Airbnb and DoorDash are planning to release higher-than-expected valuation ranges for their initial public offerings, in the latest sign of strength in a booming market for new issues.

Airbnb is planning to target a range of around $30 billion to $33 billion—using a fully diluted share count—when the home-rental startup kicks off its investor roadshow Tuesday, according to people familiar with the matter.

DoorDash plans to target a range of around $25 billion to $28 billion on a fully diluted basis ahead of a roadshow expected to begin Monday.