SEBI has summoned billionaire investor and Aptech chairman Rakesh Jhunjhunwala, his wife and brother in a case of alleged insider trading in shares of the company. The regulator is examining a time period from February 2016 to September 2016, a report said. Jhunjhunwala's wife and brother bought 763,057 shares in Aptech through block deals in 2016, it added.