Retirement nest eggs are climbing back after suffering during the recession.

Assets held in retirement accounts rose 18% from a year earlier, to $9.3 trillion at Dec. 31, according to a report Tuesday by Spectrem Group, a Chicago research firm.

Assets held in defined contribution plans, including 401(k) plans, grew 19%, to $4.5 trillion, from a year earlier. These plans' share of all retirement assets held steady at 49%.

Gerald O'Connor, a director at Spectrem, said, "The number of plan participants seeking advice on how to invest their retirement funds has more than doubled since 2008, suggesting some lingering uncertainty."

The proportion of participants saying they would like more advice and assistance with investment decisions rose to 58%, from 26% a year earlier.

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