--- title: "U.S. stock night trading volatility: IonQ fell 3.06% in after-hours trading, with high valuations and cautious market sentiment suppressing stock prices, and technological advancements unable to mask risks" type: "News" locale: "en" url: "https://longbridge.com/en/news/286509075.md" description: "IonQ fell 3.06% in after-hours trading; SanDisk fell 3.78% with a transaction volume of $232 million; Apple rose 0.28% in after-hours trading with a transaction volume of $11.01 million; Western Digital fell 2.71% in after-hours trading with a transaction volume of $7.66 million" datetime: "2026-05-15T04:56:45.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/286509075.md) - [en](https://longbridge.com/en/news/286509075.md) - [zh-HK](https://longbridge.com/zh-HK/news/286509075.md) --- # U.S. stock night trading volatility: IonQ fell 3.06% in after-hours trading, with high valuations and cautious market sentiment suppressing stock prices, and technological advancements unable to mask risks **U.S. Stock Night Market Movements** IonQ fell 3.06% in the night market. Based on recent key news: 1. On May 12, IonQ released its quarterly financial report, with revenue increasing by 755% year-on-year, but analysts warned of overvaluation, leading to stock price fluctuations. IonQ raised its full-year revenue guidance to $260-270 million. Despite strong overall industry performance, concerns about valuation remain in the market. 2. On May 14, IonQ opened a new R&D and chip testing laboratory in Colorado to promote technological advancements. This laboratory will help IonQ design and test the ion trap chips at the core of its quantum systems. Despite this move showing technological progress, the stock price still fell by 1.09%. 3. On May 13, the quantum computing industry performed strongly overall, with peer companies like D-Wave and Rigetti also achieving significant growth. However, the market remains cautious about the long-term adoption path of the industry. Analysts pointed out that despite rapid industry growth, mainstream adoption will still take time. The quantum computing industry is growing rapidly, with high valuation risks. **Stocks with High Trading Volume in the Industry** SanDisk fell 3.78% in the night market. Based on recent news: 1. On May 12, South Korean policy officials proposed taxing AI profits, raising concerns in the market about potential additional tax burdens on chip manufacturers, leading to a 3.3% drop in SanDisk's stock price. 2. On May 13, the U.S. stock market retraced, with tech stocks taking profits, and SanDisk's stock price fell, reflecting the market's reaction to high-end profit-taking. 3. On May 13, S&P upgraded SanDisk's rating to "BB+", with a positive outlook, but the stock price still fell, indicating market concerns about its high valuation. AI demand surged, and demand for storage chips remained strong. Apple rose 0.28% in the night market. Based on recent key news: 1. On May 15, tensions arose in Apple's partnership with OpenAI, with OpenAI preparing to take legal action, causing Apple's stock price to drop by 1.2% to $295.38 at one point. Reports indicated that OpenAI was dissatisfied with not achieving expected benefits from the partnership, believing Apple did not make sufficient efforts to promote ChatGPT. 2. On May 15, Apple announced a price reduction of 1,000 RMB for the iPhone 17 Pro series, stimulating sales expectations. Analysts believe this will drive a new wave of sales peaks, especially before the 618 shopping festival. 3. On May 14, KeyBanc analysts took a cautious stance on Apple stock, believing it is overvalued and pointing out that U.S. hardware demand is returning to normal seasonality, posing challenges for Apple's stock price. Industry trends are significantly influenced by AI technology, leading to increased market volatility. Western Digital fell 2.71% in the night market. Based on recent key news: 1. On May 15, a FactSet survey showed analysts raised Western Digital's target price to 515 RMB, with stock performance outperforming the market. Analysts hold an optimistic view of its future performance, driving the stock price up 2. On May 12, SanDisk's market value exceeded $50 billion since its split from Western Digital, with AI demand driving a 251% increase in revenue. This market dynamic has impacted Western Digital's market position. 3. On May 12, technology fund Coatue Management predicted that memory demand will grow fivefold in the next five years, driving up the stock prices of related companies. As a NAND supplier, Western Digital benefits from this trend. 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