--- title: "U.S. stock night trading volatility: Western Digital fell 3.06% in after-hours trading: CEO's share reduction combined with guidance not meeting Seagate's, AI benefits unable to mask valuation pressure" type: "News" locale: "en" url: "https://longbridge.com/en/news/296309439.md" description: "Western Digital fell 3.06% in after-hours trading; SanDisk fell 3.62%, with a trading volume of USD 567 million; Apple rose 0.24% in after-hours trading, with a trading volume of USD 13.54 million; Seagate Technology fell 2.83% in after-hours trading, with a trading volume of USD 10.08 million" datetime: "2026-08-19T06:07:48.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/296309439.md) - [en](https://longbridge.com/en/news/296309439.md) - [zh-HK](https://longbridge.com/zh-HK/news/296309439.md) generator: "portal-rs" --- # U.S. stock night trading volatility: Western Digital fell 3.06% in after-hours trading: CEO's share reduction combined with guidance not meeting Seagate's, AI benefits unable to mask valuation pressure **U.S. Stock Night Market Movements** Western Digital fell 3.06% in the night market. Based on recent key news: 1. On August 19, analysts downgraded Western Digital's rating due to its first fiscal quarter gross margin guidance being lower than competitor Seagate, raising concerns about the normalization of average selling prices. This news weakened investor confidence, leading to a drop in stock price. 2. On August 11, Western Digital CEO Irving Tan sold 20,000 shares of stock worth $8.9 million, resulting in a significant decrease in insider holdings, further undermining investor confidence. 3. On August 17, Jim Cramer pointed out that the rapid growth of AI demand is changing the cyclical characteristics of the storage industry. As one of the key suppliers, Western Digital may benefit from the expansion of AI infrastructure. The storage industry is driven by AI demand, with an optimistic outlook. **Stocks with High Trading Volume in the Industry** SanDisk fell 3.62% in the night market. Based on recent key news: 1. On August 17, Jane Street Capital's significant withdrawal from the SA fund led to a drop in SanDisk's stock price. The margin safety cushion of the SA fund was breached, forcing Jane Street Capital to sell positions to resolve a margin call crisis, dragging SanDisk's stock price down by 46.57%. Source: Zhitong Finance 2. On August 18, the SanDisk Investor Day event released positive signals, driving the stock price up. Bank of America analysts noted that SanDisk's long-term growth targets and high gross margin outlook indicate that the storage industry is entering a more sustained phase, supporting a rebound in stock price. Source: Wall Street Insight 3. On August 19, rising bond yields led to an overall decline in storage stocks. Micron and SanDisk's stock prices were affected due to market concerns that rising financing costs could reduce AI infrastructure spending. Source: Barron's Weekly, strong demand in the storage industry, tight supply. Apple rose 0.24% in the night market. Based on recent key news: 1. On August 19, Apple announced adjustments to its charging policy for app developers to comply with the EU Digital Markets Act. The new policy will charge a 5% commission on digital transactions in apps distributed through channels other than the App Store, resolving differences with the European Commission. This move is expected to impact Apple's service business revenue. 2. On August 18, Sensor Tower data showed that global user spending on the App Store grew only 3% year-on-year, far below last year's 13%. Weak consumer demand and macroeconomic uncertainty are suppressing demand, affecting Apple's stock price. 3. On August 17, Apple retail store employees received notice that Apple's fall launch event will be held in early September, expected to unveil the iPhone 18 series and the first foldable iPhone. The news of the new product launch boosted market expectations. There are doubts about Apple's long-term commission rates for its service business, with increasing regulatory pressure. Seagate Technology fell 2.83% in the night market. Based on recent key news: 1. On August 17, Cramer pointed out that although there is opposition to data center construction in some areas, the rapid growth of AI demand may benefit the storage industry. The strong performance of Amazon and Anthropic indicates robust demand for AI infrastructure, and Seagate Technology, as one of the key suppliers, has been affected in its stock price. 2. On August 18, Seagate Technology's annualized return over the past 20 years has been 21.45%, showing excellent market performance. Nevertheless, analysts believe there are better investment options currently, and Seagate Technology failed to make the recommended list, leading to pressure on its stock price. 3. On August 19, the enterprise storage market experiences cyclical fluctuations, with falling flash memory prices and industry oversupply threatening Seagate's operating profits for hard drives, causing market concerns about its future performance and a decline in stock price. The storage industry is driven by AI demand, but risks of market supply and demand fluctuations still exist ### Related Stocks - [WDC.US](https://longbridge.com/en/quote/WDC.US.md) - [SNDK.US](https://longbridge.com/en/quote/SNDK.US.md) - [AAPL.US](https://longbridge.com/en/quote/AAPL.US.md) - [STX.US](https://longbridge.com/en/quote/STX.US.md) ## Related News & Research - [Western Digital, Tohoku University launch AI data infrastructure lab in Japan](https://longbridge.com/en/news/296382332.md) - [A mysterious free AI model is impressing developers. 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