More than 30 entities, including brokers and high net worth individuals, have come under the scanner of market watchdog, Securities and EXchange Board of India (SEBI) for unusual trading activities on the day of Lok Sabha election results. SEBI sources said, a preliminary enquiry has been initiated to ascertain whether these entities indulged in suspicious transactions on the day of announcement of Lok results. To prevent possible manipulations and excessive volatility in stock trading in the wake of election results, the Securities and Exchange Board of India (Sebi) had made elaborate mechanism to keep a close tab on the market.