Facebook co-founder and chief executive Mark Zuckerberg rang the Nasdaq's opening bell Friday, flanked by chief operating officer Sheryl Sandberg and Nasdaq chief executive Bob Greifeld.

Zuckerberg opened the tech index trading while outside the company’s headquarters in Menlo Park, Calif., in front of a cheering crowd of Facebook employees on a stage that looked like it was set up for a rock concert.

The 28-year-old Facebook co-founder traded high-fives and hugs with Sandberg and other top executives.

On his own Facebook page, Zuckerberg added this update: “Mark Zuckerberg listed a company on NASDAQ,” tagging Sandberg, vice president of product Chris Cox, chief financial officer David Ebersman, deputy general counsel David Kling and vice president of finance and treasurer Cipora Herman.

According to photos Facebook employees posted on their profile pages, Zuckerberg spoke ahead of the bell-ringing and received a standing ovation from his employees.

Markets opened up on Friday morning, in anticipation of official Facebook trading set to begin at 11 a.m ET

Shares of the company are listed on the market and opened at $38 per share, giving the company a valuation of $104 billion.

That valuation shoots the social network into the short list of the country’s most valuable companies, ahead of Amazon.com ($98 billion), Disney ($78.3 billion) and McDonald’s ($91.7 billion).

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