美股三大指数集体高开

Market Overview - On December 15, US stock indices opened higher, with the Dow Jones up 0.33%, Nasdaq up 0.60%, and S&P 500 up 0.45% [1][2]. Key Stock Movements - The Nasdaq China Golden Dragon Index fell by 0.5%, with notable declines in popular Chinese stocks: Baidu down over 2%, Alibaba and Li Auto down over 1% [3]. - Tesla saw an increase of over 2%, as the company's VP confirmed the testing of a driverless ride-hailing service in Austin, Texas, after canceling the safety driver requirement [3]. - Nvidia rose by over 1% following the release of its Nemotron 3 series open-source model [3]. Company-Specific News - iRobot, a manufacturer of robotic vacuum cleaners, experienced a nearly 70% drop in stock price, triggering a trading halt. The company has filed for bankruptcy and will be acquired by its contract manufacturer, Picea Robotics [4][5].