"When the rate environment goes up, we think it may be the most popular fund we have," he said in an interview.

Some of the company's most popular funds have had gruesome declines in the rankings.

Another is a "clone" fund - one nearly identical to a recently closed, popular fund.

Or look at one of the less popular funds, Select Automotive.

All class society popular funds made this bronze colossal.

Unlike many large fund companies, Fidelity has long maintained single fund managers at the majority of its most popular funds.

The increasingly popular funds invest in senior bank loans that rarely trade in any public market.

And in the case of the increasingly popular no-load mutual funds, there are no transaction costs.

Many of the most popular funds closed their doors to new investors.

The most popular funds with investors lately have been those that buy growth stocks, particularly technology companies.