U.S. Suppliers Halt Operations at Top Chinese Memory Chip Maker

BEIJING–U.S. chip equipment suppliers are pulling out staff based at China’s leading memory chip maker and pausing business activities there, according to people familiar with the matter, as they rush to assess the impact of Commerce Department semiconductor export restrictions.

State-owned Yangtze Memory Technologies Co. is facing a freeze in support from key suppliers including KLA and Lam Research the people said. The suspensions follow last week’s sweeping curbs imposed by the U.S. on China’s chip sector, ostensibly to prevent American technology from advancing China’s military power, though the impact might reach further into the industry.