Shares of D B Realty hit the upper circuit in early trade today after a report said Adani Realty, the luxury residential and commercial property arm of Gautam Adani-led Adani Group, was in advanced talks for a merger with the Mumbai -based realty developer. Late investor Rakesh Jhunjhunwala held 1.9 per cent stake or 50 lakh shares in D B Realty at the end of June quarter. The value of Jhunjhunwala's stake stood at Rs 42.7 crore.