Pre-retirees who continuously held a 401(k) plan with Fidelity Investments for the past 10 years more than doubled their account balances, according to data released by the Boston fund company on Thursday.

The average account balance for these pre-retirees, aged 55 years or older, rose to $211,300 by the end of the third quarter from $96,000 ten years ago. Pre-retirees with a contribution rate at or above 8% this year showed average balances increasing more than 130% over the past 10 years to $291,700.

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