Actively managed ETFs are growing in popularity. Here's what you want one to look like.

The Gabelli Financial Services Opportunities Fund is an exchange-traded fund that is actively managed. This fund is less than two years old but has performed very well. A list of its holdings and estimates for the fund’s portfolio illustrate why the approach has worked well so far.Most exchange-traded funds are passively managed, which means they track broad indexes, such as the S&P 500 , or they track a market sector or industry groups by basing their portfolios on custom-designed indexes. But actively man ...