Nvidia (NVDA) and AMD shares are expected to face renewed pressure as US markets open Monday following new guidance from the Bureau of Industry and Security (BIS). According to BeInCrypto, the BIS has extended license rules to advanced AI chips sold to Chinese-owned firms abroad, closing a loophole left by the Trump administration's rescission of the Biden-era AI Diffusion Rule. The new guidance requires licenses for top-tier processors, including Nvidia's Rubin and Blackwell families and AMD's MI350x accelerator, if the buyer's ultimate parent is in China. This move aims to tighten compliance and could impact Nvidia and AMD's stock performance.