Diane King Hall turns to the morning's biggest movers, starting with Block (XYZ), which slid in the market after the company laid off part of its staff. The A.I. race heats up in China after Alibaba (BABA) unveiled new details around its open source model that aims to compete against DeepSeek. Nvidia (NVDA) traded lower after Reuters reported that China's H3C warned of chip shortages.