The S&P 500 fell on Monday as technology stocks slid on escalating Iran sanctions and persistent concerns about artificial intelligence spending sustainability, marking a sober start to a week that may test whether equities can weather geopolitical tensions and market volatility.
The S&P 500 lost 13.52 points, or 0.18%, to close at 7,660.85, while the Nasdaq Composite fell 99.04 points, or 0.38%, to 26,081.41. The Philadelphia Semiconductor index, which tracks the 30 largest U.S.-traded semiconductor companies, dropped 2.64% to its lowest level in three weeks, according to Reuters reporting.
U.S. Treasury Secretary Scott Bessent warned of an “economic D-Day” against Iran in a Financial Times opinion piece and is scheduled to hold a press conference to detail new sanctions targeting Iran’s trade partners. The U.S. has threatened to restrict Iran’s access to global trade networks, a move that sent geopolitical risk rippling through markets sensitive to oil prices and supply-chain disruptions.
Chip stocks bore the brunt of the selloff. Nvidia lost 2.03%, Micron Technology shed 5.76%, and Broadcom slid 1.74%, according to the Spokesman-Review. The weakness in semiconductors reflected a convergence of two pressures: immediate concern over Iran-related sanctions and their potential impact on global trade, and a longer-running anxiety about whether massive artificial intelligence infrastructure investments can sustain their current pace.
Charlie Dai, VP principal analyst at Forrester, attributed the chip sector’s recent weakness to concerns that “AI infrastructure spending may be peaking faster than expected,” according to CNBC. Investors have grown increasingly skeptical that near-term revenues can justify the unprecedented sums being poured into AI infrastructure—a concern that has haunted the sector since late July, when chip stocks shed more than $1 trillion in market value in a single week.
The tension between geopolitical risk and technology fundamentals underscores a fragile moment for markets. Financials gained 1.19%, with JPMorgan Chase up 1.49% and Visa adding 2.64%, helping keep the blue-chip Dow Jones Industrial Average afloat—it rose 146.59 points, or 0.28%, to 53,423.60. Yet the divergence highlights how different sectors are pricing the week’s twin threats: the immediate uncertainty from Iran sanctions, and the longer-term question of whether the AI boom can deliver on its promises.
The market’s week ahead will be shaped by Nvidia’s earnings report, due later this week, and Federal Reserve Chair Kevin Warsh’s speech at the Jackson Hole Economic Symposium on Friday. Any sign of slowing AI growth in Nvidia’s results could reignite valuation concerns, while Warsh’s remarks on interest rates may offer clues to how policymakers view the Treasury’s recent emergency support measures for the bond market.
Sources
- Reuters / Spokesman-Review — S&P 500 and Nasdaq declines on August 24, 2026; Philadelphia Semiconductor index fall; individual chip stock losses; Iran sanctions context and Bessent announcement
- CNBC — Charlie Dai analyst quote on AI infrastructure spending peaking concerns; July 2026 chip sector selloff and $1 trillion market cap loss
