Microfinance portfolio for lenders grew 26 per cent to more than Rs 3.24 lakh crore at the end of the December quarter, an industry body said on Friday. The micro credit portfolio for all the lenders combined together stood at Rs 2.56 lakh crore in the year-ago period, and Rs 3.04 lakh crore at the end of the preceding September quarter, according to data collected by Sa-Dhan, an association of impact finance institutions.