Wall Street closes lower as investors reassess the outlook for AI-related spending and weigh pressure on semiconductor stocks. Multiple reports say the Nasdaq and the S&P 500 finish at levels below recent trading, with losses concentrated in semiconductors. The selloff follows renewed scrutiny of how much AI investment companies are making and how those projects are being financed. Investors focus on concerns that some AI expansion—such as capacity increases and related technology spending—is being funded through rising debt, raising questions about costs and financial risk if growth or demand does not meet expectations. Separately, reports also cite investor positioning ahead of the U.S. Federal Reserve, with markets preparing for a potentially more hawkish stance. The combination of sector-specific weakness and broader rate expectations contributes to a cautious tone as the major indexes end the session at more than one-week lows.