The United States requires the three major EDA companies to cut off supplies to China?

It is reported that the United States plans to restrict the services of the world's top three EDA software suppliers, Synopsys, Cadence and Siemens EDA, to China in order to curb the development of China's advanced process chips. Currently, the sales of these three companies in China have reached US$1 billion and US$550 million, respectively, accounting for 16% and 12% of their respective revenues. Although executives in China said they have not received any notification, the news has caused the stock prices of the two companies to fall sharply.