--- title: "U.S. stock night trading volatility: Super Micro Computer fell 3.09% in night trading, facing regulatory investigation and a downward revision of gross margin guidance, raising concerns about profitability" type: "News" locale: "en" url: "https://longbridge.com/en/news/298871498.md" description: "Super Micro Computer fell 3.09% in the after-hours market; SanDisk fell 4.46% in the after-hours market, with a transaction volume of USD 232 million; Apple fell 0.83% in the after-hours market, with a transaction volume of USD 3.703 million; Dell Technologies - C fell 2.50% in the after-hours market, with a transaction volume of USD 3.23 million" datetime: "2026-09-14T05:53:44.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/298871498.md) - [en](https://longbridge.com/en/news/298871498.md) - [zh-HK](https://longbridge.com/zh-HK/news/298871498.md) generator: "portal-rs" --- # U.S. stock night trading volatility: Super Micro Computer fell 3.09% in night trading, facing regulatory investigation and a downward revision of gross margin guidance, raising concerns about profitability **U.S. Stock Market After-Hours Movements** Super Micro Computer fell 3.09% in after-hours trading. Based on recent key news: 1. On September 12, Super Micro Computer was investigated, with Kahn Swick & Foti, LLC announcing an investigation into potential misconduct, increasing regulatory risks and putting pressure on the stock price. 2. On September 12, management clarified during an investor meeting that the surge in gross margin for the fourth quarter was mainly due to non-recurring factors related to contract delays, and they expect future gross margins to revert to 10%-11%, raising market concerns about profitability. 3. On September 11, Super Micro Computer projected sales for fiscal year 2027 to be between $65 billion and $72 billion, significantly exceeding Wall Street expectations; however, concerns about its profitability remain. AI demand is strong, and market competition is fierce. **Stocks with High Trading Volume in the Industry** SanDisk fell 4.46% in after-hours trading. Based on recent key news: 1. On September 11, the AI hedge fund Situational Awareness was active in the options market, purchasing hundreds of millions of dollars in options, including those for SanDisk. This move may attract market attention to SanDisk stock, leading to price volatility. (Source: Jinse Finance) 2. On September 10, a Goldman Sachs report indicated that the worst phase of the downturn in the storage chip industry may have ended, and investors might reposition in this sector. This news boosted market confidence in SanDisk but also highlighted the cyclical risks in the storage industry. (Source: Goldman Sachs) 3. On September 11, Changxin Storage's profit margins significantly increased, surpassing competitors like SanDisk, demonstrating the fierce competition in the storage chip market, which may pressure SanDisk's market share. (Source: Jinshi Data) The storage chip industry is highly competitive, with high volatility risks. Apple fell 0.83% in after-hours trading, with a trading volume of $37.03 million, and no significant news recently. Trading is active, with clear capital flows; considering sector and industry trends, the stock shows significant volatility, and specific reasons need further observation. Dell Technologies-C fell 2.50% in after-hours trading. Based on recent key news: 1. On September 11, Royal Bank of Canada Capital Markets initiated coverage of Dell Technologies with an "Outperform" rating and a target price of $640. This move spurred the stock price to surge nearly 12% that day, with a cumulative increase of 350% this year. 2. On September 11, Dell Technologies reported second-quarter results that exceeded market expectations and raised its full-year revenue forecast to $192 billion, nearly a 70% increase from last year. Company executives stated during the earnings call that due to rising costs of computer components like memory, they are increasing product prices. 3. On September 11, Dell Technologies announced that its backlog of AI server orders amounts to $95 billion, which has yet to be fulfilled. Second-quarter AI server sales were approximately $16.4 billion, indicating strong market demand. The demand for AI is robust, and Dell is benefiting significantly ### Related Stocks - [SMCI.US](https://longbridge.com/en/quote/SMCI.US.md) - [SMCY.US](https://longbridge.com/en/quote/SMCY.US.md) - [SMCL.US](https://longbridge.com/en/quote/SMCL.US.md) - [SMCX.US](https://longbridge.com/en/quote/SMCX.US.md) - [SMCZ.US](https://longbridge.com/en/quote/SMCZ.US.md) ## Related News & Research - [NVIDIA Corporation $NVDA Shares Sold by Summit Wealth Group LLC](https://longbridge.com/en/news/299990664.md) - [SMCI Stock Alert: What to Know as Super Micro Computer Wraps Investigation](https://longbridge.com/en/news/296529809.md) - [Super Micro Computer, Inc. $SMCI Position Increased by TD Waterhouse Canada Inc.](https://longbridge.com/en/news/298428833.md) - [Super Micro stock climbs as earnings soar past expectations](https://longbridge.com/en/news/295578854.md) - [Super Micro director and 10% owner Liu Liang Chiu-Chu Sara sells USD 7.32 million in common shares](https://longbridge.com/en/news/298372704.md) --- > **Disclaimer: This article is for reference only and does not constitute any investment advice.**