The Kuwait Stock Exchange plans to investigate a report submitted by its general manager on 'doubtful trading' in shares of telecom operator Zain, Al-Qabas has reported, citing bourse officials it didn't identify. 'Intense trading' in shares of Zain took place prior to the announcement of a deal, the newspaper said, without identifying the deal. The bourse report raises questions as to whether some parties benefited from information that hadn't been officially announced, according to Al-Qabas.