--- title: "Pre-market hot trades in US stocks: Rio Tinto pre-market down 4.64%; Bloom Energy pre-market down 4.63%" type: "News" locale: "en" url: "https://longbridge.com/en/news/286549884.md" description: "Rio Tinto pre-market down 4.64%; Bloom Energy pre-market down 4.63%; HCW Biologics pre-market up 128.87%; Dreamland pre-market up 93.75%; Auddia pre-market up 60.66%" datetime: "2026-05-15T10:43:00.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/286549884.md) - [en](https://longbridge.com/en/news/286549884.md) - [zh-HK](https://longbridge.com/zh-HK/news/286549884.md) --- # Pre-market hot trades in US stocks: Rio Tinto pre-market down 4.64%; Bloom Energy pre-market down 4.63% **Pre-market Hot Trades in US Stocks** Rio Tinto fell 4.64% in pre-market trading. Based on recent key news: 1. On May 12, Rio Tinto signed a decarbonization cooperation agreement with Beijing University of Science and Technology to promote the research and application of low-carbon ironmaking solutions, which may affect market confidence in Rio Tinto's long-term environmental strategy. 2. On May 13, the China Iron and Steel Association met with senior executives from Rio Tinto to discuss the development trends of the Chinese steel industry and green low-carbon exploration, which may influence market perceptions of Rio Tinto's strategic positioning in the Chinese market. 3. On May 14, Rio Tinto appointed Trudy Charles as Chief Legal Officer, emphasizing the company's improvements in governance and corporate affairs capabilities, which may impact investor confidence in corporate governance. Copper prices are volatile, with the market maintaining optimism about long-term demand. Bloom Energy fell 4.63% in pre-market trading. Based on recent key news: 1. On May 14, Bloom Energy's Q1 revenue grew 130% to $751 million, exceeding expectations, and raised its full-year outlook. The surge in power demand from AI data centers has driven order and backlog growth. Despite strong fundamentals, analysts warn that its high valuation may pose risks. 2. On May 13, Barclays raised Bloom Energy's target price from $177 to $254, maintaining a "hold" rating. This move reflects the growth potential of power demand from AI data centers. 3. On May 12, Bloom Energy's stock price soared 1,414% over the past year, primarily benefiting from AI-driven power demand for data centers and a growing $24 billion service backlog. AI demand drives growth, with significant valuation risks. **Top Gainers in Pre-market US Stocks** HCW Biologics rose 128.87% in pre-market trading. Based on recent key news: 1. On May 14, HCW Biologics released its Q1 2026 financial report, showing significant progress in the field of innovative combination immunotherapy. The stock price surged after the report was released, reflecting market optimism about the company's future development. Source: HCW Biologics official announcement 2. On May 14, HCW Biologics discovered in IND-enabled research that its drug HCW11-040 can prevent bronchopulmonary dysplasia (BPD), with research expected to be completed and IND application submitted in the second half of 2027. This discovery has enhanced investor confidence in the company's R&D capabilities, driving the stock price up. Source: Reuters 3. On May 15, analysts gave HCW Biologics a "buy" rating, with Wall Street's 12-month price target set at $2.00, approximately 472.4% higher than the closing price of $0.35 on May 13. This optimistic analyst rating further stimulated the stock price increase. Source: Reuters The biotechnology sector has recently performed strongly, with significant capital inflows Dreamland pre-market rose 93.75%. Based on recent key news: 4. On May 12, Dreamland announced the signing of a memorandum of understanding with LinkFung Innovation, aimed at enhancing service capabilities through AI technology. This move is seen as an important step in the company's strategic market expansion, driving the stock price up. 5. On May 13, Dreamland's stock price surged 126.92%, closing at $2.36, with a trading volume of $219 million. This abnormal movement is believed to be the result of speculative funds pouring in, with technical indicators showing a clear market sentiment drive. 6. On May 14, technical analysis showed that Dreamland's RSI reached 97.75, indicating that the stock price is severely overbought, posing a risk of sharp correction. The stock price is far above key moving averages, and the market holds an optimistic view on future performance. There have been no significant positive developments in the film and entertainment industry recently. Auddia pre-market rose 60.66%. Based on recent key news: 1. On May 15, Auddia submitted an S-4 filing to merge with Thramann Holdings, establishing McCarthy Finney as a unified AI platform. This move is seen as a strategic expansion for the company, significantly boosting the stock price. Source: Reuters 2. On May 12, Auddia's directors and executives participated in a proxy solicitation related to the merger transaction, with relevant information disclosed on the company's website and SEC filings, increasing market confidence in the merger. Source: Auddia Inc. 3. On May 12, Auddia detailed the interests of its directors and executives in its annual report, further enhancing investor trust in corporate governance, supporting the stock price increase. Source: Auddia Inc. 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