IndiGo to file prospectus for $400 million float next week - sources

By Anshuman Daga and Abhishek Vishnoi SINGAPORE/MUMBAI (Reuters) - India's biggest airline IndiGo is set to file a prospectus next week for a domestic stock market listing, which is expected to raise as much as $400 million, according to three sources with knowledge of the matter. IndiGo, owned by hospitality and travel company InterGlobe Enterprises, is aiming to win approval from India's market regulator in August, before hitting the market later in the year, one of the sources said.