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New data from business intelligence data analytics firm miEdge found that for most companies with up to 1,000 actively enrolled employees, the 401(k) plans with the most in assets under management also have sky-high participation rates.

The miEdge data comes from Form 5500 filings with the U.S. Department of Labor as of July 30. Government entities such as cities, towns and fire and police departments are not required to file and therefore are not reflected in this data. The same applies to church plans, as defined by ERISA.

Additionally, participation percentages for each company include retired or former employees who have left employment with the company, but still have their plans/balances in, accounting for participation rates of more than 100%.