ltrashort bond funds are experiencing highs and lows this year.

They racked up a record $24 billion monthly inflow in March. But their fortunes reversed in April. Investors yanked out $1.6 billion. It was the biggest monthly outflow for the category in about two years. Ultrashort bond funds and similar fixed-income investments attract investors seeking a safe haven. They also generate cash and help moderate portfolio risks. So why are investors leaving now? What should you know before adding them to your portfolio?

Morningstar’s ETFInvestor newsletter editor Dan Sotiroff is here to answer that. And the associate director of US passive strategies research will reveal which shorter-term bond ETFs have high ratings from Morningstar.