--- title: "U.S. stock market midday update: Founder stock price plummets 26.14%, trading volume surges, what causes such volatility in market sentiment?" type: "News" locale: "en" url: "https://longbridge.com/en/news/287938472.md" description: "Founder fell 26.14%; Sterling Infrastructure rose 0.80%, with a transaction volume of USD 167 million; Daikang Industrial fell 0.04%, with a transaction volume of USD 163 million; Comfort Systems USA fell 2.58%, with a transaction volume of USD 153 million; Quanta Services fell 1.12%, with a market value of USD 109 billion" datetime: "2026-05-28T14:42:41.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/287938472.md) - [en](https://longbridge.com/en/news/287938472.md) - [zh-HK](https://longbridge.com/zh-HK/news/287938472.md) --- # U.S. stock market midday update: Founder stock price plummets 26.14%, trading volume surges, what causes such volatility in market sentiment? **U.S. Stock Market Midday Update** Founder, down 26.14%, with increased trading volume and no significant news recently. The trading is active, with clear capital flow. Considering the sector and industry trends, the stock shows significant volatility, and the specific reasons need further observation. **Stocks with High Trading Volume in the Industry** Sterling Infrastructure up 0.80%. Sterling Infrastructure up 0.80%. No significant news recently; trading is active, with clear capital flow. Considering the sector and industry trends, the stock shows significant volatility, and the specific reasons need further observation. no\_news DaiKang Industrial down 0.04%. Based on recent key news: 1. On May 27, DaiKang Industrial announced its first-quarter financial report, with adjusted EBITDA of $262.5 million, pre-tax profit of $106.7 million, net income of $91.3 million, and contract revenue of $1.9648 billion. Strong financial report data drove the stock price up. 2. On May 27, DaiKang Industrial announced the acquisition of National Technology Integrators for $275 million, aiming to enhance its digital infrastructure capabilities. This move is seen as a strategic expansion, further driving the stock price up. 3. On May 28, analysts raised DaiKang Industrial's average target price from $473.82 to $486.55, maintaining a "Buy" rating, reflecting market confidence in its future growth. Strong industry demand and data center construction drive growth. Comfort Systems USA down 2.58%. Based on recent key news: 1. On May 28, analyst ratings showed that although Comfort Systems USA was rated as a Buy, top analysts believe there are five stocks that are more attractive. This rating may lead to a decline in investor confidence, affecting the stock price. 2. On May 27, Comfort Systems USA's analyst ranking in the S&P 500 rose to 33rd, showing market confidence in its long-term performance. However, the failure to enter the top recommended list in the short term may negatively impact the stock price. 3. On May 26, market observations showed that Comfort Systems USA's stock price has risen 102.8% year-to-date, but it was not included in the top five stocks recommended by top analysts recently, which may lead some investors to take profits. The market remains optimistic about Comfort Systems USA's long-term performance. **Stocks with High Market Capitalization in the Industry** Quanta Services down 1.12%. Based on recent news, 1. On May 28, Oppenheimer upgraded Quanta Services to "Outperform," setting a target price of $800. Despite the upgrade, the stock price fell 1.3% in early trading, closing at $724. Analysts believe that utility and technology spending support long-term growth, with power, pipeline, and transmission projects providing additional upside potential 2. On May 27, Joseph Kim, a director of Quanta Services, submitted an initial Form 3 ownership statement. The statement was released by Quanta Services through the EDGAR system of the U.S. Securities and Exchange Commission, showing Kim's shareholding in the company. 3. On May 22, Quanta Services appointed Joseph Kim as a member of the board of directors. Kim is the President and CEO of Sunoco GP and has held senior positions at Sunoco, Pizza Hut, and Valero Energy. 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