Asset management companies (AMCs), which invest the pooled funds of retail investors in securities, are said to provide more diversification, liquidity, and professional management than individual investors can themselves manage. But a look at the stocks held by 28 asset management companies show that one-third of their assets is invested in only 10 stocks. Their favourite 10 being: RIL, SBI, Bharti, ONGC, ICICI Bank, Infosys, Bhel, L&T, HDFC Bank and HDFC.