Closing Summary

U.S. stocks closed broadly lower on Monday, September 28, as a fresh wave of AI infrastructure spending concerns hit mega-cap technology and communication services names. The selloff was concentrated rather than indiscriminate: communication services and consumer discretionary led declines, while health care, consumer staples and energy held in positive territory, pointing to a classic risk-off rotation rather than a broad liquidity event.

The dominant driver was Meta Platforms, which fell nearly 5% after raising its full-year capital expenditure guidance to $125 billion-$145 billion, up from the prior $115 billion-$135 billion range, citing higher component prices and additional data center costs. That moved the market's focus back to the payback timeline on AI infrastructure buildouts. Tesla added to the pressure on growth sentiment after two major banks cut their third-quarter delivery estimates ahead of the company's October 2 delivery report.

Volatility spiked as a result: the VIX jumped more than 8% to close above 16, its highest level in recent sessions, signaling that investors are paying up for downside protection into a heavy data week. The move lower was not supported by any macro disappointment on the day; with no major economic releases on the calendar, the pullback was fundamentally company-driven, with spillover into rate-sensitive and high-multiple growth names.

Indexes

The Dow Jones Industrial Average fell 0.67%, closing at 51,481.51.

The S&P 500 Index fell 0.76%, closing at 7,684.50.

The Nasdaq Composite declined 0.92%, closing at 26,820.38.

The CBOE Volatility Index rose to 16.07, up 8.07% on the day, its strongest single-session jump in weeks. Trading activity was elevated: SPY, the largest S&P 500 tracking ETF, printed roughly 42.1 million shares versus its typical daily flow, while QQQ, the Nasdaq-100 tracker, saw about 41.4 million shares, consistent with above-average participation on down days.

Stock & Sector Performance

The session was a clear risk-off rotation, with nine of eleven sectors finishing lower. Communication services was the weakest sector, with the XLC down 1.58%, followed by consumer discretionary (XLY -1.41%) and financials (XLF -1.19%). Technology (XLK -0.89%), industrials (XLI -0.97%) and materials (XLB -0.66%) also gave back ground. On the other side of the rotation, defensive and commodity-linked groups held up: health care (XLV +0.33%), consumer staples (XLP +0.27%) and energy (XLE +0.10%) all finished in the green, indicating that money moved toward lower-beta and real-asset exposure rather than leaving the market entirely.

Magnificent Seven performance: the group finished mixed but heavily weighted to the downside. NVDA was the lone standout, advancing 1.68% and bucking the broader tech weakness. GOOGL edged down 0.34%, AAPL slipped 0.78%, MSFT fell 1.35%, AMZN declined 1.41%, TSLA dropped 3.94%, and META was the laggard, falling 4.79% on the capex guidance. The divergence between NVDA and the rest of the group underscores that Monday's selloff was driven by spending-intensity concerns rather than a blanket rejection of the AI theme.

On the company front, Meta Platforms disclosed in its earnings materials that the upward capex revision reflects expectations for increased component prices and, to a lesser degree, additional data center costs to accommodate future capacity. Management framed the quarter as the beginning of a new era in AI, citing progress on its Llama model family and early monetization of AI-powered ad tools, but investors focused on the margin and free-cash-flow implications of the higher spending path. Tesla shares weakened after JPMorgan and Goldman Sachs each lowered their Q3 2026 delivery forecasts, citing softer performance in the U.S. and China; August new vehicle registrations fell approximately 13% year over year in China and about 4% in the U.S., and the company is scheduled to report official third-quarter deliveries on October 2.

Major Company News

Meta Platforms was the single most market-moving story of the session. The company's full-year capital expenditure guidance of $125 billion-$145 billion, raised from $115 billion-$135 billion, shifted the debate from AI revenue optionality to near-term capital intensity and return-on-investment timing. The stock's nearly 5% decline and the 1.58% drop in the communication services sector show how concentrated the impact was: one company's spending plan was enough to weigh on the entire Nasdaq complex and lift the VIX above 16.