Liftoff Mobile — a potential rival to AppLovin in the mobile advertising tech space — completed an initial public offering Thursday, selling 19 million shares at 23, above its 20 to 22 range. The response highlights investor appetite for new offerings, with the much-anticipated SpaceX IPO expected next week. Shares of quantum computing player Quantinuum climbed as much as 18% in its debut Thursday before retreating. Liftoff stock rose 19.6% to close at 27.51 on the stock market today.