Three mutual fund NFOs are opening for subscription this week. The Aditya Birla SL CRISIL-IBX Financial Services 3-6 Months Debt Index Fund is already open, while the ICICI Prudential Nifty 500 Index Fund and Edelweiss BSE Capital Markets & Insurance ETF will open soon. The Aditya Birla SL fund tracks the CRISIL-IBX Index, aiming to generate returns in line with it, subject to tracking errors.