Hospitality startup OYO is planning to file a draft IPO prospectus in November with a targeted $7-8 billion valuation, potentially in the range of 25-30 times the EBITDA, PTI reported. It may approach its board with the proposal next week. SoftBank, OYO's largest shareholder, has recently engaged with Axis Bank, Goldman Sachs, Jefferies and others to assess market sentiment.