Retirement nest eggs are climbing back after suffering through the recession. Assets held in retirement accounts rose 18% from a year earlier to $9.3 trillion as of Dec. 31, according to Spectrem Group.

Assets held in defined contribution plans, which include 401(k) plans, rose 19% to $4.5 trillion from a year earlier. As a percentage of all retirement assets, these plans held steady at 49%. By themselves, 401(k) plans, which account for 71% of all defined contribution assets, rose 20% to $2.3 trillion from a year earlier.

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