A press release on Facebook's IPO published on May 17, 2012:
Facebook today announced the pricing of its initial public offering of 421,233,615 shares of its common stock at a price to the public of $38 per share.
The shares are expected to begin trading on the NASDAQ Global Select Market on May 18, 2012, under the symbol "FB." Facebook is offering 180,000,000 shares of Class A common stock and selling stockholders are offering 241,233,615 shares of Class A common stock. Closing of the offering is expected to occur on May 22, 2012, subject to customary closing conditions.
In addition, Facebook and the selling stockholders have granted the underwriters a 30-day option to purchase up to 63,185,042 additional shares of Class A common stock to cover over-allotments, if any.