The Airbnb logo is displayed on the Nasdaq digital billboard in Times Square in New York on December 10, 2020.Kena Betancur | AFP | Getty ImagesAfter investors spent a decade pouring money into Silicon Valley start-ups so they could keep growing while staying private, the pendulum has completely swung around, and tech IPOs are bigger than ever.Three of the 10 biggest tech IPOs for U.S. companies, in terms of capital raised, have taken place this year. Two happened on consecutive days in the last week, when DoorDash and Airbnb started trading on Dec. 9 and 10. The other was software vendor Snowflake, which had …
