The move by the securities exchange comes after U.S. President Donald Trump, back in November, banned American companies and consumers from investing in 31 outfits that Trump said are owned or controlled by the Chinese military.
US officials have complained that China's ruling Communist Party takes advantage of access to American technology and investment to expand its military, already one of the world's biggest and most heavily armed. Representatives for China Mobile and China Telecom were not immediately available for comment.
"These are the acts of a dying administration and China will probably be content to await President Biden, and more clarity then over the general path of US China relations from the new administration", said Mr Halley.
The Chinese government has accused Washington of misusing national security as an excuse to hamper competition and has warned that Trump's order would hurt US and other investors worldwide.
The stock exchange said on Thursday that it would delist China Telecom, China Mobile and China Unicom Hong Kong, with trading of the companies to be suspended sometime between January 7 and January 11. All three companies said they hadn't received any notification from the NYSE about the delisting.
And the securities regulator will support China's three big telcos to "protect their own rights and interest by means of the law", and believe that they can properly deal with the adverse effects of administrative orders and delisting measures.
Cnooc fell 1.8pc while PetroChina was unchanged.
China's commerce ministry said on Saturday it will take "necessary measures" to safeguard the interests of Chinese companies. Ties between Washington and Beijing have grown increasingly antagonistic over the past year as the world's top two economies sparred over Beijing's handling of the coronavirus outbreak, imposition of a national security law in Hong Kong and rising tensions in the South China Sea.
CNOOC could be most at risk as it's on the Pentagon's list of companies it says are owned or controlled by the Chinese military, according to Bloomberg Intelligence analyst Henik Fung.
A Sinopec spokesperson declined to comment. PetroChina Co. and China Petroleum and Chemical Corp., also known as Sinopec, may also be under threat as the energy sector is crucial to China's military, he said.
According to the Chinese Securities Regulatory Commission (CSRC), the three telecoms had "always adhered to market rules and regulatory requirements" in United States securities markets and were "widely recognised by global investors".