Uber is going public in one of the biggest IPOs of all time as all its execs swarm the NYSE

Uber is going public Friday on the New York Stock Exchange under the ticker symbol “UBER.”The big day kicked off with the traditional bell-ringing ceremony on Friday morning on the NYSE balcony.Here are pictures of Uber's biggest players on opening day, including CEO Dara Khosrowshahi, former CEO Travis Kalanick, and other Uber directors.Visit Business Insider's homepage for more stories.Uber is going public Friday, and will begin trading under the ticker symbol “UBER” later this morning in one of the largest IPOs in US history.The ride-hailing company kicked off its IPO day on the New York Stock Exchange with the traditional bell-ringing ceremony that signals the start of trading for the day.Before the day began, there was already some drama surrounding the ceremony. Controversial former Uber CEO Travis Kalanick reportedly asked the company's current CEO, Dara Khosrowshahi, if he could be on the balcony to help ring in Uber's IPO. However, Khosrowshahi rejected his request, but Kalanick is there on the floor of the NYSE.This is the biggest tech IPO since Facebook in 2012. Uber has an initial valuation of $75.5 billion, and priced its IPO at $45 a share.Here are pictures from Uber's bell-ringing ceremony for its IPO on Friday: