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. Studds Accessories IPO GMP today. Find out Studds IPO grey market premium , kostak, subject to sauda rates with expected listing gain. Lenskart IPO GMP: Unlisted shares of Lenskart Solutions Ltd are trading at Rs 465 apiece in the grey market , which is 16.17% premium , indicating strong listing gains for investors. Find the latest IPO GMP, kostak, and subject to rates for mainboard and SME IPOs in India. Learn about the grey market , its risks, and how to participate in IPO discussions.