Here is a look at the top 10 individual equity holdings, as a percentage of assets, that investors, by generation, are tapping through Schwab's brokerage window. (Photo: Shutterstock)

Self-directed brokerage account (SDBA) windows in 401(k)s, long an object of suspicion among regulators, are used by a small minority of plan participants.

Exactly how many plan sponsors build brokerage windows, which give plan participants access to thousands of investment options aside a 401(k)s core menu, varies by recordkeeper.

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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.