Tata Sons Private Ltd will have to soon draw up plans to get listed on the bourses as its bid for de-registration as a core investment company (CIC) has been rejected by the Reserve Bank of India (RBI).Rejection of Tata Sons application for de-registration as a CIC implies that it will continue to be in the list of Non-Banking Finance Companies in the Upper Layer (NBFC-UL), requiring it to list.The RBI NBFC-UL list, released on August 6, had 17 NBFCs, including Tata Sons Pvt Ltd. Then the central bank said inclusion of Tata Sons in the list of NBFC-UL is without prejudice to the…