IPO GMP (IPO Grey Market Premium) measures the price difference between the issue price of an IPO and its trading price in the grey market. Before the launch of a new IPO , trading takes place in an informal manner. G roww IPO GMP Day 1 live updates: The IPO of Billionbrains Garage Ventures Limited, the parent company of investment platform Groww, opens today, November 4, 2025. the price band for the issue ... Check all IPO GMP at one Place . Get insights into the IPO grey market premium for profitable investments. Track the latest IPO Grey Market Premium (GMP) data, trends, and predictions with IPOwiz. Stay ahead with real-time GMP updates for upcoming and ongoing IPOs.