Mid-cap stocks are again catching investors' fancy. After declining by more than 15 per cent from its peak last year, the S&P BSE Midcap index has turned green. Mutual funds (MFs) made a net investment of around Rs 13,000 crore in the mid-cap space during the last two quarters (July-Dec), whereas the foreign portfolio investors (FIIs/FPIs) were net sellers with around Rs 8,000 crore.