About 67 percent of 401(k) plans included proprietary mutual funds in 2013, accounting for almost 28 percent of all plan assets, according to the Investment Company Institute and BrightScope’s most recent research on the defined contribution industry.

The percentage of the smallest plans that offer proprietary funds is virtually the same as with the biggest plans—61.3 percent of plans with $1 million to $10 million in assets offer proprietary funds, compared to 63.1 percent of plans with more than $1 billion in assets.

Proprietary funds’ largest footprint is in plans with $250 million to $500 million, which have the highest percentage: 79 percent of those plans offer proprietary funds, accounting for 38.6 percent of plan assets.

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Nick Thornton

Nick Thornton is a financial writer covering retirement and health care issues for BenefitsPRO and ALM Media. He greatly enjoys learning from the vast minds in the legal, academic, advisory and money management communities when covering the retirement space. He's also written on international marketing trends, financial institution risk management, defense and energy issues, the restaurant industry in New York City, surfing, cigars, rum, travel, and fishing. When not writing, he's pushing into some land or water.