Find the latest IPO GMP, kostak and sauda rates for mainboard and SME IPOs in India. Learn about the grey market, its risks, benefits and tax implications for IPO investors. Track live IPO GMP today in India. Get real-time Grey Market Premium (GMP), Kostak rates, and SME IPO GMP updates. Check estimated listing prices for all active IPOs. The Grey Market Premium, or GMP, is the unofficial premium at which an IPO trades before its official listing. It indicates investor demand and price consensus for upcoming IPOs. Check out the upcoming IPO GMP today with updated rates here.