This was the year that dual share classes finally got their wings. The biggest development in years for the open-end fund world is the advent of dual share classes, meaning funds can create ETF shares of mutual funds and vice versa. The concept is far from new: Vanguard until 2023 had a patent on ETF shares of mutual funds, and it launched its first more than 20 years ago. More than 80 asset managers filed this year with the Securities and Exchange Commission for exemptive relief from requirements under t ...