The U.S. Department of Defense on Thursday added nine Chinese companies, including Xiaomi, to a list of companies the agency claims are owned or controlled by the Chinese military. The companies on the list are subject to severe restrictions, including a ban on American investments.

The addition is worrying news for Xiaomi, which recently surpassed Apple (AAPL) to become the third largest smartphone maker in the world, according to market intelligence firm IDC. The company’s shares plunged 10% during morning trading in Hong Kong on Friday.

China’s Foreign Ministry did not immediately respond to a request for comment from CNN Business. But Beijing had previously criticized Washington for its actions and said it would take “necessary steps” to safeguard the interests of Chinese companies.

“CNOOC acts as an aggressor for the People’s Liberation Army to intimidate China’s neighbors,” said Commerce Secretary Wilbur Ross in a statement, referring to the country’s military. His agency stated that CNOOC has harassed and threatened offshore oil and gas exploration in the South China Sea.

CNN Business contacted Xiaomi, CNOOC, Comac and other companies added to the U.S. government’s lists on Thursday, but has yet to receive a response.

The measures are the latest in a series of actions the Trump administration took against Beijing in the weeks leading up to Biden’s inauguration and could complicate U.S.-China relations for the new government.

Before Thursday, the Pentagon had already added 35 Chinese companies to its military list, including chip maker SMIC and technology company Huawei. The Commerce Department also imposed restrictions on many companies. (SMIC has denied having a relationship with the Chinese military, while Huawei has denied several US claims that it poses a national security risk).

The U.S. Department of Defense on Thursday added nine Chinese companies, including Xiaomi, to a list of companies the agency claims are owned or controlled by the Chinese military. The companies on the list are subject to severe restrictions, including a ban on American investments.

The addition is worrying news for Xiaomi, which recently surpassed Apple (AAPL) to become the third largest smartphone maker in the world, according to market intelligence firm IDC. The company’s shares plunged 10% during morning trading in Hong Kong on Friday.

China’s Foreign Ministry did not immediately respond to a request for comment from CNN Business. But Beijing had previously criticized Washington for its actions and said it would take “necessary steps” to safeguard the interests of Chinese companies.

“CNOOC acts as a bully for the People’s Liberation Army to intimidate China’s neighbors,” said Commerce Secretary Wilbur Ross in a statement, referring to the country’s military. His agency said CNOOC has harassed and threatened offshore oil and gas exploration in the South China Sea.

CNN Business contacted Xiaomi, CNOOC, Comac and other companies added to the U.S. government’s lists on Thursday, but has yet to receive a response.

The measures are the latest in a series of actions the Trump administration took against Beijing in the weeks leading up to Biden’s inauguration and could complicate U.S.-China relations for the new government.

Before Thursday, the Pentagon had already added 35 Chinese companies to its military list, including chip maker SMIC and technology company Huawei. The Commerce Department also imposed restrictions on many companies. (SMIC has denied having a relationship with the Chinese military, while Huawei has denied several US claims that it poses a national security risk.)