Flipkart co-founder Sachin Bansal has picked up a majority stake in Bangluru-based microfinance company Chaitanya Rural International Development Services (CRIDS), in what is probably a stepping stone into the broader financial services space for the internet billionaire.Bansal has picked up a majority stake in Chaitanya Rural Intermediation Development Services (CRIDS), a company which runs microfinance institution Chaitanya India Fin Credit (CIFCPL). He will be CRIDS's new chief executive officer (CEO), said a statement by his communications manager. Bansal invested Rs 739 crore, roughly $104 million, in CRIDS: Rs 600 as a primary infusion and the rest in buying out existing shareholders. His exact stake in the company is undisclosed.Bansal is a co-founder of Flipkart, India’s most valued start-up, but sold his shares for $1 billion when Walmart took over the company. Little has been disclosed about his plans for CRIDS, a 10-year-old lender which focuses on rural, low-income customers in Karnataka, Bihar, Maharashtra, Jharkhand, and Uttar Pradesh.Bansal has dabbled in start-ups after leaving Flipkart. He has made debt investments in a variety of ventures like Vogo, Bounce, and Kissht and financing firms Altica Capital and Indostar Capital Finance. Some of these investments are from BACQ, a venture started last year with his IIT-Delhi batch mate, Ankit Agarwal.Bansal’s biggest bet is Ola, where he committed to invest $100 million in January. A source close to the deal said the equity investment is around $25 million, He has over a dozen angel investment from his time at Flipkart and beyond.The Flipkart cofounder will also take over as its chief executive officer