IPOs are back, but for how long?

The first quarter is almost over, and despite Dropbox’s splashy debut on the public market earlier today, it was preceded by just two other U.S. tech companies to IPO in 2018: Cardlytics and Zscaler. 
Will Dropbox turn things around? Will the fact that Spotify is readying its debut get the momentum going at long last?
It all depends on how Dropbox and Spotify perform and how they impact what’s known as the IPO window. When new issuers perform well, it typically swings wide