This year has not been as active on the IPO front as we had initially anticipated in January, but we're now beginning to see activity pick up in the space as of late.

Some significant recent IPOs have included ZoomInfo (Tii:ZI) and Vroom (Tii:VRM) this past month with Warner Music (Tii:WMG) coming in as one of the largest. Warner's stock has performed well since the first day of trading, indicating that although volatility continues to play a central role in the capital markets, there clearly is an appetite for upcoming IPOs. As the U.S. economy continues to reopen and gathers strength in the second half of the year, investors should keep an eye on four sizable IPOs that might occur in the back half of the year. While the exact timing of these debuts remains in flux, the following four companies have each said publicly that they will IPO when market conditions present a favorable opportunity:

• Quicken Loans

• Airbnb

• Postmates

• Asana