At least three of Bytedance Ltd.’s major investors have marked up the TikTok-owner’s valuation to more than $400 billion, a sharp rebound for a Chinese social video leader that has been threatened with a US shutdown.

South Korea has accused Chinese AI startup DeepSeek of sharing user data with the owner of TikTok in China. "We confirmed DeepSeek communicating with ByteDance," the South Korean data protection regulator told Yonhap News Agency. The country had already removed DeepSeek from app stores over the weekend over data protection concerns.

"We confirmed DeepSeek communicating with ByteDance," a South Korean data protection regulator told Yonhap News Agency.