Facebook founder Zuckerberg opens trading at Nasdaq stock market CEO and founder of Facebook, Mark Zuckerberg rings the Nasdaq opening bell outside the company's headquarters in Menlo Park, Calif. Facebook's founder and CEO Mark Zuckerberg rang the opening bell at the Nasdaq stock market Friday, signaling the start of share dealing in the U.S. Later Friday, at 11 a.m. ET, shares of Facebook are expected to begin trading publicly on the Nasdaq market under the symbol "FB" in one of the largest and most watched initial public offerings of stock of recent years. You can track the performance of Facebook's stock price here. Stocks are expected to rise Friday, but major indexes are setting up to close their worst week of the year, while Facebook's debut could help lift battered investor sentiment.