Bengaluru-based B2B online marketplace Udaan, founded by three former Flipkart executives, has raised $225 million funding from DST Global and Lightspeed Venture Partners to become one of India's fastest billion-dollar startups or a unicorn. The startup has reached a valuation of $1 billion within 26 months of its launch. It was founded by Sujeet Kumar, Vaibhav Gupta and Amod Malviya.