Turtlemint Fintech IPO GMP: Turtlemint Fintech Solutions’ initial public offering (IPO) is headed for a weak stock market debut, as its grey market premium (GMP) has turned negative in the days leading up to its listing. The IPO, which is scheduled to list on the NSE and the BSE on June 29, is currently trading at a GMP of negative Rs 5, indicating a discounted listing.