Husband-wife Asish Mohapatra and Ruchi Kalra's unicorn startup OfBusiness, a supplier of raw materials to small businesses, is in discussions with banks about raising $2 billion in an IPO, Bloomberg reported. At $2 billion, Gurugram-headquartered OfBusiness' IPO could be India's largest tech IPO after Paytm's. While Asish is the CEO of OfBusiness, Kalra has her own unicorn startup Oxyzo.