--- title: "U.S. stock night trading fluctuations: Arm rose 3.17% in night trading, with a mix of technology licensing and market expectations, while antitrust investigations triggered volatility risks" type: "News" locale: "en" url: "https://longbridge.com/en/news/287157968.md" description: "Arm rose 3.17% in the after-hours market; Micron Technology rose 3.01%, with a transaction volume of USD 456 million; NVIDIA fell 0.94% in the after-hours market, with a transaction volume of USD 182 million; Intel rose 0.18% in the after-hours market, with a transaction volume of USD 68.35 million" datetime: "2026-05-21T04:51:44.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/287157968.md) - [en](https://longbridge.com/en/news/287157968.md) - [zh-HK](https://longbridge.com/zh-HK/news/287157968.md) --- # U.S. stock night trading fluctuations: Arm rose 3.17% in night trading, with a mix of technology licensing and market expectations, while antitrust investigations triggered volatility risks **U.S. Stock Market After-Hours Movements** Arm rose 3.17% in after-hours trading. Based on recent key news: 1. On May 19, National Technology signed a technology licensing agreement with Arm Technology, strengthening collaboration in embedded chip design and driving up stock prices. Source: People's Financial News 2. On May 18, the U.S. FTC launched an antitrust investigation into Arm, which may affect its chip licensing model, leading to stock price fluctuations. Source: Zhitong Finance 3. On May 21, Citigroup predicted significant growth in the data center market, boosting stock prices of related companies. Source: Daily Economic News, semiconductor industry technological innovation drives long-term potential. **Stocks with High Trading Volume in the Industry** Micron Technology rose 3.01% in after-hours trading. Based on recent key news: 1. On May 20, Micron's stock price rose due to comments at a JP Morgan conference stating that the company's financial outlook has improved. JP Morgan indicated that Micron's free cash flow for the third fiscal quarter is expected to reach a new high, driving up stock prices. 2. On May 20, Mizuho raised Micron's target price from $740 to $800, maintaining an "Outperform" rating. Analysts' optimistic expectations for Micron further boosted stock prices. 3. On May 20, Citigroup raised Micron's target price from $425 to $840, reiterating a "Buy" rating. Citigroup believes that after the increase in DRAM prices, Micron's future profitability will significantly improve. The semiconductor industry has performed strongly recently, with tight rare earth supply. Nvidia fell 0.94% in after-hours trading. Based on recent key news: 1. On May 20, Nvidia released its Q1 FY2027 financial report, with revenue of $81.6 billion, exceeding market expectations, but failing to impress the market, leading to a post-market drop of about 3%. 2. On May 21, Nvidia announced an $80 billion stock buyback plan and increased its quarterly dividend from $0.01 to $0.25 per share in an attempt to appease investors, but the stock price still declined. 3. On May 19, options market data showed that traders expect Nvidia's stock price to fluctuate by about 6.5% after the earnings report, with complex market sentiment, as some call options evaporated due to the stock price retreating. The market anticipates significant stock price fluctuations around Nvidia's earnings report, with strong overall industry performance but structural concerns. Intel rose 0.18% in after-hours trading. Based on recent key news: 1. On May 19, Intel CEO Pat Gelsinger stated that the rise of agent-based AI has driven explosive growth in CPU demand, with some customers prepaying for substrates to ensure supply. This reflects the market's strong commitment to Intel, driving up stock prices. Source: Zhitong Finance 2. On May 18, Citigroup raised Intel's target price from $95 to $130, with analysts believing that AI development will accelerate CPU demand growth, enhancing market confidence. Source: Jinshi Data On May 18, U.S. President Trump stated in an interview with Fortune magazine that the stock price of Intel soared after the government acquired shares, indicating a positive market response to government support. Source: Wall Street Insight Technology stocks rebound, market sentiment is positive ### 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 - [Key facts: ARM Shares Jump 15% to 52-Week High; Bernstein Cites Cloud Demand](https://longbridge.com/en/news/287174307.md) - [Is AI infrastructure spending heading for an even bigger boom? 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