Fidelity Investments' corporate 401(k) plans had a record average account balance of $75,200 for the quarter ended June 30, confirmed Beth McHugh, vice president of market insights.
The previous record was $74,900 during the quarter ended March 31, she said in a telephone interview.
Eighty-seven percent of the quarter's increase was because of participants' and employers' contributions, and the rest was due to market gains.
During the quarter, 6.1% of participants increased their contribution rates while 2.7% decreased their rates, according to Fidelity records of participants who made elective deferrals.
Fidelity's review was based on some 17,000 plans, with 11 million participants, for which Fidelity is record keeper. This data excludes plans sold through advisers. Fidelity began tracking account values in 1998.