美股三大指数集体高开，道指涨0.08%，纳指涨0.52%，标普500指数涨0.26%，诺和诺德跌超21%

Group 1 - Major US stock indices opened higher, with the Dow Jones up 0.08%, Nasdaq up 0.52%, and S&P 500 up 0.26% [1] - Novo Nordisk experienced a significant decline of over 21% after the company lowered its 2025 outlook [1] - UnitedHealth fell more than 5% as the company's fiscal year 2025 guidance was below market expectations [1]