Airbnb Inc. shares more than doubled in their trading debut, propelling the home-rental company to about a $100 billion valuation and one of the biggest first-day rallies on record. The shares closed Thursday at $144.71 up 113% from the $68 initial public offering price. Airbnb Inc. shares more than doubled in their trading debut, propelling the home-rental company to about a $100 billion valuation and one of the biggest first-day rallies on record. While soaring valuations for IPOs give many market veterans pause, Airbnb is at least earning money, unlike 80% of firms that have sold new shares in 2020. The company just reported its most profitable quarter ever.