"Mutual funds continue to be the dominant investment vehicles selected by 401(k) plans, but plans' desires for lower fees and greater flexibility could expand the role of institutional products such as collective trusts, especially among plans with more than $250 million in assets ... Mutual funds accounted for 52.3% of all investment vehicles for plans of all sizes as of Dec. 31, 2011 ... The next most popular investment vehicle was separate accounts, 13.3%; collective trusts, 12.5%; and insurance products, 12.2%."  MORE >>