S&P 500 Falls 0.7 Percent and Nasdaq Drops 1.2 Percent on September 14 as Anthropic and OpenAI CEOs Call for AI Development Slowdown, Semiconductor Stocks Tumble 5.7 Percent

US equity markets declined on Monday September 14, with the S&P 500 falling 0.7 percent, the Dow Jones Industrial Average down 0.2 to 0.3 percent, and the Nasdaq Composite losing 1.2 percent, according to multiple outlets including Bloomberg, CNBC, and Trading Economics. The technology-heavy Nasdaq 100 fell 1.3 to 1.7 percent, led by sharp losses in semiconductor and AI-related stocks after Anthropic CEO Dario Amodei published a 3,800-word essay over the weekend calling for AI companies to slow the pace of improving AI model capabilities due to safety concerns. OpenAI CEO Sam Altman agreed in a post on X, with OpenAI CFO Sarah Friar having told employees in August that the company would delay its initial public offering until 2027 following internal debate over timing and market conditions. The VanEck Semiconductor ETF fell more than 4 percent on the day, with Nvidia down 3 to 4 percent, Lam Research tumbling 8 percent, Marvell Technology losing 7.6 percent, and Corning sinking 9.2 percent after announcing a 2 billion dollar equity offering. The sell-off extended globally, with semiconductor shares under heavy pressure from the US to Europe and Asia, while a key industry gauge sank 5.7 percent. Monday's decline continues a rough pattern of weekly starts for stocks, with the three major indexes having opened either mixed or lower for six weeks straight. Markets also faced pressure from surging oil prices, which topped 108 dollars per barrel for Brent and 104 dollars for WTI after Saudi Arabia shut down the East-West pipeline following drone attacks and Iran-GCC talks were postponed, raising fresh inflation concerns ahead of Wednesday's Federal Reserve decision. Software stocks were insulated from the pain, with the iShares Expanded Tech-Software Sector ETF climbing around 5 percent, led by SentinelOne up 16 percent and Zscaler and CrowdStrike each jumping more than 15 percent. The VIX volatility index rose 0.86 percent as traders hedged against potential surprises f