PALO ALTO, California — The U.S. has finalized rules to restrict certain American investments in mainland China, Hong Kong and Macao in high-tech sectors including artificial intelligence, semiconductors and quantum technology.

The final rules, published by the Department of the Treasury on Monday, prohibit U.S. individuals from making certain transactions related to semiconductors and microelectronics, quantum information technologies and AI, or requires them to notify the Treasury when making such transactions.