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Employee Benefit Adviser, in partnership with business intelligence data analytics firm miEdge, lists the top 25 401(k) plans for medium-size businesses in the United States. Companies have between 100 and 1,000 employees, and are ranked by end-of-year net assets.

Plan sponsors include this information in Form 5500 Schedule A data they submit to the Department of Labor. Note: Information provided in these rankings come from the DOL Form 5500 filings reported as of Oct. 31, 2017.