FYI: Since the birth of the 401(k) in 1978, mutual funds have been the dominant investment choice in defined contribution plans.
ETFs have made some inroads, but for the most part, they represent a very small part of investors’ retirement portfolios. Reasons are varied—part of it is the plan’s structure, part of it is plan sponsors’ comfort with using mutual funds over ETFs, and part of that is the mutual fund industry’s size.
Regards,
Ted
https://www.etf.com/publications/etfr/mutual-funds-vs-etfs-retirement?nopaging=1
