U.S. stock pre-market: Advanced Micro Devices down about 18%, AMD down about 6%, Chinese concept stocks generally rise

Before the US stock market opens, Advanced Micro Devices (AMD) is down about 18%, as the company's net sales for the fourth fiscal quarter fell short of expectations. AMD is down about 6%, with the company's Q2 revenue hitting a record high and guidance exceeding expectations, but the export outlook for MI308 to China remains unclear. Chinese concept stocks are generally rising, with Bilibili up about 3%