Whether or not to trade in a stock that is under additional surveillance measure or graded surveillance measure depends on various factors, such as the reason for the surveillance, the extent of the restrictions, and the investor's own risk tolerance.
In general, these measures are put in place by the stock exchange to ensure that trading in the stock is conducted in a fair and orderly manner. This can include restrictions on trading volumes, price movements, or trading hours, among others.
Investors should carefully consider the potential risks and benefits of trading in a stock under these measures before making any decisions. It may be wise to consult with a financial advisor or do additional research to understand the specific requirements and restrictions that apply to the stock in question.
Ultimately, the decision to trade in a stock under additional surveillance measure or graded surveillance measure should be based on the individual investor's own analysis and risk appetite.