The largest defined-contribution-plan record keepers all experienced positive asset growth last year, according to Pensions & Investments' annual record keeper survey.
Bank of America Merrill Lynch, the No. 7 service provider by assets, had the largest year-over-year percentage growth, at just over 18%.
But Fidelity Investments, the leader of the pack, extended its dominance by gaining more than $200 billion in plan assets. Roughly $1.1 trillion now separates the firm from its next-closest competitor.