A transaction to purchase securities could be declared null and void if it was the result of a rumour being spread. According to the CISI UAE Financial Rules and Regulations, transactions based on market manipulation, misinformation, or rumors that mislead investors and distort the market are considered invalid.
The integrity of the financial markets depends on transparency and the accuracy of the information that drives trading decisions. Therefore, if a transaction is found to have been influenced by rumors, it could be declared void to maintain fairness and prevent manipulative practices.
Reference: CISI UAE Financial Rules and Regulations - Market Manipulation and Invalid Transactions, Section 6.3.2 (2023).