--- title: "U.S. stock night trading volatility: Arm fell 4.63% in after-hours trading, with a dual blow to stock prices from antitrust investigations and a global market stalemate" type: "News" locale: "en" url: "https://longbridge.com/en/news/286696208.md" description: "Arm fell 4.63% in after-hours trading; Micron Technology fell 1.98% in after-hours trading, with a transaction volume of USD 255 million; NVIDIA fell 1.54% in after-hours trading, with a transaction volume of USD 113 million; Intel fell 4.35% in after-hours trading, with a transaction volume of USD 994.8 million" datetime: "2026-05-18T01:36:50.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/286696208.md) - [en](https://longbridge.com/en/news/286696208.md) - [zh-HK](https://longbridge.com/zh-HK/news/286696208.md) --- # U.S. stock night trading volatility: Arm fell 4.63% in after-hours trading, with a dual blow to stock prices from antitrust investigations and a global market stalemate **US Stock Night Market Movements** Arm fell 4.63% in the night market. Based on recent key news: 1. On May 16, Arm faced an antitrust investigation by the U.S. Federal Trade Commission, primarily targeting its semiconductor technology licensing practices. This investigation may affect its market position and stock price, leading to a decline in stock price. Source: Bloomberg 2. On May 15, the talks between Trump and Xi Jinping failed to yield concrete results, with trade and geopolitical issues remaining stalled, affecting global market sentiment. Source: Jin10 Data 3. On May 16, Samsung Electronics faced a strike crisis, which could significantly impact the semiconductor supply chain and affect market confidence. Source: Jin10 Data. Regulatory risks in the semiconductor industry are increasing and need attention. **Stocks with High Trading Volume in the Industry** Micron Technology fell 1.98% in the night market. Based on recent key news: 1. On May 17, Micron Technology stated that the Chinese market remains vibrant and looks forward to deepening cooperation with local customers. This move shows the company's emphasis on the Chinese market, which may affect investor confidence and lead to stock price fluctuations. 2. On May 15, Samsung Electronics faced a strike threat, which could lead to a tightening of global DRAM supply, potentially benefiting Micron Technology. This news has increased market attention on Micron, affecting its stock price. 3. On May 15, analysts had differing ratings on Micron, reflecting market uncertainty about the duration of the AI-driven boom, affecting stock price trends. Demand in the semiconductor industry remains strong, with increased market volatility. Nvidia fell 1.54% in the night market. Based on recent key news: 1. On May 15, Nvidia's stock price rose after the U.S. approved Chinese companies to purchase its H200 processors. This move may expand Nvidia's sales in the Chinese market, driving up stock prices. 2. On May 15, Cerebras Systems went public, becoming a direct competitor to Nvidia. Cerebras' success may pose a challenge to Nvidia's market position, affecting its stock price. 3. On May 16, TIGER GLOBAL MANAGEMENT LLC increased its stake in Nvidia by 9.1%, showing investor confidence in its future growth, supporting the stock price. Demand for AI chips remains strong, with high market concentration. Intel fell 4.35% in the night market. Based on recent key news: 1. On May 16, Intel's stock price fell due to profit-taking and valuation concerns. Analysts pointed out that despite strong AI demand, the stock price has exceeded reasonable valuation ranges, leading to cautious market sentiment regarding its future performance. Source: MarketWatch 2. On May 15, Intel reached a chip manufacturing agreement with Apple, driving up stock prices. However, concerns about execution risks and the timeline for transformation still exist. Source: CNBC 3. On May 17, UBS warned of Intel's declining market share in the server CPU market, putting pressure on its stock price. AMD and Arm have expanded their market share in AI workloads, increasing competitive pressure Source: Bloomberg Technology stocks take profits, market sentiment cautious ### Related Stocks - [ARM.US](https://longbridge.com/en/quote/ARM.US.md) - [MU.US](https://longbridge.com/en/quote/MU.US.md) - [NVDA.US](https://longbridge.com/en/quote/NVDA.US.md) - [INTC.US](https://longbridge.com/en/quote/INTC.US.md) ## Related News & Research - [Is AI infrastructure spending heading for an even bigger boom? 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