Private equity firm TPG has rechristened Poonawalla Housing Finance as Grihum after acquiring 99% equity. Grihum Housing Finance aims to double its business in three years, focusing on the working class segment. With a Rs 3,900 crore deal, TPG has invested Rs 538 crore in the company, which has a net worth of Rs 1,800 crore. The customer base has grown to over 75,000, served by 195 branches. Grihum is positioned to tap into the under-penetrated affordable housing segment, expected to grow faster than the overall housing finance industry.