“401(k) Plan Asset Allocation, Account Balances, and Loan Activity in 2019,” by Sarah Holden, Steven Bass, and Craig Copeland (May 2022, .pdf format, 33p.). Note: EBRI requires free registration to access full-text.
www.ebri.org/content/401(k)-plan-asset-allocation-account-balances-and-loan-activity-in-2019