and increasing government shutdown risks, suggesting a potentially rangebound environment with ongoing pressure on tech and continued interest in energy and small-cap segments.

Analysis

U.S. equity markets experienced a broad pullback, with the S&P 500 declining 0.6% and the tech-heavy Nasdaq Composite leading losses with a 1% drop. The downturn was driven by a combination of profit-taking in previously high-flying artificial intelligence stocks and cautious commentary from Federal Reserve Chair Jerome Powell. AI-centric names like Nvidia (-3%) and Oracle (-4%) faced significant pressure as investors reassessed valuations and execution risks, including concerns over energy capacity for large-scale AI infrastructure and drawing comparisons to dot-com era exuberance. Chair Powell's statement that equity prices are "fairly highly valued" and his description of the interest rate path as "uncertain" and "challenging" directly curbed investor expectations for imminent rate cuts, adding to the cautious sentiment. Amidst the tech sector's 1.3% decline, there was a clear rotation into other market segments. The energy sector emerged as the top performer, gaining 1.82% on the strength of names like Halliburton (+6.8%). Furthermore, the Russell 2000 index of small-cap stocks displayed notable relative strength, briefly touching a record high. Looking ahead, market participants are focused on two primary catalysts: the upcoming PCE inflation report, which will be critical for gauging the Fed's next move, and the increasing political risk of a U.S. government shutdown ahead of the September 30 deadline.

Key Decisions for Investors

• Investors should re-evaluate exposure to mega-cap technology and AI-related stocks, as profit-taking and explicit valuation warnings from the Federal Reserve may signal continued near-term pressure on the sector.
• Consider rotating capital towards sectors demonstrating relative strength, such as energy and small-caps, which are currently outperforming the broader market and showing positive investor sentiment.
• Maintain a cautious stance and monitor key upcoming catalysts, specifically the PCE inflation report for monetary policy cues and political developments in Washington regarding the looming government shutdown, which could introduce significant market volatility.