The grey market premium for the Infinity Infoway IPO has gained since the SME issue opened for subscription last week, after a stellar subscription, which saw the IPO getting booked over 250 times.The grey market premium for the Infinity Infoway IPO has gained since the SME issue opened for subscription last week, after a stellar subscription, which saw the IPO getting booked over 250 times.  Read MoreIPOs ​NDTV Profit