Dropbox DBX, +0.00% said in a filing Wednesday morning that it was raising the expected range for its IPO pricing to between $18 and $20 a share. The prior range was between $16 and $18 a share. Reuters reported Monday that demand was strong and that Dropbox's IPO was oversubscribed. Dropbox is expected to price late Thursday and begin trading on Friday. Cloud-based security firm Zscaler Inc. ZS, +7.11% priced its own public offering above its elevated range last week, and shares proceeded to double in their first day of trading Friday. Spotify Technology SPOT, +0.00% is expected to complete its public listing in early April.