China's move against Micron, the biggest US memory chipmaker, was widely seen as retaliation for Washington's efforts to restrict Beijing's access to key technology
Shares in South Korea's Samsung Electronics and SK Hynix rose in morning trade on Monday after China failed US memory chip rival Micron Technology in a security review.
China's cyberspace regulator said on Sunday that products made by Micron had failed its network security review, and it would bar operators of key infrastructure from buying from the company.
Samsung shares were up 0.7%, while SK Hynix shares rose 1.1% versus the wider market's 0.8% gain.
China had announced its review of Micron's products in late March, after Washington imposed a series of export controls on chipmaking technology to China.
SK Hynix had no comment. Samsung Electronics did not have an immediate comment.